Kawasaki kx 125 мануал

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Quick Reference Guide
Brakes
••
••
••
••
•
101
Suspension
111
General Information
1
Fuel System
2
3
Cooling System
Engine Top End
4
Engine Right Side
5
Engine Removal/Installation
6
Engine Bottom End/Transmission
7
WheelslTires
8
9
Final Drive
This quick reference guide will assist you in
locating a desired topic or procedure.
• Bend the pages back to match the black tab
of the desired chapter number with the black
tab on the edge at each table of contents
page.
• Refer to the sectional table of contents for
the exact pages to locate the specific topic
required.
12 •
Steering
1
Electrical System
1131
Appendix
1141
Kawasaki
KX125
KX250
Motorcycle
Service Manual
LIST OF AB BREVIATIONS
A
ABOC
AC
ATDC
BBOC
BOC
BTDC
"C
DC
F
"F
ft
9
h
L
ampere(s)
Ib
aher bottom dead center
m
alternating current
min
N
after top dead center
before bottom dead center
bottom dead center
before top dead center
Pa
PS
psi
pounds(s)
meter(s)
minute(s)
newton(s)
pascal(s)
horsepower
pound(s) per SQuare inch
revolution
degree(s) Celsius
,
direct current
farad(s)
degree(s) Fahrenheit
TOC
TIR
top dead center
total indicator reading
V
volt(s)
W
watt(s)
foot, feet
gram(s)
hour(s)
liter(s)
'pm
n
revolution(s) per minute
ohm(s)
Read OWNER'S MANUAL before operating.
Foreword
This manual is designed primarily for use by
trained mechanics in a properly equipped shop .
However, it contains enough detail and basic
information to make it useful to the owner who
desires to perform his own basic maintenance and
repair work. A basic knowledge of mechanics, the
proper use of tools, and workshop procedures must
be understood in order to carry out maintenance and
repair satisfactorily. Whenever the owner has
insufficient experience or doubts his ability to do the
work, all adjustments, maintenance. and repair
should be carried out only by Qualified mechanics .
In order to perform the work efficiently and to
avoid costly mistakes, read the text, thoroughly
familiarize yourself with the procedures before
starting work. and then do the work carefully in a
clean area , Whenever special tools or equipment are
specified. do not use makeshih tools or equipment.
Precision measurements can only be made if the
proper instruments are used. and the use of substi tute tools may adversely affect safe operation .
We recommend that all repairs and scheduled
maintenance be performed in accordance with this
service manual.
To get the longest life out of your Motorcycle :
• Follow the Periodic Maintenance Chart in the
Service Manual.
• Be alert for problems and non-scheduled maintenance .
• Use proper tools and genuine Kawasaki Motorcycle parts. Special tools. gauges. and testers that
are necessary when seNicing Kawasaki Motorcycles are introduced by the Special Tool Manual.
Genuine pans provided as spare pans are listed in
the parts Catalog .
• Follow the procedures in this manual carefully.
Don't take shortcuts.
• Remember to keep complete records of maintenance and repair with dates and any new parts
installed .
How to Use this Manual
In preparing this manual. we divided the product
into its major systems. These systems became the
manual's chapters. All information for a particular
system from adjustment through disassembly and
inspection is located in a single chapter.
The Ouick Reference Guide shows you all of the
product's system and assists in locating their
chapters. Each chapter in turn has its own comprehensive Table of Contents.
The Periodic Maintenance Chart is located in the
General Information chapter. The chart gives a time
schedule for required maintenance operations.
If you want spark plug information. for example,
go to the Periodic Maintenance Chart first. The chart
tells you how frequently to clean and gap the plug.
Next, use the Ouick Reference Guide to locate the
Electrical System chapter. Then, use the Table of
Contents on the first page of the chapter to find the
Spark Plug section .
Whenever you see these WARNING and
CAUTION symbols, heed their instructions! Always
follow safe operating and maintenance practices.
AWARNING
This warning symbol identifies special instruction , or
procedures which. jf not correctly followed. could
r&luh in Pfjrll(tnal injury. or loss of life .
CAUTION
This caution symbol identifies special instructions o r
procedures which, If not strictly observed. could r8ltllt
in dsmage to or destruction of equipment.
This manual contains fOur more symbols (in
addition to WARNING and CAUTION) which will
help you distinguish different types of information.
NOTE
o
This note symbol indicates points of particular interest
mor" efficient and convenient operation.
fOf
• Indicates a procedural step or work to be done.
01 ndicates a procsdural sub-step or how to do the work
of the procedural step it follows. It also precedes the
text of 8 WARNING, CAUTION, or NOTE.
* Indicates a conditional step or what action to take based
on the results of the test or inspection in the procedural
step or sub-step i1 follows.
In most chapters an exploded view illustration of
the system components foHows the Table of
Contents. In these illustrations you will find the
instructions indicating which parts require specified
tightening torque, oil. grease or a locking agent
during assembly.
GENERAL INFORMATION 1 -1
General Information
Table of Contents
Before Servicing ................ ......................................... ............ .......................
...1-2
Model Identification ...........
.................................. ................................................1-4
General Specifications ................................................. .............................................. .1-6
Periodic Maintenance Chart .....................................................................................1-10
Torque and locking Agent ......................................... ...... ....... ............................. ...., -, 1
Special Tools. Sealant ...............................................................................................1 -14
Cable. Harness. Hose Routing ..................................................................................1 -18
1 - 2 GENERAL INFORMATION
Before Servicing
Before starting to service a motorcycle, careful reading of the applicable section is recommended to eliminate
unnecessary work. Photographs, diagrams. notes, cautions, warnings, and detailed descriptions have been
included wherever necessary. Nevertheless, even a detailed account has limitations, a certain amount of basic
knowledge is also required for successful work.
Especially note the following:
(1) Di~
Before removal and disassembly. clean the motorcycle . Any dirt entering the eng ine or other parts will
work as an abrasive and shorten the life of the motorcycle. For the same reason, before installing a new
part, clean off any dust or metal filings.
(2) Tightening Sequence
Generally. when installing a part with several bolts, nuts, or screws, start them all in their holes and
tighten them to a snug fit. Then tighten them evenly in a cross pattern. This is to avoid distortion of the
part and/ or causing gas or oil leakage . Conversely when loosening the bolts, nuts, or screws, first loosen
atl of them by about a quarter of turn and then remove them. Where there is a tightening sequence
indication in this SelVice Manual. the botts, nuts, or screws must be tightened in the order and method
indicated.
(3) Torque
When torque values are given in this SelVice Manual. use them . Either too little or too much torque may
lead to serious damage. Use a good quality, reliable torque wrench.
(4) Force
Common sense should dictate how much force is necessary in assembly and disassembly. If a part seems
especially difficult to remove or install, stop and examine what may be causing the problem . Whenever
tapping is necessary, tap lightly using a wooden or plastic -faced mallet. Use an impact driver for screws
(particularly for the removal of screws held by a locking agent) in order to avoid damaging the screw heads.
(5) Edges
Watch for sharp edges, especially during major engine disassembly and assembly. Protect your hands
with gloves or a piece of thick cloth when lifting the engine or turning it over.
(6) High - Flash Point Solvent
A high-ftash point solvent is recommended to reduce fire danger. A commercial solvent commonty
available in North America is Stoddard solvent (generic name) . Always follow manufacturer and container
directions regarding the use of any solvent.
(7) Gasket, O- Ring
Do not reuse a gasket or O-ring once it has been in selVice. The mating surfaces around the gasket
should be free of foreign maner and perfectly smooth to avoid oil or compression leaks.
(8) Liquid Gasket. Non - Permanent Locking Agent
Follow manufacturer's directions for cleaning and preparing surfaces where these compounds will be
used. Apply sparingly. Excessive amounts may block engine oil passages and cause serious damage. An
example of a non -permanent locking agent commonly available in North America is Loctite Lock' n Seal
(Blue) .
(9) Pross
A part installed using a press or driver, such as a wheel bearing, should first be coated with oil on its outer
or inner circumference so that it will go into place smoothly.
(10) Ball Bearing and Needle Bearing
Do not remove any ball or needle bearings that are pressed in unless it is necessary. If they are removed,
replace them with new ones.
When installing a bearing, press it in with the marked side facing out using a suitable driver until it is
bottomed. Bearings should be pressed into place by pushing evenly the bearing race which is affected by
friction.
(11) Oil Seal and Grease Seal
Replace any oil or grease seals that were removed with new ones, as removal generally damages seals.
When pressing in a seal which has manufacturer's marks, press it in with the marks facing out. Seals
shou ld be pressed into place using a suitable driver, which contacts evenly with the side of seal, until the
face of the seal is even with the end of the hole.
•
GENERAL INFORMATION 1 - 3
(12) Seal Guide
A seal guide is required for certain oil or grease seals during installation to avoid damage to the seal lips.
Before a shaft passes through a seal, apply a linle high temperature grease on the lips to reduce rubber to
metal friction .
(13) Circlip, Retaining Ring
Replace any circtips and retaining rings that were removed with new ones, as removal weakens and
deforms them . When installing circlips and retaining rings, take care to compress or expand them only
enough to install them and no more.
(14) Coner Pin
Replace any coner pins that were removed with new ones, as removal deforms and breaks them.
(15) lubrication
Engine wear is generally at its maximum while the engine is warming up and before all the fubbing
surfaces have an adequate lubricative film . During assembly. oil or grease (whichever is more suitable)
should be applied to any rubbing surface which has lost its lubricative film . Old grease and dirty oil should
be cleaned off. Deteriorated grease has lost its lubricative quality and may contain abrasive foreign panicles.
Don't use just any oil or grease. Some oils and greases in particular should be used only in cenain
applications and may be harmful if used in an application for which they are not intended. This manual
makes reference to molybdenum disulfide grease (MOSl ) in the assembly of cenain engine and chassis
pans. Always check manufacturer recommendations before using such special lubricants.
(16) Electrical Wires
All the electrical wires are either single-color or two-color and. with only a few exceptions, must be
connected to wires of the same color. On any of the two-color wires there is a greater amount of one color
and a lesser amount of a second color, SO a two -color wire is identified by first the primary color and then
the secondary color. For example, a yellow wire with thin red stripes is referred to as a ~yellow/ red " wire;
it would be a Urad/yellow" wire if the colors were reversed to make red the main color.
Wire (cross-section)
Name of Wire Color
Red
Wire Strands
Yellow/ Red
Yellow
Red
(17) Replacement Pans
When there is a replacement instruction, replace these parts with new ones every time they are removed .
These replacement parts will be damaged or lose their original function once removed.
(18) Inspection
When parts have been disassembled, visua lly inspect these parts for the following conditions or other
damage. It there is any doubt as to the condition of them, replace them with new ones.
Abrasion
Crack
Hardening
Warp
Bent
Dent
Scratch
Wear
Color change
Deterioration
Seizure
(19) Specifications
Specification terms are defined as follows:
·Standards" : Show dimensions or performances which brand-new parts or systems have.
·Service Limits": Indicate the usable limits. If the measurement shows excessive wear or deteriorated
performance, replace the damaged parts.
1-4 GENERAL INFORMATION
Model Identification
KX12S-J1 left Side View
KX126-J1 Right Side View
GENERAL INFORMATION 1-5
KX250·Jl Left Side View
KX250·Jl Right Side View
1-6 GENERAL INFORMATION
General Specifications
KX125-J1
Items
Dimensions:
Overall length
Overall width
Overall height
2160 mm
815mm
1 215mm
1470 mm
395mm
Wheelbase
Road clearance
Seal height
950mm
86.5 kg
45.5 kg
48.5 kg
8.5 L
Dry weight
Curb weight:
Front
Rear
Fuel tank capacity
Engine:
Type
Cooling system
Bore and stroke
Displacement
Compression ratio
2·stroke, single cylinder. crankcase reed valve
Liquid -cooled
54.0 )( 54.5 mm
124 mL
Low speed : 9.1 : 1 (E) 8.8 : 1
High speed : 8.1 : 1 (E) 7.8 : 1
29.05 kW (39.5 PS) @11 250 ,/ m;n ('pm)
25.01 N-m (2.55 kg-m. 18.4 ft-Ib) @11.000 rl min (rpm)
Carburetor, KE1HIN PWK36
Maximum horsepower
Maximum torque
Carburetion system
Starting system
Primary kick
Ignition system
Ignition timing
Spark plug
Port timing:
Inlet
COl
Scavenging
Exhaust
Open
Close
Open
Close
Open
Close
Lubrication system (Gasoline: oil)
14. 5° BTDC @ 11000r/ min (rpm)
NGK R6254K· 105 (A) (C) (E) NGK R6252K-105
Full open
65.0- 8BDC
65.0- ABDC
86.0· BBDC (low speed) . 94.5· 8BDC (high speed)
86.0· ABDC (low speed) , 94.5- ABOC (h;gh speed)
Petrol mix (32:1)
Drive Train:
Primary reduction system:
Clutch type
Transmission :
Type
Gear
Reduction ratio
3.500 (56/ 16)
Type
Gear ratios:
Wet, multi disc
6 -speed, constant mesh, return shift
1st
2nd
3n1
4th
5th
6th
Final drive system:
Overall drive ratio
Transm ission oil:
Type
Reduction ratio
Grade
Viscosity
Capacity
2.142
1.714
1 .400
1.181
1.041
0.920
(30/ 14)
(24/14)
(28/20)
(26/ 22)
(25/ 24)
(23/ 25)
Chain drive
4.083 (49/ 12)
13.148 @Topgear
SE class
SAE 10W30 or 10W40
0.7 L
(Continued on next page.)
GENERAL INFORMATION 1 -7
Items
KX,25-J'
Frame:
Type
Steering angle
Caster (rake angle)
Trail
Front tire:
Rear tire:
Tubular, semi -double cradle
45' to either side
25.5-
105 mm
Make/ Type
Size
Make/ Type
Size
Front suspension:
Rear suspension:
Brake type:
Effective disc diameter:
Type
Wheel travel
Type
Wheel travel
Front and Rear
Front
Rear
DUNLOP K490 (E) DUNLOP 0752. Tube type
80/ ,00 - 2'5'M
DUNLOP <695 (E) DUNLOP 0752. Tube type
'00/ 90 - '957M
Telescopic fork ( up side down )
310mm
Swing arm (Uni -trak)
330mm
Single disc
220mm
190 mm
Specifications subject to change without notice, and may not apply to every country.
(A) : Australian model
( C) : Canadian model
(E) : European model
1-8 GENERAL INFORMATION
KX250-J1
Items
Dimensions:
2185 mm
Overall length
Overall width
Overall height
Wheelbase
Road clearance
815mm
1 215mm
1490 mm
385mm
Seat height
955mm
Dry weight
Curb weight:
96.5 kg
50 kg
52 kg
8.5 L
Front
Rear
Fuel tank capacity
Engine:
Type
2 -stroke, single cylinder. piston reed valve
Cooling system
Liquid -cooled
66.4 )( 72.0 mm
249mL
10.9 : 1 (low speed). 9.3 : 1 (h;gh speed)
39.4 kW (53.6 PS ) @8 500 r/ m;n (rpm)
49.0 N-m (5.0 kg -m, 36 ft-Ib) @7 500 rl min (rpm)
Bore and stroke
Displacement
Compression ratio
Maximum horsepower
Maximum torque
Carburetion system
Starting system
Ignition system
Ignition timing
Sparl< plug
Port timing:
Carburetor, KEIHIN PWK38
Primary kick
COl
14" BTOC @6 000 r/ min (rpm)
NGK R6254E-9 (A) (C) (E) NGK R6252E -9
Inlet
Scavenging
Open
Close
Open
Exhaust
Close
Open
Close
Lubrication system (Gasoline: oil)
Full open
61 .0"
61 .0"
80.5"
80.5"
880C
A80C
880C (low speed) . 92.5" 880C (h;gh speed)
A80C (low speed) .92.5" A8DC (h;gh speed)
Petrol mix (32:1)
Drive Train:
Primary reduction system:
Clutch type
Transmission :
Type
Gear
Reduction ratio
2.750 (55/ 20)
Type
Gear ratios:
Wet. multi disc
5 -speed. constant mesh. return shift
1st
2nd
3rd
4th
5th
Final drive system :
Overall drive ratio
Transmission oil:
2.133
1.687
1.388
1.136
1.000
(32/ 15)
(27/ 16)
(25/ 18)
(25/ 22)
(24/ 24)
Type
Chain drive
Reduction ratio
3.500 (49/ 14)
Grade
Viscosity
Capacity
9.625 @Top gear
SE class
SAE 10W30 or 10W40
0.85 L
(Continued on next page.)
GENERAL INFORMATION 1-9
KX250-J1
Items
Frame:
Type
Steering angle
Caster (rake angle)
Trail
Front tire :
Make/ Type
Size
Rear tire:
Make!Type
Size
Front suspension :
Type
Type
Wheel travel
Front and Rear
Tubular, semi -double cradle
45· to either side
26108 mm
DUNLOP K490 (El 0752. Tube type
80/ 1oo- 2151M
DUNLOP K695 (El 0752. Tube type
110/ 90-1962M
Telescopic fork (up side down)
310mm
Swing arm (Uni -trak)
330mm
Single disc
Front
Rear
190mm
Wheel travel
Rear suspension:
Brake type:
Effective disc diameter:
220mm
Specifications subject to change without notice, and may not apply to every country.
(A) : Australian Model
(C) : Canadian Model
(E) : European Model
1-10 GENERAL INFORMATION
Periodic Maintenance Chart
The maintenance must be done in accordance with this chart to keep the motorcycle in good runn ing
cond it ion.
FREQUEN CY
Each
Every
Every
race
3 races
5 races
•
R
Every
As
10 races required
OPE RATION
•
Clutch adjust
Clutch and friction plates- check f
•
Throttle cable - ad' ust
Spark plug
•
•
•
clean. gap f
A ir cleaner element - clean
A ir cleaner element - replace
Carburetor
w
z
z
w
"
inspect/ adjust
Transmission oil
change
Piston and piston ring clean / check f
Cylinder head, cylinder and exhaust valves
MuHler cleanl check f
Silencer packing - change
inspect
Small end bearing - check f
Kick pedal and shift pedal
clean
Exhaust pipe O-ring - replace
Engine sprocket c heck f
check f
Radiator hoses, connectio ns - check
Coolant
Brake a.d justment - check f
Brake wear check f
Brake flu id level check f
Brake flu id -c hange
Brake master cylinder cup and dust seal - replace
Brake caliper piston seal and dust seal replace
Brake hose replace
Spoke tightness and rim runout - check f
Drive chain adjust
Drive chain lubricate
Drive chain wear - check f
<n
<n Chain slipper and guide - replace
<n
Front fork inspect/clean
:I:
u Front fork o il change
Nuts, bolts, fasteners - check f
Fuel system clean
Fuel hose-replace
Steering play - check f
Steering stem bearing , grease
Rear sprocket check f
General lubrication lubricate
Wheel bearing check f
Swing arm and Uni -Trak linkage pivots grease
Swing arm and Uni -Trak linkage pivots check f
Rear shock oil replace
f . Replace, add, adJUSt. clean or torque If necessary.
R : RepJace
"
R
If damaged
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
R
•
Every
Every
Every
Every
2
2
2
4
years
years
years
years
•
If damaged
I
1 st time after 2 races, then every 5 races
•
I
I
I
I
I
Every 4 years
•
•
•
•
•
1 st time after 2 races, then every 5 races
GENERAL INFORMATION 1-11
Torque and Locking Agent
Tighten all bolts and nuts to the proper torque using an accurate torque wrench. If insufficiently tightened, a
bolt or nut may become damaged, strip an internal thread, or break and then fallout. The following table lists
the tightening torque for the maj or bolts and nuts, and the parts requiring use of a non -permanent locking agent
or liquid gasket.
When checking the tightening torque of the bolts and nuts, first loosen the bolt or nut by half a turn and then
tighten to specified torque.
lener used in the .. Remarks ~ column mean:
l
Apply a non -perman8fl1 locking agent 10 the threads.
lG Apply liquid gaskello the threads.
S
Tighten the faslen9fS follow ing the specified sequence.
Torque
Fastener
Remarks
N-m
kg - m
ft -Ib
Fuel System :
Rear Frame Mounting Bolts
Carburetor Holder Mounting Bolts
26
8.8
2.7
0.9
19.5
78 in-Ib
Cooling System :
Water Pump Impeller Bolt
Coolant Drain Plug (Water Pump Cover)
(Cylinder)
6.9
8.8
22
0.7
0.9
2.2
61 tn -Ib
78 in -Ib
Engine Top End :
Cylinder Head Nuts
Spark Plug
Coolant Drain Plug (Cylinder)
Cylinder Nuts
(KX125)
25
27
22
25
18.0
20.0
16.0
18.0
25
25
26
8.3
7.8
2.5
2.8
2.2
2.5
3.5
3.5
2.7
0.85
0.8
22
15
3.9
8.8
2.2
1.5
0.4
0.9
35 in -Ib
78 in- Ib
22
9.3
8.8
98
2.2
0.95
0.9
10
82 in-Ib
78 in -Ib
72
3.9
8.3
7.8
6.9
8.8
9.8
49
59
0.4
0.85
0.8
0.7
0.9
1.0
5.0
6.0
(KX250)
Engine Bracket Mounting Nuts (Engine Side)
(Frame Side)
Shaft Lever Nut
(KX125)
(KX250)
34
34
16.0
19.5
74 in -Ib
69 in -Ib
Operating Rod Left Side Plug
(KX125)
(KX250)
Main Lever Mounting Allen Bolt (10(125)
Main Shaft Nut (10(125)
Engine Right Side :
External Shift Mechanism
Return Spring Pin
Clutch Spring Bolts (KX125)
(KX250)
Clutch Hub Nut
Exhaust Valve Advancer
Lever Mounting Allen Bolts
Shaft Lever Nut
(KX125)
(KX250)
Water pump impeller Bolt
Kick Ratchet Gu ide Bolt
Kick Pedal Bolt
(KX125)
Kick Pedal Nut
(KX250)
Primary Gear Nut (KX125)
16.0
"
16.0
35
74
69
61
78
87
in -Ib
in -Ib
in -Ib
in-Ib
in -Ib
in -Ib
36
43
left -hand
threads
L
1 -12 GENERAL INFORMATION
Torque
Fastener
Remarks
N-m
kg · m
ft-Ib
34
3.5
25
34
26
98
3.5
2.7
10.0
25
19.5
8.8
20
5.4
8.8
8.8
22
22
78
0.9
2.0
0.55
0.9
0.9
2.2
2.2
8.0
78 in-Ib
54
9.3
98
25
5.5
0.95
10.0
2.5
Not less
than 1.5
Not less
than 0.15
Not less
than 13 in - Ib
Final Drive:
Rear Axle Nut
Rear Sprocket Nuts
98
29
10
3.0
72
Brakes:
Caliper Mounting Bolts (Front. Rear)
Brake Hose Banjo Bolts
Front Master Cylinder Clamp Bolts
Brake Disc Mounting Screws (Front. Rear)
Caliper Bleed Valves (Front. Rear)
Brake Pedal Mounting Bolt
Brake Pad Bolts
25
25
8.8
9.8
7.8
8.8
18
2.5
2.5
0.9
1.0
0.8
0.9
1.8
18.0
18.0
22
20
54
29
2.25
2.0
5.5
3.0
16.3
28
2.85
20.6
98
39
81
81
81
81
10.0
4.0
8.3
8.3
8.3
8.3
29
60
60
60
60
Engine Removal/Installation :
Engine Mounting Nuts
Engine Bracket Nuts:
Engine Side
Frame Side
Swing Arm Pivot Shaft Nut
Engine Bottom End/Transmission :
Crankcase Bolts
Transmission Oil Drain Plug
Output Shaft Bearing Retaining Bolts
Drive Shaft Bearing Retaining Bolts
Shift Drum Bearing Retaining Bolts
Shift Drum Operating Plate Bolt
Flywheel Bolt (KXl 25)
Flywheel Nut (KX250)
Wheels/Tires:
Front Axle
Front Axle Clamp Nuts
Rear Axle Nut
Rear Caliper Mounting Bolts
Spoke Nipple
Suspension :
Front Fork Clamp Bolts
(Upper)
( Lower)
Front Fork Cylinder Valve Assembly
Front Fork Top Plug
Push Rod Nut
Swing Arm Pivot Shaft Nut
Rear Shock Absorber Mounting Bolts
Tie-Rod Mounting Nut (Front. Rear)
Rocker Arm Bracket Mounting Bolts
Rocker Arm Pivot Nut
Rear Shock Absorber Bracket Mounting Bolts
72
14.5
48 in - Ib
78 in-Ib
78 in - Ib
16.0
16.0
58
40
82 in-Ib
72
18.0
22
78
87
69
78
in -Ib
in- Ib
in- Ib
in- Ib
S
, 3.0
14.5
40
22
72
l
GENERAL INFORMATION 1-13
Torque
Fastener
Remarks
N -m
kg-m
ft-Ib
78
3.9
25
8.0
0.4
2.5
35 in-Ib
22
20
2.25
2.0
14.5
22
78
27
2.2
8.0
2.8
15.0
58
20.0
Steering:
Steering Stem Head Nut
Steering Stem Locknut
Handlebar Clamp Bolts
Front Fork Clamp Bolts
(Upper)
(lower)
Elect rical Sys t em:
Flywheel Bolt (KX125)
Flywheel Nut (KX250)
Spark Plug
The lable below, relating tightening torque to thread
diameter. lisls the basic torque for the bolts and nuts. Use
this table for only the bolts and nuts which do not require
a specific torque value. AU of Ihe values are for use with
dry solvent-cleaned threads.
58
18.0
16.3
General Fasteners
Torque
Threads dia.
(mm)
N-m
kg -m
ft -Ib
5
6
8
3.4-4.9
5.9 -7.8
14-19
0.35-0.50
0.60-0.80
30-43 in-Ib
52 -69 in -Ib
1.4-1 .9
10
12
1.
16
18
20
25-34
2.6-3.5
44 -61
4.5-6.2
7.4-10.0
11.5-16.0
17-23
23-33
10.0 -13.5
19.0-25
33-45
73 -98
115 -155
165-225
225-325
54-72
83-115
125 -165
165-240
1-14 GENERAL INFORMATION
Special Tools. Sealant
Spark Plug Wrench, Hal( 21 : 57001 -110
Inside Circlip Pliers: 57001 -143
Piston Ring Pliers: 57001 -' 1 5
Outside Circlip Pliers: 5700' · '44
Fuel level Gauge- 57001 -122
Bearing Puller: 57001 - 158
kr
G~
c
I
~
~
'-' --- ;:J
r
Bearing Puller Adapter. 57001 -136
Compression Gauge: 57001- 221
Steering Slem Bearing Driver. 57001 -137
Flywheel Puller: 5700' -252
GENERAL INFORMATION 1 -15
Kick Shaft Oil Seal Guide" 57001 - 263
Bead Breaker Assembly: 57001 -1072
Shih Shah 0 11 Seal Guide" 57001-264
Steermg Stem Bearing Driver Adapter. 57001 -1074
Piston Pin Puller Assembly: 57001 -910
Head Pipe Outer Race Press Shah: 57001 ·1075
o
o
o
Hand Tester (V. O. M ) : 57001 - 983
Head Pipe Outer Race Driver: 57001 -1076
Rim Protector: 57001 · '063
Head Pipe Outer Race Driver. 57001 -1077
1-1 6 GENERAL INFORMATION
•
Crank.case Splining Tool Assembly: 57001 - '098
Compression Gauge Adapter, M14)( 1.25: 57001 -1159
Steering Stem Nut Wrench: 57001 -1100
Crankshaft Jig: 57001-1174
Hook Wrench: 57001 - 1101
Jack: 57001 -'238
Head Pipe Outer Race Driver: 57001 -1106
Clutch Holder: 57001 -1243
Bearing Driver Set: 57001 - 1129
Fork Spring Holder: 57001 -1286
GENERAL INFORMATION 1 -17
Fork Cylinder Holder: 57001 -'287
Pressure Cable Luber: k5601 -9021
FoOt Piston Rod Pulier, M12 x 1.25: 57001-1289
Kawasaki Bond (liquid Gasket - Silver) : 92104 -002
Fork Oil Level Gauge: 57001 -'290
Flywheel Holder. 57001-1313
Fork Oil Seal Driver, $43: 57001 -1340
1-18 GENERAL INFORMATION
Cable. Harness. Hose Routing
( Front View)
,
Clutch Cable
TlnoUla Cable
Engine Stop Switch Lead
Band
Clamp
( Right Side View)
~---- Engine Stop Button lead
Band (Make
a bundle of engine
slop switch lead wlr• .)
Ignition Coil
A - - - - Clutch Cabla ( KX125)
~~~ij~~~~~==~ radiator
Clamp on the right
Mount the Ignilion coli with
Ignlt.r ground and engine atop .wltch ground.
~~3=={G;l
Jr------- Ri9ht
Radiator
;~~r--------- Run lhe c lutch cable inside the right radiator.
( left Side View )
Throttle
Se. Right Side View
Clamp on the
Igniter
- ---.:'l>It-...
Band ifeslen the throttle
eabl_ and leads ,)
l eft Radiator -----''''1\(1
Carburetor
Magnato Stator Lead (A )
Run the lead Inside tha
left radiator.
--..,.,.
Magneto Stator lead IAI
Clutch Cable (8) ---~'<7
( KX250)
Cable (8) ( KX250)
tRun the clutch cable behind
the leh radi ator lower hose.'
To Magneto
Band
GENERAL INFORMATION 1-19
Radiator
Breather Hose - - -\
Brake
Hose
Left Fork
Tube
Caliper
Clamp
Run the brake hOle inside
the left fork tube .
Brake
Hose
Left Fork
Tube
Right Air Vent Hose
Carburetor
Rear Shock Absorber
Breather Hose
(Crankcase)
---~~;;;~
Overflow Hose
Clamp
[)
Clamp
FUEl SYSTEM 2-1
Fuel System
Table of Contents
Exploded View................
................................................................................... 2-2
Specifications
.......................................................................... .... ..... 2-4
Throttle Grip and Cable ............................................ .............................................2-5
Free Play Inspection
.........................................................................................2-5
Free Play Adjustment..
............
.........................................................2-5
Installation Notes ....
.......................................................
. .. 2-6
Cable Lubrication
.................................... ................................................. 2-6
Cable Inspection ..... ............. ..........................
.. ... 2-6
Carburetor .
........ ................ ...................................
............... 2- 7
Idle Speed Inspection .
.................................
.. ............................... 2-7
Idle Speed Adjustment
..............................................................................2 -7
Service Fuel Level Inspection .............................................................................2 -7
Service Fuel Level Adjustment .....................
.. ..................................................2-8
Removal ...........................................................
.................... ........................ 2-9
Installation Notes ...............................
.............................................2-10
Fuel Inspection ................................................
..2-10
Disassembly . ................................ ...............
.. ........................ 2-' 1
Assembly Notes ..................... ,... ,...................
...................
..2-12
.. .....................................................................................2-' 2
Cleaning ................
Inspection ............................. ,................................. .................
.. ....... 2 -12
.. ..... 2-14
Air Cleaner
.................
............. ............................
Housing Removal ..
,....................
.................
......... 2 - 14
.. .................. 2-14
Housing Installation Notes .............. ............. .......................
Element Removal .....................
.............
.. ............................ 2-14
Installation Note
.................................................
.. ....... 2-14
Element Cleaning and Inspection .... ,...... .............................
.. ............... 2-14
Fuel Tank
................
.................... ...............
.. ....... 2 - 16
Removal .................. ,...........
...............
................................. ,........... 2-16
Installation Notes
.. ,...........
.. ....... 2-16
Fuel Tap Removal. ............
.. .....................................................................2-16
Fuel Tap Installation Notes............... ................................................
........ 2-16
Fuel Tap Inspection ....
................................
.. ....... 2-17
Fuel Tank and Tap Cleaning ....
..................
.. ............................. 2-17
Reed Valve
....................................... .............
.......... 2-18
Removal.............. ............
.............................................
.. ..................2-18
Installation Note ...............
............................ ,......... .2-18
Inspection .................
.......................................... ................
.. ....... 2 - 18
2-2 FUEL SYSTEM
Exploded View
KX250:
~~~
L
- - -
1 _______ _ -,
I
I
_____ _
KX125 :
___ L____ -,
I
I
I
I
I
I
,
,
I
,
10
I
, __ ___ ____ _ .J
L
1. Throttle cable
2. Throttle Grip
3. Carbur.tot Holder
50<'' '
••
5. Connector
4.
Retainer
7. Jet Needle CUp
8.
9,
10.
11 .
Jet Needle
ThroHie Valve
Choke Knob
ktkl Adjusting Screw
12. locknut
13. Air Screw
14. Slow Jet
15.
16.
17.
18.
Float Valve Needle
Main Jet
Float
Reed Valve
Apply 011
: Apply gre ...
o :
G
T1 : 8.8 N·m (0.9 kg-m, 78 In-Ib)
T2 : 1.0 Nom (0.10 kg-m, Sin-Ib)
FUEL SYSTE M 2-3
Tl
G
Tl
1. Fuel Tank cap
2. Fuel Tank
3 Fuel Tap
I
HOWl ng
4.. Air C'-aner
...
5. Element
6. Frame
7 Holder
. Air Cleaner Duct
8.
•
9 Rear Fram
G : Apply greaaeoam-alr titter 011
o : H~h-qu.llty I m 19.5 ft.lb)
T1 : 28 N-m (2.7 kg- ,
2· 4 FUEL SYSTEM
Specifications
KX125 :
Standard
Item
Throttle grip free play
Carburetor:
Make/type
Main jet
Throttle valve cutaway
Jet needle
J et needle clip position
Slow jet
A ir screw
Service fuel level
Main air jet
Float height
2 .... 3mm
KEIHIN PWK36
#158
#5
NORG
3rd groove from the top
# 48
1% (turns out)
2 mm above - 0 mm below
the float bowl mating surface
# 200
16 ±2 mrn
Service Limit
-----
-----
-------------
Air Cleaner:
High -quality foam -air fitter oil
Element oil
Reed Valve :
Reed warp
---
--O.2mm
KX250 :
Standard
Item
Service Limit
2 _ 3mrn
---
KEI H IN PWK38
# 162
#7
NOLB
3rd groove from the top
# 58
1 % (turns out)
2 mm above - 0 mm below
the float bowl mating furtaee
# 200
16 ±2 mm
---------------
Air Cleaner:
Element oil
High -Quality foam -air f ilter oil
---
Reed Valve :
Reed warp
---
Throttle grip free play
Carburetor:
Make/type
Main jet
Throttle valve cutaway
Jet needle
Jet needle clip position
Slow jet
Air screw
Service fuel level
Main air jet
Float height
Special Too. -
Fuel level Geuge, M18 x 1.0: 57001 -122
Preuur. C.bJe Luber: k5601.9021
---
---
O.2mm
FUEL SYSTEM 2-5
Throttle Grip a nd Cable
If the throttle grip has excessive free play due to cable stretch or
mlsadJustmenl. there will be a delay in throttle response. Also, the
throttle valve may not open fully at full thronle. On the other hand, if the
throttle grip has no play, the throttle will be hard to control, and the Klle
speed w ill be erratic. Check the throttle grip play periodically in accord ance with the Perlochc Maintenance Chart. and adjust the play if
necessary.
The throttle cable routing is shown in Cable, Harness, Hose Routing
in the Generallnformallon chapter.
Free Play Inspection
. Check thrOllle gnp free play [ Bj by lightly turning the throttle grip
[Aj back and forth.
* If the free play is improper, adjust the throttle cable.
Throttle Grip Free Play
Standard:
2 - 3 mm
Free Play Adjustment
• loosen the locknut [Aj .
• Turn the adjuster [Bj until the proper amount of throttle grip free play
is obtained .
• Tighten the locknut.
* If the throttle grip free play cannot be adjusted with the adjuster at the
upper end of the throttle cable use the cable adjuster [Aj at the
carburetor.
o Pull the boot off of the carburetor top. Make the necessary free play
adjustment at the lower cable adjuster, tighten the locknut [8], and
install the boot.
. Turn the handlebar from side to side w hile idling the engine. If idle
speed varies, the throttle cable may be poorly routed or it may be
damaged.
Operation with an Improperly .ctlusled, Ir1cof"rectly routed,
damaged cable could r-nult In an unsafe riding condltton.
2-6 FUEL SYSTEM
Installation Notes
• Install the throttle cable in accordance with the Cable, Harness, Hose
Routing section in the Generallnformalion chapter.
• Aher the installation, adjust each cable propet'ly.
i .. WARNING
Operation with an Incorrectly routed or Improperly adJusted cable
could result In an unsate riding condition.
Cable Lubrication
Whenever the cable is removed, and in accordance with the Periodic
Maintenance Chan (see General Information chapter), do t he following .
• Applya thin coating 01 grease [AJ to the cable upper end.
A
. lubricate the cable [A] with a penetrating rust inhibitor.
Special Tool - Pre•• ur. cable Luber: K56019-021 ( B}
Cable Inspection
. With the throttle cable [AJ disconnected at both ends, the cable
should move freely within the cable housing.
* If cable movement is not 'ree after lubricating, jf the cable is frayed, or
if the housing is kinked, replace the cable.
FUEL SYSTEM 2-7
Carburetor
Smce the carburetor regulates and mixes the fuel and air going to th e
engine. there are two general types of carburetor trouble: 100 rich a
mixture (too much fuel), and too lean a mixture (too hnle fuel) Such
trouble can be caused by d irt. wear, maladjustment, or Improper fuel level
In the float chamber A du1Y or damaged au cleaner can also aller the fuel
to air ral l0.
Idle Speed Inspection
. Start the engine and warm It up thoroughly.
• With the engine Idling. turn the handlebar to both sides.
* 11 handlebar movement
be Improperly adjusted
Be sure to correct any
Harness, Hose Routing
changes the Idle speed, the throttle cable may
or Incorrectly routed, or it may be damaged.
of these condit ions before riding (see Cable,
In the General Information chapter).
damaged ca b le could result In an unsafe riding condition.
e Check idle speed.
* Adjust it as needed .
Idle Speed Adjustment
• First turn In the air screw (AJ until It seals lightly, and back it outl%
turns.
e Start the engine and warm it up thoroughly.
e Loosen the locknut [C) and turn the idle adjusting screw [B] to obtain
desired idle speed. II no idle is preferred. turn out the screw until the
engine stops.
e Aher adjustment, tighten the locknut.
e Open and close the throttle a few times to make sure that the idle
speed IS as desired. Readjust II necessary.
Service Fue/ Leve/lnspection
.... WARNING
Gasoline Is extremery nammable and can be e.p*lve under certatn
concIHk>ns. Always stop the engine and do not smote. Make sure the
area. well ventilated and free from any source of Ilame or spartts;
this Includes any appliance with a pilot light.
e Tum the fuel tap 10 the OFF position.
e Rem ove the luel tank..
e Remove the carburetor, and hold it in true vertical posilion on a stand.
The fuel hose and carburetor cable do not have to be removed to
inspect the fuel level.
e Put the fuel tank on a bench, and connect the luellap to the carburetor
using a suitable hose.
e Remove the drain plug Irom the bottom of the floal bowl, and screw
a luellevel gauge [A] into the plug hole.
Speclal Toot - Fuel Level Gauge: 57001·122 (A]
2-8 FUEL SYSTEM
• Hold the gauge venically against the side of the carburetor body so
that the ·zero· line is several millimeters higher than the bottom edge
of the carburetor body.
• Turn the fuel tap to the ON position to feed fuel to the carburetor.
e Wait until the fuel level in the gauge settles.
• Keeping the gauge vertical, slowly lower the gauge until the · zero· line
is even with the bottom edge of the carburetor body.
NOTE
000 not lower the "zero" line below the bonom edge of the
carburetor body. If the gauge is lowered and then raised Bgain, the
luellevel measure shows somewhat higher than the actual fuel level.
1/ the gauge is lowered too far, dump the fuel out of it into a sunable
containBf and stan the pfocedur8 over again .
• Read the fuel level ( B] in the gauge and compare it to the specification.
Service Fuel Level
Standard: 2 mm above _ 0 mm below 1M no.t bowl maUng .urtace
* If the fuel level is incorrect. adjust it.
eTum the fuel tap to the OFF position and remove the fuel level gauge.
elnstall the drain plug on the bottom of the float bowl.
Service Fuel Level Adjustment
J~ WARN1NG
GaIlOIIne .e.u.n.e!)' flemmable.nd can be e.pklalve under certain
condltlont. AIw.y••top the englne.nd do not .moke. Make .urethe
are. II w.1I ventilated and f,.. from .ny IIOUI'Ce of flame or .parb;
"II Includ. . . ny appU.nce with a pilot light
eRemove the carburetor, and drain the fuel into a suitable container.
e Remol$ the float bowl.
eDrive out the pivot pin fA] and remOl$ the float [8J.
eBend the tang [AJ on the float arm very slightly to change the float
height. Increasing the float height lowers the fuel level and decreasing
the float height raises the fuel level.
FUEL SYSTEM 2-9
.Measure the float height tilting the carburetor so thai the tang on the
float just touches the needle rod in the f loat valve.
Float Height
Standard:
16 ±2 mm
1. Float Bowl Mating Surface 4. Float Height
2. Needle Rod
5. Float Valve
3. Float
. Assemble the carburetor, and recheck the fuel leveL
*11 the fuel level cannot be adjusted bV this method, the float or the float
valve is d amaged.
Removal
i~WARNING
Gasoline Is •• tremely flammable and can be elCplollve under certain
condilion • . Always stop the anglne and do not.make. Make eur. the
are. Is wen ventilated and fr •• from any soun:e of flame or ..,am;
ttl .. Includes any appliance with • pilot HghL
.Tum the fuel tap to the OFF position and pull the fuel hose off the tap .
• l oosen the clamps [AJ. and remove the carburetor from the end of the
air cleaner duct. and then pull it out of the carburetor holder.
eDrain the fuel from the flost bowl by remove the drain plug . After
draining , install the drain plug securely.
eUnscrew the carburetor cap AI. and pull out the throttle valve
assembly (BI.
" the throt1la valva Is not removed from the cable, wrap It In a cllian
cloth to avoid damaga.
• After removing the carburetor, push a clean, lint-free towel into the
carburetor holder and the air cleaner duct to keep din or other foreign
material from entering.
" dirt Of" dust Is allowed to pan through Into the carburetor, the
throftla may become studt, poulbly causing an accldenL
CAIITlON
" dirt gets through Into the engine, excenlve engine waar and
possibly engine damage will occur.
c
2-10 FUEL SYSTEM
Installation Notes
e Being careful not to bend or otherwise damage the jet needle. Check
to see that the throttle valve (Al goes all the way down into the
carburetor body, and slides smoothly .
• When installing the carburetor into the carburetor holder. align the
center [AJ of the carburetor with the groove [8] on the holder.
.Route the air vent and overflow hoses properly (see Cable, Harness,
Hose Routing in the General Information chapter) .
Always keep the hoSes tree 04 ~tructlon , and make aur. they do
not get pInc:hed by 1M eNln or thOctI: at.ofber.
e After installing the carburetor, do the following.
O Tum the fuel tap to the ON position, and check for fuel leakage from
the carburetor.
O Adjust the following items if necessary.
Throttle Cable
Idle Speed
Fuel Inspection
nWARNING
a.lOline Is extremely flammable and can be expao.lve under certa.,.
condIUon •. Always atop the engine and do not amotl:a. Make ture'"
ar.... well ventilated and free trom any source of tlame Of' apa;rb;
Itt .. Includes any appliance with a pilot I~l
. Tum the fuel tap to the OFF position .
• Remove the carburetor.
• Remove the drain plug [AJ trom the bottom ot the float bowl and
check for water or dirt in the tuel.
*If any water or dirt comes out, clean the carburetor, fuel tap and fuel
tank (see Fuel Tank) .
• Install the drain plug on the float bowl, and tighten it securely.
• Install the carburetor.
FUEL SYSTEM 2-11
Disassembly
• Remove the carburetor.
• Remove the throttle valve assembly rAJ, spring [a]. relainer
[el and
carburetor cap from the carburetor cable lower end .
• Dlsassemble the throttle valve assembly; connector rAJ, Jel needle
with circlip [B) and throttle valve [C].
©-
-- [email protected]
1
I
. Remove the choke knob/ staner plunger assembly [A] from the
carburetor.
• Remove the following parts from the carburetor body.
A. Idle Adjusting Screw
B. l ocknut
C. Air Screw
D. Spring
E. Slow Jet
F. Main Jet
G. Float Valve Needle
H. Float
I. Pin
J. O -ring
K. Float Bowl
2-12 FUEL SYSTEM
Assembly Notes
. Clean the disassembly pans before assembling.
• Replace the float bowl O-ring with a new one if it is deteriorated or
damaged.
• Tum in the air screw (AJ fully but not tightlY, and then back It out' %
turns.
Cleaning
~'WARNING
w.' . .
Clean the carburetof' In a
nnlllated area, and taka care that
there Is no apark Of flame anywhere near the wortdng ar•• ; this
InckKlea any appliance with • plk)t light Because of the danger of
hlghty flammable liquids, do not u•• gasoline Of' low Ilaalt-point
solvent to clean the carburetor.
• Make sure the fuel tap is in the OFF position.
• Remove the carburetor.
• Drain the fuel in the carburetor.
• Disassemble the carburetor.
CAlJT10N
Do not u.. compreued air on an . ...mbled carburetor, the float
may be defonned by the pres.ure.
Remove as man)' rubber or plastic partl from the carburetor • •
possible befofe clunlng the carburetor with • cleaning solution.
This will prevent dlimllge or deterlor. non of the partl.
Do not use ••trong carburetor cleaning aokttlon which could attack
the plastic parts; Instead, UN a mild high Ilash-point cleaning
solution ..Ie fOf plastic: parts.
Do not us. wlr. or any other hard Instrument to clean carburetor
parts, ..peelalty Jets, as tlwty may be damaged .
•
•
•
•
•
Immerse all the metal parts in a carburetor Cleaning solution.
Rinse the parts in water.
After the parts are cleaned, dry them with compressed air.
Blow through the air and fuel passages with compressed air.
Assemble the carburetor, and install it on the motorcycle.
Inspection
nWARNING
Guollne is axtNm.ty flammable and can be explosive under certain
conditions. AlwaV- atop Ihe engine and do not smoke. Make !lUre the
area Ie wen-ventilated and tree from any source of flam. or apart.;
this Inctudu any appltance with a pilot light
FUEL SYSTEM 2-13
e Remove the carburetor.
e Before dlSassembhng the carburetor, check th e fuel level (see Fuel
Level InspectIon) .
*If the fuel level
IS Incorrect. inspect the rest of the carburetor before
it .
• Pull the carburetor cable to check that the throttle valve moves
smoothlv and returns by spring pressure
.. If the throttle valve does nol move smoothly. Replace the carburetor.
• Clean the carburetor.
COfrE!Cllng
• Remove the float valve needle.
• Check the float valve needle [Al for wear.
* 11 the needle IS worn as shown tight ( B] , replace the valve needle.
• Push the rod [el in the valve needle, then release it.
* II the rod does not come Qut fully by spring tension, replace the valve
needle.
• Remove the slow Jet
. Check the slow jet for any damage.
* If the slow jet is damaged. replace it wit h a new one.
• Remove the thronle valve and Jet needle.
• 'nspect the outside of the thronle valve for scraTches and abnormal
wear.
* 1' it is badly scratched or worn, replace the throWe valve.
• Inspect the inside of the carburetor body for these same faults.
* If it is badly scratched or worn, replace the entire carburetor .
• Check the jet needle for wear.
* A worn jet needle should be replaced.
• Disassemble the carburetor, and clean the fuel and air passages with
a high flash-point solvent and compressed air.
A
2-14 FUEL SYSTEM
Air Cleaner
Housing Removal
• Loosen the air deaner duct clamp .
• Remove:
Side Covers
Seat
Silencer
Rear Fender
Rear flap
Rear Frame
• Remove the air cleaner housing.
Housing Installation Notes
eTorque the rear frame mounting bolts [ AJ .
Torque - Rear Frame Mounting Bolts: 26 N-m (2.7 kg-m, 19.5 ft-Ib)
Element Removal
• Remove the seat
• Remove the wing bolt [A) and pull Qut the element [ 8 J.
• Stuff 8 clean, lim-free towel into the carburetor so no d irt is allowed
to enter the carburetor.
e Wipe out the inside of the air cleaner housing with a clean damp towel.
CAIITlON
Check Inside Ihe InJet Ir8ct and carburetor for dirt "dirt Ia prltMnt,
cle.n 1M IntaKe trect and carburetor thoroughly. You rna,. also nHd
to replace the element and ...1the housing and Inlet tract.
Installation Note
e When installing the element, coat the lip of the element with 8 thick
layer of all purpose grease (A] to assure a complete seal against the
air cleaner element base. Also, coat the base where the lip of the
element fits .
• Apply grease 10 all connections and screw holes in the air cleaner
housing and intake tract.
Element Cleaning and Inspection
NOTE
O ln dusty ar68S, the elern"nt should btl cI"aned mor" frequently than
rtICommended intBfVal.
OAfter riding through rain or on muddy roeds, the el"",ent should be
clesned immediately.
OSinCtl rep68ted cleBning opens the pores of the element. replace ft
with a nl!W one in accordsnce wfth the Periodic Maintenance Chart.
Also, if there is a break in the element material or any other damage
to the element. replace the el"",ent with a new one.
FUEL SYSTEM 2-15
,i,.WARNING
Clean the element In II wen·ventllated area, and take car. that ,...,.
are no sparka or flame anywhere near the wot1clng a,•• ; thlslncluct.
any appliance with II pilot light
Because of the danger of highly flammable liquids, do not UN
gasoline or II low flaah-90int .olvent to clean the element
• Remove th e air cleaner element, and separate Ihe element [A] from the
frame [B].
e Clean the element in a bath of a high flash -point solvent using a soft
bristle bnJsh. Squeeze it dry in II clean towel. Do not wring the
element or blow it dry; the element can be damaged .
• Check all the parts of the element for visible damage,
If any part of the element is damaged, replace it.
. After cleaning, saturate the element with II high .quality foam-a ir-filter
oil, squeeze out the excess, then wrap it in II clean rag and squeeze it
*
as dry as possible. Be careful not to tear the sponge filter .
• Assemble the element.
• Remolle the towel from the carburetor.
• Install th e element.
2-16 FUEL SYSTEM
Fuel Tank
Removal
.nWARNING
Gasoline Is extremely flammable and can be axploslv. under certain
conditions. Atwaya stop the engine and do not amok•. Make sur. the
ar•• Is well venmated and Iree 'rom any source of flama or sparta;
this klctudes any appliance with • pilot light
a Remove:
Side Covers
Seat
Radiator Covers
a Tum the fuel tap to the OFF position.
• Pull the fuel hose off the fuel tap.
• Remove the fuel tank mounting bolts [Al .
• Remove the fuel tank [8).
• Drain the fuel tank.
Installation Notes
a Ched: the rubber dampers [A] on the frame and fuel tank.
* If the dampers are damaged or deteriorated, replace them.
• Be sure the fuel hose is clamped to the fuel tap to prevent leaks.
Fuel Tap Removal
. Remove the fuel tank and drain it.
eRemove the mounting bolts (A) and take out the fuel tap [B] .
Fuel TBp Installation Notes
• Be sure the O· ring is in good condition to prevent leaks.
• Be sure to clamp the fuel hose to the tap to prevent leaks.
I
FUEL SYSTEM 2-17
Fuel Tap Inspection
.Remove the fuel tap .
• Check the fuel tap filter screen [ 8 ] for any breaks or deterioration.
* If the fuel tap screen have any breaks or deterioration, it may allow dirt
to reach the carburetor, causing poor running. Replace the fuel tap.
* If the fuel tap leaks, or allows fuel to flow when it is at OFF poSition.
replace the damaged O-ring [A].
Fuel Tank and Tap Cleaning
,..WARNING
Clean the tank In a well-ventilaled area, and take car. that there is
no lpartta or lIame anywhere ne.r the working artls. Because of the
danger of highly flammable liquids, do not us. gasoline or low
flas~lnt solvent to clean the "nk.
• Remove the fuel tank and drain it.
. Pour some high flash -point solvent Into the fuel tank and shake the
tank to remove dirt and fuel depoSits .
• Pour the solvent Qut of the tank .
• Remove the fuel tap from the tank by takmg ou t the bolts.
• Clean the fuel tap filter screen in a high f lash-point soillent.
. Pour high flash -point solwnt t hrough the tap in alileller posit ions.
• Dry t he tank and tap with compressed air.
• Install the tap in the tank .
• Install the fuel tank.
2-1a FUEL SYSTEM
Reed Valve
Removal
• Remove the carburetor from the carburetor holder and air clean er d uct.
• Remove the mounting bolts, and take off the carburetor holder.
e Talo:.e the reed valve (A] out of the cylinder (8] .
• For KX125 model; remove the reed valve (A] from the crankcase [ C].
Installation Note
. Torque the carburetor holder mounting bolts [A],
Torque - Carburetor Holder Mounting Botts: 8.8 N-m (0.9 kg-m, 711lrHbJ
Inspection
e lnspect the reeds for cracks, folds, or other visible damage.
* If there is any doubt as to the condition of a reed, replace the reed valve
pan with a new one.
* If a reed becomes wavy, replace the valve part with a new one even if
its warp is less than the service limit.
• Measure the clearance between the reed [A) and holder [B], and
check the reed warp as shown.
If anyone of the clearance measurements exceeds the service limit,
replace the valve part with a new one.
*
RHdWrap
Sel'Vice Limit
0.2 mm
COOLING SYSTEM 3-1
Cooling System
Table of Contents
Exploded View ......... ..... "" ... " ...... "" ......................................................................... 3·2
Specifications .............
............................................................... .......... ... ... .. .3-4
Coolant .... ............... ............... ..................
....................................................3-5
Coolant Inspection ..................................................................................................3-5
Coolant Level
............. ................... .................................
................. 3-5
Coolant Deterioration ........................................................................................3-5
Coolant Change ..... ................ ....................................... ................
.. ......... 3-6
Coolant Draining ............................................................................................ 3-6
Coolant Filling ....... .................
.....................................................................3-6
Air Bleeding ............................................................................................................3- 7
Cooling System Pressure Testing ........................................................................... 3-7
Cooling System Flushing .......................................................................................3-8
Disassembly and Assembly Precautions ....... ..........................................................3-9
Water Pump ................. .................
..............
.. ....................................... 3-'0
Cover Removal ......................................................................................................3-, 0
Cover Installation Notes ........ ..................... .......... ........................................... 3-10
Impeller Removal ..................................................................................................3-1 0
Impeller Installation Note .....................................................................................3-'0
Impeller Inspection .............................................................................................3-11
Shaft Removal ......................................................................................................3-'1
Shaft Installation Note ..... ............... .............
.. ........................................ 3-11
Oil Seal Removal. ............ ............... ............. .....................
.................... 3-1 1
Oil Seal Installation
............... ..............
................................................3-1 1
Radiator ..................
.. ....................................................3-13
Removal .......................................................... ....................
.................... 3-13
Installation Note.......... .........................
.. .....................................................3-13
Inspection ...........................................
...............
.. .... 3-13
Cap Inspection ................................................................
.. .... 3-13
Filler Neck Inspection ...................................
.............
........... 3 -14
Cooling Hoses, Breather Hose Inspection ................... ..............
.. ......... 3-14
3-2 COOLING SYSTEM
Exploded View
KX125:
11
'2
1. Radlelor'
2. Radletor Cap
3. Waler Pump Cover
4. Drain Plug
5. Impelle,
9. Waler Pump Ge.r
10. Righi Engine Cover
6. 011 Seal (Shor1)
" . Cylinder Head
7. 011 Seal (Long)
12. Cylinder
8. Be.ring
G : Apply gre •••
T1 : 8.8 Nom (0.9 kg-m, 78 In·lb)
T2 : 6.9 N-m (0.7 kg-m, 61 In-Ib)
COOLING SYSTEM 3-3
KX250 :
3
1. Radiator
2. RadialOf' Cap
7. all Seal (L
8. Bearing ong)
3. Water Pum
9. Water P
10
ump
. Righi Engine Co
11.0.11nder Head ...
12. Cylinder
4. Drain Plug P Cover
5. Impel",
8. 011 Seal (Short)
~! . ~lInder Drain Plug
G ..
Fitting
T1 . ppl)' grea••
12 :.• S.8N...rn(09
7 In-Jb)
6.9 N-m (0.7 kg""" ,8
n .. 22 N-m (2 2.kg-m611
,
n-Ibl
. kg-rn, 16.0 ft·lbl
:aw
3-4 COOLING SYSTEM
Specifications
Standard
Item
Coolant :
Type
Color
Permanent type of antifreeze for aluminum engines
and radiators
Green
Mixed ratio
Soft water 50%, coolant 50%
Total amount : KX125
KX250
O.93L
Cap relief pressure
95 - 125 kPa
1.1L
Radiator:
(0.95 - 1.25 kg/ cm2 , 14 - 18 psi)
Special Tool - Bearmg Driver Set: 57001·1129
COOLING SYSTEM 3-5
Coolant
Check the coolant level each day before riding the motorcycle, and
replenish coolant If the level IS low . Change the coolant In accordance
with the PeriodiC Maintenance Chart (see the General Information
chapter).
.-..WARNING
To avoid burns. do nol remove the radlalor cap or try to Inspect the
coolanttevel or change Ihe cootant when the engine Is stili hot Wall
until II cools down.
Coolant Inspection
Coolant level:
NOTE
o Check the level when
the engine is cold (room or ambient temper·
ature) .
• Situate the motorcycle so that
• Remove the radiator cap [A].
11 IS
perpendicular to the ground .
NOTE
O Remove the radiator cap in two steps. First turn the cap counterclockwise to the first stop and wait there fOf a few seconds. Then
push down and turn it further In the S8me direction and remove the
cap .
• Check the coolant level. The coolant level [A] should be at the bottom
of the filler neck.
If the coolant level is low, add coolant through the filler opening to the
bottom of the filler neck. Install the cap.
*
Recommended coolant
Permanent type ot antttreeze (soft waler and ethylene glycol plus
corros~ and rust Inhibitor chemicals for aluminum englnal ancl
radiators)
Water and coolant mixture rallo:
1:1 (Water SO"l., CoolantSO·/.)
Total amount
KX125 : 0 .93 L
KX25O : 1.1 L
Coolant Deterioration:
. Visually inspect the old coolant.
*If whitish cotton -like wafts are observed, aluminum parts in the
cooling system are corroded. If Ihe coolant is brown, iron or steel parts
are rusting. In either case, flush the cooling system.
If the coolant gives off an abnormal smell, check for a cooling system
leak. II may be caused by exhaust gas leaking into the cooling system.
*
A
3-6 COOLING SYSTEM
Coolant Change
The coolant should be changed periodically to ensure long anglne life.
Coolant Draining:
i .. WARNING
Coolant on tires will make them at1ppery and can cau. e an accident
and Injury. Immediately w~ up Of wash away any coolant that spills
on the trame, engine or other painted parts. Since coolant Is harmful
to the human body, do not use lor drinking .
• Remove the righ t radiator cover .
• Remove the radiator cap.
NOTE
QRemove the radiator cap in two steps. First turn the cap counterclockwise to the first stop and wait there for a few seconds. Then
push down and turn it further in the same direction and remove the
cap .
• Place a container under the coolant drain plug (KX125) [A1 or plugs
(KX250) (B]. and drai n the coolant from the radiator and engine b y
removing the drain plug on the wa ter pump cover and the cvlinder
(KX250) . Immediately wipe or wash ou t any coolan t that spills on t he
frame, engine, or wheel .
• Inspect the old coolant for visual evidence of co"osion and abnonnal
smell (see Coolant Deterioration) .
Coolant Filling:
Use coolant conlllkling cot"f'o.lon Inhlblton made spec:"ally for
aklmlnum .nglnes and radiators In accordance with the instruction
of the manufacture'a. Soft Of' dlslllled waler musl be used with the
.nlifr••z. (... below for antifreez.) In the cooling system. "hard
weter Is used In the s,..tem, "cau..s scale accumulation In the water
pauag.., and conskJerably reduc.. the efficiency of the cooling
oyslom.
Coolant
Type
Permanent type .nlH....z.
lor aluminum engln.. and
r.dlators
Colo<
Mixed raHo
G_
Softwalersoe;. ,
CoolantSO%
Freezing point
- 35"C ( - 31"F)
Total amount
KX125 ! 0.93 L
KX250 : 1.1 L
COOLING SYSTEM 3-7
e lnstallthe drain plug.
o Replace the gasket with a new one.
Torque - Coolant Drain Plug on Water Pump Co ver: 8.8 Nom (0.9 kg-m,
78In·lb)
Coolant Drain Plug o n Cylinder (KX250); 22 N·m (2.2 kg-m ,
'6.0 tt.fb)
• Fill the radiator up to the bottom of the radiator filler neck with coolant
rA), and install the cap, turning it clockwise about % lurn.
NOTE
O POUf in the coolant slowly so that it can expel the air from the engine
and radiator. The radiator cap must be installed in two steps. First
turn the cap clockwise to the first stop. Then push down on it and
tum it the rest of the way.
• Check the cooling system for leaks.
e lnstall the right radiator cap.
Air Bleeding
Before putting the motorcycle into operation. any air trapped in the
cooling system must be removed as follows .
• Start the engine, warm up the engine thoroughly, and t hen stop the
engine. Wait until the engine cools down.
• Remove the right radiator cover and radiator cap .
• Check the coolanlleveL
* If the coolant level is low, add coolant up to the bottom of the filler
neck.
• Install the radiator cap .
• Check the cooling system for leaks .
• Install the right radiator cover.
Cooling System Pressure Testing
CAlITlON
During pressure testing, do not exceed the pressure for which Ihe
system Is designed to work. The maximum pressure Is 125 kPa (1.25
kgfcm 2 , 18 psi).
• Remove the right radiator cover.
• Remove the radiator cap, and install a coating system pressure tester
[A] and adapter ( 8 ) on the radiator filler neck.
NOTE
o Wet
the adapter cap sealing surfaces with water or coolant to
prevent pressure leaks .
• Build up pressure in the system carefully until the pressure reaches 125
kPa (1.25 kg / cm 2 , 18 psi) .
• Watch the gauge for at least 6 seconds. If t he pressure holds steady,
the cooling system is all right.
. Remove the pressure taster, replenish the coolant, and install the
radiator cap.
* It the pressure drops and no extemal source is found, check for intemal
leaks. Check the cylinder head gasket for leaks.
""
~

--,
"" J~
3-8 COOLING SYSTEM
Cooling System Flushing
Over a period of time, the cooling system accumulates rust. scale, and
lime in the water jackel and rad iator. When this accumulation is
suspected or observed, flush the cooling system. If this accumulat ion is
not removed, it will clog up the water passages and considerably reduce
the efficiency of the cooling system.
• Drain the cooling system.
• Fill the cooling system with fresh water mixed w ith a fl ushing
compound.
CAUTlON
Avoid the use of a flushing compound which Is harmful to the
aluminum engine and radiator. Carefutly lollow the Instructions
supplied by the manufacture of the cleaning product.
. Warm up the engine, and run it at normal operating temperature for
about ten minutes.
e Stop the engine. and d rain the cooling system after the coolant cools
down .
• Fill the system with fresh water.
. Warm up the engine and drain the system aher the coolant cools
down.
• Repeat the previous two steps once more.
• Fill the system with a permanent type coolan t, and bleed the air from
the system (see Air Bleeding) .
COOLING SYSTEM 3-9
Disassembly and Assembly Precautions
• Prior to disassembly of cooling system parts (radiator, pump, etc), wall
until the coolanl cools down, and then drain the coolant.
. After assembling and filling the system with coolant, bleed any air from
the system.
3 -10 COOLING SYSTEM
Water Pump
Cover Removal
• Drain the coolant (see Coolant Draining) .
• Loosen the cooling hose clamps, and disconnect the coolmg hoses
on the water pump cover.
• Remove the cover bolts [AJ , and remove the water pump cover {B ].
Cover Installation Notes
• Replace the pump cover gasket with 8 new one.
• Fill the cooling system (see Coolant Filling) ,
• Bleed the air from the cooling system.
Impeller Removal
e Orain the coolant (see Coolant Draining) .
• Remove the cover bolts and take out the water pump cover from the
right engine cover with the water hoses anached .
• Remove the impeller bolt [AJ , and take out the impeller [8] and
washer.
Impeller Installation Note
. Torque the impeller bolt.
Torque - Impeller Bolt: 6.9 N-m (0.7 kg-m, 61 In-Ib)
COOLING SYSTEM 3-11
Impeller Inspection
. Visually check the impeller [AJ,
* If the surface
IS corroded, or If th e blades ( 8 ] are damaged, replace the
Impeller.
Shaft Removal
• Remove:
Impeller
Right Engine Cover
. Pull out the water pump shah [ Al toward inside of the right engine
cover.
Shaft Installation Note
e To prevent the oil seal lips from peeling, apply a molybdenum disulfide
grease to the water pump shaft [AJ and insert It Into the 011 seals [8]
from the inSide of the right engine cover [C] .
CAUTlON
Be sur. to apply a molybdenum disulfide greaa. 10 the water pump
shaft when Installing. If It Ia Installed dry, the ••• Is may wear
exceuively.
Marked Side
Oil Seal Removal
• Remove:
Impeller
Right Engine Cover
Water Pump Shaft
. Insen a bar Into the water pump shaft hole from the outside of the right
engine cover, and remove the ball bearing by tapping evenly around
the bearin g inner race .
• Insert a bar into the water pump shaft hole from the inside of the right
engine cover, and remove the oil seal by tapping evenly around the seal
lips.
Oil Seal Installation
CAUTlON
" the 011 .eal or ball bearing
new on.. at the same time.
}s
• Be sure to replace the oil seals.
removed, replace both 01 them with
3-12 COOLING SYSTEM
. Apply plenty of high temperature grease to the oil seal lips [AJ .
• Press the oil seals [8] into the hole from the outside of the right Cflgine
co",".
Speclal Tool - B•• rlng Driver Set: 57001-1129
[e l
_ Set the oil seal (thick) so that dual lips side face outward and set the
oil seal (thin) so that a lip faces outward as shown.
NOTE
OUss a btJaring driver Isrger in diameter than the oil S881, Bnd press the
oil stNJl into the hole until the edge 01 (he oil seal is located 0.5 mm
[OJ in 'rom the surface of the hole.
• Press the ball bearing imo the hole until the bearing is bottomed
against the step [E).
Special Tool - a •• rlng Driver Set 57001·1129
COOLING SYSTEM 3-13
Radiator
Removal
•
•
•
•
Remove the radiator coverts) .
Drain the coolant (see Coolant Draining) .
Loosen the hose clamps, and pull off the cooling and breather hoses.
Remove t he mounting bolts [A] , and take out the radiator (B].
Installation Note
. Route the cooling and breather hoses correctly.
Inspection
• Check the radiator core.
* If there are obstructions to air flow, remove them.
* tf the corrugated fins are deformed. carefully straighten them with the
thin blade of a screwdriver [A].
CAI1T1ON
Do not tear the radiator rubes while straightening the fins.
* If the air passages of the radiator core are blocked more than 20% by
unremovable o bstructions or irreparably deformed fins, replace the
radiator with a new one.
CAI1T1ON
When cleaning the radiator wlltl compressed air, be careful of ltIe
following to aVOid damage to the IIns.
Keep the air nozzle oyer 0.5 m (20 In.) away from the radiator.
Blow air perpendk:ularly to the radiator core.
Never blow air at an angle against ltIe fins but atralghl1hrough them
In ltIe direction of narural air flow .
Never shake the air nozzle al a right angle agaln. tltle fins, be sure
10 move It at a le'l8 with the fins.
Cap Inspection
. Check the con dit ion of the valve spring (A], and the top and bottom
valve seals [8] of the rad iator cap.
* If anyone of t hem shows visible damage, replace the cap.
( perpendicular)
OK
more than
O.5m
B
3 -14 COOLING SYSTEM
. Wet the top and bottom valve seals with water or coolant to prevent
pressure leaks .
• Install the cap [A] on a cooling system pressure tester [8] .
• Watching the pressure gauge, pump the tester to build up the test
pressure. The cap must open at the specified relief pressure (the gauge
hand flicks down) .
Radiator Cap ReHel Preslure:
Standard:
95 - 125 kPa (0.95 - 1.25 kg/cm 2 , 14 - 18 psi)
OAlso, the cap must hold the relief pressure for at least 6 seconds.
* If the cap cannot hold the pressure, or if the relief pressure is too high
or too low, replace the cap with a new one.
Filler Neck Inspection
• Check the radialor filler neck for signs of damage .
• Check the condition of the top and bottom sealing seats [A) in the
filler neck. They must be smooth and clean for the radialor cap to
function properly.
Cooling Hoses. Breather Hose Inspection
e ln accordance with the Periodic Maintenance Chart. visually inspect
the hoses for signs of deterioration. Squeeze the hose. A hose should
not be hard and brittle, nor should it be soh or swollen.
e Replace any damaged hose.
Cooling Hoses. Breather Hose Installation Notes
e lnstall the oooIing hoses fA} or br8ath8' hose [ B} being careful to follow
the prefol'lned bends (see Exploded VeN and Cable, Harness. Hose
Rooting in the General Information chapter). Avoid sharp bending.1Onking.
flattening, 01' twisting.
e Tlghten the hose clamps securety.
ENGINE TOP END 4-1
Engine Top End
Table of Contents
Exploded View .... .. .... ......... ................. ... ...... ..... .... ..... .... ..... ..... ........................ .. ... .....4-2
Specifications ..
....... ..... ,," ".......................................................................4-4
Cylinder Head ..................... ....... .. ...................... .......... ............. ............. ........ ............4-5
Cylinder Compression Measurement .............................................. ...........................4-5
Removal ............................................... .................... ............ .......................... ......4-5
Installation Notes ......... ....... .................
....................... .................................4~6
Warp Inspection ... ........ .. ... ...... ........... ...... ..... .............. ...... . ..... ............... .. ... ..........4-6
Cylinder, Piston .............................................................................................................4-7
Cylinder Removal .. .. ............ ........... .. ... ...... .... .... .. .... ..... ................... .... . ...... ..........4-7
Cylinder Installation Notes .. .... ..... ..... ..... .......... ..........................................................4· 7
Piston Removal ...........................................................................................•........ .... .4-7
Piston Installation Notes
.. ..... ..... .... .... ... ... ...
. ........................ ..4·8
Cylinder Wear Inspection ...................................................................................... ... .4-9
Piston Diameter Measurement .. . ... ....... ......... ............
.... .... ..... ... .. ....... ..4-9
Piston/ Cylinder Clearance .......................................................................................4 -1 0
Piston Ring, Piston Ring Groove Inspection ... ... .... ..... .... .... ..... ....
. ....... ..4-1 0
Piston Ring End Gap Inspection ...... ...... ......... ..... ...... ........... ..................................4·11
Piston, Piston Pin. Connecting Roo Wear Inspection ........................... .. ....... ... ..... ..4-11
Exhaust Valve (KIPS) ................. ............ ................................ ...................................4-12
Removal ....................... ........... .............. ................................................ ...... ....... ....4- 12
Installation Notes .......................................... .... ......... ........ .... .... ..........................4·14
Muffler (Expansion Chamber, Silencer) ...... ............................................. ............ ........4-19
Removal ..... ............. ..... ............. ........... ......... ...... ...... .. ...
. ................................4· 19
Installation Notes. ........ ... ..... ... ..........
.... ........... .............
..............4-19
Silencer Packing Change ............................................ ......................... ..................4-19
4-2 ENGINE TOP ENO
Exploded View
.
KX1 25:
threads
5
,..........
1 __
1~_
~~
~_Rod
8. Ext-..I Vafve (lAI)
7. ExMuII Valve (RJctIO
. .,...,.
& """""
...
14. Main l..eYer
,~
18. MM'I ExMuII Valve
(Righi)
17. Mm ExhMIII Valve
(Aft)
18. vUe HokIIIr
11. ....... e.tw..tV. .
(5maI)
,~~
20. ...
11. 11* Gt;w
21. MUI Valve Rod Cover
22. MM Valve Rod
"" ..........
24. Man Valve Gear
25. MM-i ShIll Cover
26. " " " ' ' Xl, p-.on Ring
2lI. _
_.......
29. "R" Marti
30. Am:M mull Pl*'II
31. PIMon PWI
32. "-""" """"'"'
33. Rubber SeIII
,.,34. GaokoI
-.
0 : Apply 24'dta . . . . oK.
M : Appty mofybdeI un dIIuIIde
T1
12
1'3
T4
: 27 Nom (2.8 kg-nt, 20 ...,)
: 2& N-m (2.7 kg-m,19.5 1-1))
: 34 Nom (3.S kg-m, 25 ...)
: 25 Nom (2.5 kg-m, 18.0 N:I)
T5 : 15 N-m '1 .5 kg-m. 11 ,0 ft -Ibl
T6 : B.8 N-m (0 .9 kg -m, 78 In-Ibl
T7 : 3.9 N-m 10.4 kg -m. 35 in-Ibl
ENGINE TOP END 4 -3
KX 250 :
o
1..........
2. EngN Bnlckec
3. CyInter Head
•
4. ey..~_Rod
14. Valve Holder
XI, RIA:ItIer Seal
28.
-.
a.et
15. PIn
16. Main Exf1IIUIt Valve
17. Ebow FIlIng
1 ShaI: Laver
a.
29. _
M : Apply moIybdarun diII.AM
o : Appty 2...n&e enghe oil.
6. ExhBuIt Valve (l.BIt)
7. ExhauIl Va..... (R1(tIt)
19. Pkib'I Rhil
20. _
n : 'Z1 Nom (2.8 kQ-m, 20 ...,)
a """""
21 .
22.
23.
24.
2:5.
26.
T2
13
T4
T5
T&
T7
........
10.
O-R~
11. kilt Gear
13. Me'" Exhaust Valve Cover
"R" Martt
ArreNt m.IIt poW tDwatd be front.
PIAon
~
Reed Valve
cartuetor Holder
ExpenskJn Qamber
:
:
:
:
:
:
26 Nom (2.7 kg-m. 19.5"")
34 N-m (3.5 kD-m. 25 &-II)
25 N-m (2.5 kg-m., 18 ...,)
22 N-m (2.2 kg-m, 16.0...,)
15 Nom (1.5 kg-m, 11 .0 ft.I)
8.8 N-m (0.9 kg-m, 78 In-I))
4-4 ENGINE TOP END
Specifications
10(125 :
~.m
Cylinder Head:
Cylinder compression
Cylinder head warp
Cylinder. Piston:
Cylinder inside diameter
Piston diameter
Piston/ cylinder clearance
Piston ring/ groove clearance
Piston ring groove width
PISton ring thickness
Piston ring end gap
Piston pin diametef
Piston pin hole diameter
Small end inside diameter
Service Limit
Standard
(usable range)
770 ... , 200 kPa
(7.7 - 12.0 kg/em'. 109 - 171 ~)
---
--0.03 mm
54.000 _ 54.015 mm
54.11 mm
53.926 ... 53.941 mm
0.069 ... 0.079 mm
0.04 ... 0.08 mm
1.03 ... 1.05 mm
0.97 ... 0.99 mm
0.35 - 0.55 mm
15.995 - 16.000 mm
16.000 _ 16.020 mm
21 .003 _ 21.Q14 mm
53.78 mm
--0.18 mm
1.10 mm
0.90 mm
O.90mm
15.96mm
16.07 mm
21.05 mm
KX250 :
~.m
Cylinder Head:
Cylinder compression
Cylinder head warp
Service limit
Standard
(usable .. nge)
840 - 1 300 kPa
(8.4 - 13.0 kg /em'. "9 - 185
---
--~)
O.03mm
Cylinder. Piston :
Cylinder inside diameter
Piston diameter
Piston/ cylinder clearance
Piston ring /groove clearance
Piston ring groove width
Piston ring thickness
Piston ring end gap
Piston pin diameter
Piston pin hole diameter
Small end inside diameter
Special 10061 -
66.400 - 66.415 mm
66.323 - 66.338 mm
0.072 - 0.082 mm
0.04 - 0.08 mm
1.23 - 1.25 mm
1.17 ... 1.19 mm
0.25 - 0.45 mm
17.995 _ 18.0CXl mm
18.0CXl - 18.020 mm
22.003 _ 22.012 mm
Piston Ahg PIiera; 57001-115
Compreuion Gauge: 57001-221
PiIkln ~ PuIIf .... mbty: 57001.$1 0
CompraaIon Gauge AdIIp(er, M14 x US: 57001-1159
66.48mm
66.17 mm
--0.18 mm
1.30 mm
1.10 mm
0.75 mm
17.96mm
18.07 rrm
22.05mm
ENGINE TO P END 4-5
Cylinder Head
Cylinder Compression Measurement
. Start the engine
. Thoroughlv warm up the engme so (hat the engme oil between the
plslOn and cylinder wall will help seal compression as It does dunng
normal running.
e Stop the engine.
e Remove the spark plug, and screw a compression gauge firmlv into the
spark plug hole.
Special Tool - Compression Gauge: 57001·221 (Al
Compression Gauge Adapter: 57001 · 11 59 [ 8 ]
e Wlth the throllie fully open, tum the engme over sharply With the
k,lckstarter several times until the compresSion gauge stops rising; the
compression IS the highest readmg obtainable
Cylinder Compression
Usable Range:
KXl25: 770 - 1 2OOtI;Pa (7.7 - 12.0 kgJcm~. 109 - 171 psi)
KX250: 840 - 1 300 kPa (8.4 - 13.0 kgJcm ~. 119 - 185 psi)
* 11 cylinder compression is higher than the usable range, check the
following:
1. Carbon build ·up on the piston head and cylinder head - dean off
any carbon on the piston head and cylinder head.
2.
Cylinder head gasket. cylinder base gasket - use only the proper
gaskets for the cylinder head and base. The use of gasket of the
incorrect thickness will change the compression ,
If cylinder compression IS lower than the usable range, check the
following:
1. Piston/cylinder clearance, piston seizure.
2. Gas leakage around the cylinder head - replace the damaged
gasket and check the cylinder head for warping.
3. Piston ring, piston ring groove.
*
Removal
• Drain the coolant (see Coolant Change in the Cooling System
chapter).
e Remove:
Side Covers
Seat
Radiator Covers
Fuel Tank
Muffler
Water Hoses
Spark Plug [A)
Engine Mounting Brackets [B)
e Remove the cylinder head nuts (AL and take off the cylinder head
[B] and gasket.
4 -6 ENGINE TOP END
Installation Notes
• Replace the head gasket w it h a new one.
e Scrape out any carbon and clean the head with a high flash -point
solven t.
. Check for a crust of minerals and rus t in the head water jacket. and
remove them if necessary.
• Torque the cylinder head nuts.
TOf'qu8: - Cylinder Head Nuts: 25 N-m (2.5 kg.-m , 18 tt.lb)
. Torque the engine mounting bracket nuts.
Torque -
Engine Mounting Bracke' Nuts:
Frame skle : 26 N-m (2.7 kg.m, 19.5 fI·lb)
Engine s ide : 34 N-m (3.5 kg-m , 25 ft-Ib)
. Torque the spark plug.
TOf'qutI - Spartl Plug: 27 N-m (2.8 kg-m , 20 tt· lb)
Warp Insp ection
e Lay a straig htedge [AI across the lower surface of the head at several
different points, and measure warp by inserting a thickness gauge [8]
between the straightedge and the head .
* II warp exceeds the service limit. repair the mat ing surface. Replace the
cylinder head if the mating surface is badly damaged.
Cylinder Head Wllrp
Service Lknlt
0.03 mm
•
ENGINE TOP END 4-7
Cylinder. Piston
Cylinder Removal
• Drain the coolant.
• Rem ove the cylinder head (see Cylinder Head Removal) .
• For KX125 model; take off the clutch cable lower end at the clutch
release lever.
• Loosen the clamps, and pull the carburetor out of the holder and the
air cleaner duct.
• Remove the carburetor holder mounting bolts. and take out the holder
and reed valve.
• Remove the right cover at the cylinder.
• Remove the shaft lever nut [BJ, and take off the shaft lever [AJ .
• Remove the cylinder nuts.
• lift off the cylinder, and remove the cylinder base gasket If necessary,
tap lightly around the base of the cylinder with a plastic mallet [AJ,
taking care not to damage the cylinder.
• Remove the exhaust valves from the cylinder (see Exhaust Valve
Removal) .
Cylinder Installation Notes
• Scrape any carbon out of the exhaust port
• Check for a crust of minerals and rust in the cylinder water jackel and
remove them if necessary.
• Replace the cylinder base gasket with a new one .
• Apply engine oil to the piston surface, piston rings and cylinder bore.
• Check to see that the pin in each piston ring groove is between the
ends of the piston ring, and fit the base of the cylinder over each ring,
pressing in on opposite sides of the ring as necessary. Be certain that
the rings do not slip out of position .
• Torque the followi ng:
Torqu e -
Cylinder Nut :
KX125: 25 N -m 12.5 kg·m, 18 ft·lbl
KX250: 34 N -m 13.5 kg -m. 25 ft -Ibl
Shaft lever Nut : 8 .8 N·m 10.9 kg-m _ 78 In-Ibl
Piston Removal
. Remove the cylinder .
• Stuff a clean cloth into the crankcase opening around the connecting
rod so that no parts will fall into the crankcase .
• Remove one of the piston pin snap rings with needle nose pliers.
• Remove the piston by pushing the piston pin out the side from which
the snap ring was removed.
Special Tool - Piston Pin Puller Assembly: 57001·910 [AJ
• Remove the piston ring (5) .
Speclal Tool - Piston Ring Pllars: 57001 -115 [8 ]
4-8 ENGINE TOP END
o If the special tool is not available, carefully spread the fing opening
with your thumbs and then push up on the opposite side of the ring
to remove it.
Piston Installation Notes
. Stuff a clean cloth into the crankcase opening around the connecting
rod so thai no parts wilt fall into t he crankcase.
• Scrape off any carbon of the piston, then lightly polish the piston with
fine emery cloth .
• Clean carbon and dirt out of the piston ring groove using a suitable
toot.
C.rbon particles can be very .bruln to piston ringa.
aucfI partie'" to filII onto 1M cylinder wan• .
Don't allow
• When installing the piston ring on the piston, note the following:
o If installing the piston ring by hand, first fit one end of the piston ring
against the pin in the ring groove, spread the ring opening with the
other hand and then slip the ring into the groove.
OThe piston ring have a " R" mart [AJ on it upper surface.
o Install the ring so that t he pin (A]
in the piston ring groove is between
the ends of the piston ring.
I
. Apply 2·stroke engine oil to the connecting rod needle bearing and the
piston pin.
• Install the piston. The arrow [AJ on the top of the piston must point
toward the front.
. When installing a piston pin snap ring [B], compress it only enough
to install it and no more.
CAIIT10N
Do not , . . . .n.p rlnos ••• ...mow.1 w • •ens .nd deform. "'-"'.
They could lall out and score Ihe cylinder wall.
I
iii
ENGINE TOP END 4-9
. F,t a new piston pin snap ring mto the side of the piston so that the
fmg opel1lng ie] does not cOincide with the notch [ Djln the edge of
the piston pin hole
CyliiJder Wear Inspection
NOTE
o Measure
the cylinder Inside dIameter when the cylinder is cold
(loom or ambient femperature)
e lnspect the Inside of Ihe cylinder for scratches and abnormal wear.
* If the cylinder IS damaged or badly worn, replace It wi th a new one .
• Since thele IS a difference in cylinder wear In d ifferent d lrecllons, lake
a side 10 side and a front-to back measurement shown In the figure.
'* If any of the cylinder inSide diameter measurements exceeds the service
limit. the cylinder must be replaced With a new one since the ELECTRO
FUSION cylinder cannot be bored or honed.
Cylinder Inside Diameter
KX125:
Standard:
54.000 - 54.015 mm, and ~'Ithan
0.01 mm dIfference between any
two mealurements.
Service lImIt:
54.08 mm, or more than 0.05 mm
difference between any two
measurements.
KX250:
Standard:
66.400 - 66.415mm, and leu than 0.01 mm
different between any two
measurements.
Service L.lmlt:
66.48 mm. or more than 0.05mm
difference between any two measurements.
(A):
KXt2S
KX2S0
15 mm
30 mm
Piston Diameter Measurement
• Measure the outside diameter of the piston 18.0 mm ( KX125) or 20.5
mm (KX250) [AJ up from the bonom of the piston at a right angle to
the direction of the piston pin.
If the measurement IS under the service limit. replace the piston.
*
Piston Diame'er
10(125:
Standard:
Servk:e L.lmlt:
53.926 - 53.941 mm
53.78 mm
KX250:
Standard:
Sen-Ie. limit:
(A);
66.323
66.338 mm
66.17 mm
KXI2S - 5 mm
KX250 15 mm
4-1 0 ENGINE TOP END
Piston/Cylinder Clearance
The piston -Ie -cylinder clearance is measured whenever a piston or
cylinder IS replaced with a new one. The standard piston -la-cylinder
clearance must be adhered to whenever t he cylinder is replaced.
If only a piston is replaced, Ihe clearance may exceed Ihe standard
slightly. BUI it must not be less than Ihe minimum, in order to avoid
piston seizure.
The mest accurate way to find the piston clearance is by making
separate piston and cylinder diameter measurements and then comput ing the difference between the two values. Measure the piston diameter
as Just described, and measure Ihe cylinder diameter al Ihe very bottom
of the cylinder.
Piston/Cylinder Clearance
Standard:
KX125: 0.069 - 0.079 mm
KX25O: 0.072 - 0.082 mm
Piston Ring, Piston Ring Groove Inspection
. Visuallv inspect the piston rings and the piston ring grooves.
* If the rings are worn unevenlv or damaged, thev must be replaced.
* If the piston ring grooves are worn unevenlv or damaged, the piston
must be replaced and fitted with new rings .
• Check for uneven groove wear by inspecting the ring seating .
* The rings should fit perfectly parallel to the groove surfaces. If not, the
piston must be replaced .
• With the piston ring in its groove, make several measurements wit h a
thickness gauge [AJ to determine piston ring / groove ctearance.
* If the clearance exceeds t he service limi" measure the thickness of the
piston ring.
* 1' the ring has worn down to less than the service limit, rep lace t he ring;
if the groove width exceeds t he service limit, replace the piston.
Piston Ring/Groove Clearance
Standard:
0.04 - 0.08 mm
Service Limit
0.1 8 mm
Piston Ring Thlckne...
KXl25:
0.97 _ 0.99 mm
Standard:
Service Limit
0.9mm
KX250:
Standard:
Service Limit
1.17 - 1.19 mm
1.10 mm
Piston Ring Groove Width
KXl25:
Standard:
1.03 - 1.05 mm
Service Limit
1.10mm
KX250:
Standard:
1.23 - l.25mm
Service limit
1.30mm
ENGINE TOP ENO 4 -11
Piston Ring End Gap Inspection
e Place the piston ring {A ] Inside the cvllnder [ B ], uSing the piston to
locale the nng squarely In place
e Sel It close to the bottom of the cylinder. where cylinder Weilr IS low.
e Measure the gap between the ends of the ring with a thickness gauge
[e l
'* If the gap is Wide!" than the service limit the ring IS overworn and must
o
©""
be replaced.
~
R/
Piston Ring End Gap
KX125:
Standard:
0.25 - 0.45 mm
Service Llmlt
0.90 mm
KX25O,
Standard:
Service Limit:
0.25 - 0.45 mm
0.75 mm
00
_
Piston Piston Pin. Connecting Rod Wear Inspection
. Visually inspect the snap ring [A] still fi tted in place.
* If the ring shows weakness or deformation, replace the ring. Also if the
pin hole groove shows excessive wear, replace the piston.
• Measure the diameter of the piston pin [Bl with a micrometer.
* If the piston pin diameter is less than the service limit al any point,
replace t he piston pin.
• Using a cylinder gauge, measure the diameter of both of piston pin
holes in the piston and the inside diameter of the connecting rod small
end.
* 11 either piston pin hole diameter exceeds the service limit, replace the
piston.
* If the connecting rod small end inside diameter exceeds the service
limit replace the crankshaft assembly.
PI'ton Pin Dlam.te,
KX12.5 :
Standard:
Service LImit:
KX250:
Standard:
Service Limit
15.995 - 16.000 mm
1S.96 mm
17.99S - 18 .000 mm
17.96 mm
Platon Pin Hole Dlameler
KX12S:
16.000 _ 16.020 mm
Standard:
Service Umlt
16.07 mm
KX25O,
Standard:
Service LImit
18.000 - 18.020 mm
18.07 mm
Small End Inalde Diameter
KX12S:
Standard:
21 .003 - 21 .014 mm
21 .0S mm
Service LImit
KX250
Standard:
Service LImit
22.003 - 22.012 mm
22.05mm
1
l
@
0
4 -12 ENGINE TOP END
Exhaust Valve (KIPS )
Removal
e Remove:
Carburetor
Cylinder Head
e Remove the right cover at the cylinder.
e Remove the shatt lever nut [AJ, and lake off the shah lever [ B] .
• Remove the cvlinder (see Cylinder Removal) .
• Tum the cylinder up side down .
• Remove the plug [A] and the gasket r B) at the left side of the cylinder.
• Pull out the operaung rod (A] as far as II goes.
• Remove the operallng rod retaining screw (8).
• Remove the exhaust valV9 in accordance with the following procedure.
KX125:
o lift up and remove the right exhaust valve [ A] with idle gear ( 8) and
remove the valve guides [C].
o lift up the left exhaust valve [ OJ, and pull out the operating rod [F] ,
O Take oul the left elChaust valve with valve guide {EJ.
IOWO,
o Remove the idle gear (B}.
o lift up the exhaust valves [A], and remove the valve guides [C],
O lift up the exhaust valves, and pull out the operating rod [OJ. Then
take out the exhaust valves.
ENGINE TOP END 4-13
. Remove the main exhaust valve in accordance with the following
procedure.
KX125:
e Remove the main valve cover [AJ. main valve rod cover [ SJ and main
shaft cover [C] from the cyhnder
• Remove the main shaft nut I B ] from the main shah [A], and pull out
the main valve gear [C],
CAUTION
Main s han nut "al len-hand threads .
• Unbolt the Allen bolt [ 8 ] from the main lever [A ]
. Position the main exhaust valve fuU open, and pull out t he main shaft
[AJ .
• Set the main exhaust valve full closed position, and remove the main
lever [8] .
• Unscrew the two main exhaust valve retaining screws rA)
. Take out t he pin [C] from the main exhaust valves [B) .
• Pull out t he main exhaust valves and main valve rod [DJ from the
cylinder.
4-14 ENGINE TOP END
KX25Q,
• Remove the main exhaust valve cover boilS, and remove the cover
[A] and gasket [8].
e Rem01l8 the mounting bolts (AJ, and remove the holder [8) and main
exhaust valve [C) .
Installation Notes
e Scrape out any carbon and clean the valves with a high flash-point
solvenl
• Check the following for signs of damage:
Exhaust Valves and Valve Operating Rod
Oil Seal on Rod Seal Plug
D -rings
Gaskets
* If n9C8SSaIY. replace them with new ones.
• For KX250 model, be careful not to mi. up the right and leh exhaust
valves. The right valve has an identifying groove [AJ.
. Applya 2-stroke engine oil to the following:
Exhaust Valve Upper and Lower J ournals
Exhaust Valve Pinions
Valve Guides (inside)
Valve Operating Rod Journals
Valve Operating Rod Rack
Main Exhaust Valve Parts
e Applya high temperature grease to the oil seal lip on the operating rod.
Adjusl Ihe exhausl valve position in accordance with the following
procedure.
10(125:
. Install each small main exhaust valle [Al on the lalle holder ( B] with
pin
eel.
ENGINE TOP ENO 4-1 5
. Put the main exhaust valves [BJ on the groove of the valve holder
[Al ·
NOTE
o Be careful not to mix up the right and left main exhaust valves.
. -0--l
C. Left Main Exhaust Valve
D. Righi Main E)(haust Valve
©
• Insert the left and right main exhaust valve sets [e) into their holes in
the cylinder [A] .
e lnstallthe retaining screws
(el
securelv .
• Check that the left and right main exhaust valves slide smoothly.
• Put the pin [A] in the left and righl main exhaust valve holes .
• Fit the main lever [8] to the pin .
• Insert the main shaft (A] in t he hole of the left upper end at the cylind8f
and through the hole in the main lever [B] . Then put the main shah
into the cylinder hole.
• Fix the main lever [8] to the main shaft [A] with the Allen bolt (C] .
To rque - Allen Bolt : 3.9 N-m (0.4 kg-m, 35In-lb)
• Check that the main exhaust valves slide smoothlv.
-
@
4-16 ENGINE TOP END
. Tum the cylinder upside down .
• Insen the exhaust valves in the cylinder.
The right exhaust valve [AJ
is smaller than leh exhaust valve, and it has two marked teeth [8] .
,
I,J
. Insen the operating rod and adjust the exhaust valve position.
O Engage the left exhaust valve pinion with the rod rack SO that the
marked tooth [AJ on the pinion is positioned toward the front of the
engine. The marked tooth on the valve pinion should align with the
groove (81 on the rod.
o Install the idle gear so that the punch mark. [8] on the idle gear pinion
is between the marked teeth (AJ on the right exhaust valve pinion .
• Mount the valve guides [B, OJ on the exhaust valvos [AJ and idle gear
[eJ.
• Tum the cylinder upside down .
• Push the operating rod seal plug into the cylinder until the O-ring
portion ,
• Pull out the operating rod as far as it goes.
• Install the main valve rod [A] in the cvlinder so that grooved side [B]
faces outward.
A
ENGINE TOP END 4-17
• Install the main valve rod cover [A)except gasket to prevent the main
valve rod from movmg
• Position the mam exhaust valves full open
• Remove the main valve rod covet
. With the main exhaust valves full open, check that the end 01 the main
valve rod and cylinder are aligned [AJ .
• Install the mam valve gear [BJ and nul [C) on the main shalt [A], and
lighten the nut
.h..""'h.. ,... ... = N
1M.'"
Torque
Mai n S haft Nut: 8.8 N-m (0.9 kg-rn, 78 In-Ib)
•
c
;.
.
_
I
• Check the gasket on the left plug for Signs of damage.
* If necessary, replace
II with a new one.
e lnstallthe left plug on the cylinder
Torque
Operating Rod left Side Plug: 22 N-rn (2.2 kg-rn, 16.0 ft-Ib)
. Push the rod seal plug Into the cylinder, and install the retaining screw
securely .
• Install the main valve cover, main valve rod cover and main shaft cOlier
on the cylinder
KX250:
. Tighten the main exhaust lIallle bracket mounting bolts securely.
Check that there is no gap [A] between the bracket [8] and cylinder.
A
) '--TT---'---
00
4-18 ENGINE TOP END
. Engage the valve pinions with the rod rack [A] so that the punch
marlts ( Red Paint) [ B] on the pinions are positioned toward the front
of the engine. The punch marks on the valve pinions should align with
the grooves
[el on the rod.
o
o
®
NOTE
o The marked tooth [AJ
is identified by its shape also.
e Checlo: the gasket on the left plug for signs of damage.
* tf necessary, replace it with a new one.
• Install the plug on the leh side of the cylinder.
T~e
- Operating Rod Left Side Plug: 15 N-m (1 .5 kg-m, 11 ft·lb)
Punch Mark
(Red Pamt)
ENGINE TOP END 4-19
Muffler (Expansion Chamber, Silencer)
Removal
• Remove the right side cover.
• Remove the mounting bolts [ B] and pull the silencer (A] off toward
the rear .
• Remove the exhaust pipe holding springs [A) .
• Remove the muffler damper mounting bolts (A], and pull off the
expansion chamber toward the hOn! .
• Remove the exhaust gasket.
Installation Notes
. Scrape any carbon out of the expansion chamber.
• Check the exhaust O-rings for signs of damage.
If necessary, replace them with new ones.
*
S;lencer Pack;ng Change
Replace the silencer packing if the exhaust noise becomes too loud
or the engine performance drops.
• Remove the silencer .
• Remove the inner pipe mounting bolts [A] , and pull the inner pipe
[B] out toward the rear.
4-20 ENGINE TOP END
.Pull off the old sil8f1cef packing, and install the new silencer packing
[AJ into the silencer.
• Install the inner pipe into the silencer.
• Install the silencer.
7
ENGINE RIGHT SIDE 5-1
Engine Right Side
Table of Contents
Exploded View ................. ...........................................
................................. 5· 2
Specifications ................................................ ..........................................................5 -4
Clutch Cable .......................... .......................................... .....................................5-5
Free Play Check ...... ....................
.. ............................................................5·5
Free Play Adjustment. .......... ...............
. .. .......... ........................................... ... 5-5
Removal ........................................... ......... ...................................................... " ... 5-5
Installation ... ...............
.............................................. ................................... 5 -6
lubrication and Inspection .............
......................................................... 5-6
.................................................................. 5-7
Clutch Cover. ......................... .. ...... ......
Clutch Cover Removal ........................................... . ..................... ......... .. ............. 5- 7
Clutch Cover Installation Notes ............................ .............. .................................. 5 -7
Right Engine Cover .............. ..
...............
. .. ................................................ 5-8
Removal... ...... ....................................
................. ................... ..................... 5 -8
Installation Notes ................................................... ................................................ 5-8
Disassembly ............................................................... ...........................................5-9
Exhaust Advancer Assembly Disassembly/ Assembly Notes .. ............... .. ............ 5 -' 0
Assembly Notes ........................... ....................................................................... 5- 10
Clutch ....
....................................................................................... .............. 5- 11
Removal ......................................... .....................................................................5 - 11
Installation Notes .................................................................................
.......... 5-13
Friction and Steel Plates Wear, Damage Inspection ............ ............................... 5 -14
Friction and Steel Plate Warp Inspection .............................................................5 -14
Spring Free Length Measurement ................ ........................................................ 5-14
Friction Plate/Clutch Housing Clearance ............................................................ 5-14
Clutch Hub Spline Inspection ..............................................................................5-15
External Shift Mechanism .........................................................................................5-16
Removal ............................. .. ....................... ........... ........... ......... ....................... 5 -16
Installation Notes ................................................................................................. 5 -16
Inspection ............................................................................................................. 5 -16
Primary Gear .............................................................................................................. 5- 17
Removal ................................................................................................................5 -17
Installation Notes .................................................................................................. 5- 17
Kickstarter ........................................ .. ....................................................................... 5- 18
Removal .......... ..................................................................................................... 5- 18
Disassembly/ Assembly Notes ............................................................................. 5-1 8
Idle Gear Removal Notes ........ ............................................................................5 - 19
Idle Gear Installation Notes ..................................................................................5-19
5-2 ENGINE RIGHT SIDE
Exploded View
KX125c 1 J
•
12
"
J;'
~,'---~1
___ ~Cl~~~~:
e~
,/~~'~~ ~ ~
~
~~o~o:,
/~ ,17
/" ~~-
~~1
~
V
1. CMc:h Leve,
2. Clutch cable
3. Release Leve, Sklft
4, Clutch Cover
5.
8.
7.
8.
9.
Cluk:tt Pushe,
Holder
CIU1ch Spring Holder
CMch Hub
Frk:Uon Plate
to.Steel Plate
It .Clutch Whee'
12.Clutch Housing
13.Sleeva
1• .Lever Shaft
TO
l
~
_~
~
0
,.
~f;l
~~~
15.EJ:haust Advancer Assembly
M
,I
'J
~~~--1
1> ~
T6
~~6)
¢P~
0 : Apply 011.
l8.Prlmary Gear
17.Gear Set Leve,
IS.Retum Spring Pin
TO : ApIXY trans mi"lon 011.
Tl : 98 N·m (10 .0 kg -m, 72 ft ·lbl
T2 : B.B N·m 10.9 kg-m, 72 in·lbl
IS.Shlft Shaft
2O.Klckatarter Idle Gear
21 .Rak:hetGear
22.KIck Gear
23.KIck Shaft
L : Apply. non-permanenl IodI:lng
aRent to the thread • •
M : Apply molybdenum dlsultkHt
gre•••.
G : Apply high temper.ture gre. ...
T3
T4
T5
T6
;
:
:
:
3 .9 N-m (0 .4 kg -m , 35 [n-tb)
S9 N-m (6 .0 kg -m , 43 ft~b )
22 N·m 12 .2 kg -m, 16 ft·lbl
9 .8 N-m 11 .0 kg-m . 87 tn -Ib)
ENGINE RIGHT SIDE 5-3
KX250 :
~
.
T1
11
@ka /
____ - ;(T3)~ ~ -<~
~
--- a--1I Y~
... ' aO~r
"' 0 '"
/ ~.. ),
( ~.
~
1.,-,./,1
M I.-
I
I
M ~
.,;,
••• 111/
:.J
~ oo..... /
15
,r,p
~
19
1. Clutch Lever
15. Primary Gear
2. Clutch Cable
3. Friction Plaia
4. Steel Plale
16. Waler Pump Drille Gn,
,.
Clutch Hub
Clutch Housing
7. Sleeve
Clutch Cover
••
••
9. Operating Plale
10.
11 .
12.
13.
14.
Clutch Pusher
Lever Shaft
Exhaust Advancer Assembly
Release Lel/er Shaft
Push Rod
G
17. Gear Set Lever
o
18. Return Spring Pin
19. Shift Shaft
20. Klckl!arter Idle Gear
TO
21 .
22.
23.
L
Ratchel Gear
Klet Gear
Kick Shaft
: Apply a non-permanent locking
ag"nllo the threads.
M : Apply molybdenum disulfide
grease.
: Apply high temperalur.
gre•••.
: Apply 011.
: Apply transmission oil .
: 8 .8 N-m !0.9 kg-m, 78 In-Ibl
: 98 N -m 110 kg-m, 72 fl · tbl
: 3.9 N-m (0. 4 kg·m , 35 In-Ibl
T1
T2
T3
14 : 22 N·m 12.2 kg -m. 16.0 ft -Ibl
T5 : 49 N -m 15.0 kg-m . 36 ft-lbJ
5-4 ENGINE RIGH T SIDE
Specifications
,
Item
Standard
Service limit
Clutch :
2 - 3 mm
2.92 - 3.08 mm
Lever free play
Friction plate thickness
2.8mm
Steel plate thickness:
KX125 .
Thick (1)
146 - 1 .74 mm
Th;n (6)
1.36 - 164 mm
1 46 _ 1 74 rnm
Not more than 015 mm
Not more than 0.2 mm
KX250 :
Friction plate warp
Steel plate warp
136 mm
1.26 mm
1,36 mm
O.3mm
03mm
Clutch spring free length:
KX125
KX250
375 mm
36.Qmm
350 mm
336 mm
Friction plate/clutch housing
clearance:
KX125
KX250
Special Tools - Kick Shaft all Seal Guide: 57001·263
Shift Shaft Oil Seal Guide: 57001·264
Flywheel Holder. 57001·1313
Clutch Holder: 57001·1243
OUtside eire!!p Pliers: 57001·144
Presaure Cable luber: K56019-021
0.10 - 0.60 mm
015 - 0.45 mm
Q.9mm
OBmm
ENGINE RIGHT SIDE 5-5
Clutch Cable
Due to friction plate wear and clutch cable stretch over a long period
of use, Ihe clutch must be adjusted in accordance with the Periodic
Maintenance Chan.
To 8Yc»ci • serklus bum, never touch the hot engine or •• haUlt
chamber during clUk:h adjustment
Free Play Check
. Slide the clutch lever dust cover [B] out of place.
• Check that the clutch cable upper end is fully sealed in the adjuster
[DJ .
• Check that the clutch lever [A] has 2 - 3 mm of play [ EJ.
* If it does not, adjust the lever play
Free Play Adjustment
• Slide the clutch lever dust cover out of place.
e loosen the knurled locknut [e].
. Turn Ihe adjuster so that the clutch lever will have 2 - 3 mm of play.
NOTE
O Be sure that the outer cable end at the clutch lever is fully seated in
the adjuster 8/ the clutch level, or it could slip into the place latel,
creating enough cable play to prevent clutch disengagement.
e Tighten the locknut.
e lf It cannot be done. loosen the locknut (8) at the upper 01 the clutch
cable, and turn the adlusting nut [A) so that clutch lever has 2 - 3
mm of play.
e Aher t he adjustment is made. tighten the locknut, and start the engine
and check that the clutch does not slip and that it releases properly.
Removal
e Slide the dust cover out of place.
e Loosen the locknut at the upper of the cable, and tum t he adjusting
nut to give the cable plenty of play.
e Loosen the knurled locknut [ BJ at the clutch lever, and screw in the
adjuster [A J.
e Une up the slots (C] in the clutch lever, knurled locknut. and adjuster,
and then free the cable from the clutch lever.
5-6 ENGINE RIGHT SIDE
• Free the dutch inner cable lip from the clutch release lever.
CAIITlON
00 nol remove the clutch release shaft unteu " 11 absolutely
necessary. If removed, the re lease 8hatt 011 .eal must be replaced
with a new one .
• Pull the clutch cable out of the frame.
Installation
.Aun the dutch cable according to the Cable, Harness, Hose Routing
section of the General Information chapter.
.Adjust the clutch cable (see Free Plav Adjustment).
Lubrication and Inspection
• Lubricate the clutch cable using th e pressure cable luber (special tool:
K56019 -021) [Al in accordance with the Periodic Maintenance
Chan.
• With the cable disconnected at both ends, the cable should move
freely within the cable housing (see General Lubrication in the
Appendix chapter).
A
ENGINE RIGHT SIDE 5-7
Clut ch Cover
Clutch Cover Removal
KX125:
• Drain the transmission oil (see Transmission Oil Change in the Engine
Bottom End(Transmission chaptet) .
• loosen the locknut at the upper of the clutch cable, turn the adjusting
nut to give the cable plenry of play, and swing the clutch cable out
away from the clutch lever.
e Remove the lower end of the clutch cable [C] from the clutch release
lever {A] .
e Tum the clutch release lever toward the rear, and free the release shaft
{ B] from the clutch spring plale pusher.
e Unbolt the clutch cover bolts, and take off the clutch cover [ D].
CAUTION
Do nol remove the clutch release shaft [A] unless It Is absolutely
necessary. If remo'lad, you must replace the 011 seat [ 8 ] with a new
one and apply high temperature grease liberally to the 011 seal lip.
KX250:
e Drain the transmission oil (see Transmission Oil Change in the Engine
Bottom End/ Transmission chapter) .
e Unbolt the clutch cover bolts, and take off the clu tch cover [ AJ .
Clutch Cover Installation Notes
e There are two knock pins of the mating surfaces of the right engine
cover and clutch cover.
e For 10(125 model, tum the clutch release lever t oward the rear.
e Replace the clutch cover gasket with a new one.
e For 10(125 model, adjust the clutch cable (see Clutch Cable Free Plav
Adjustment) .
5-8 ENGINE RIGHT SIDE
Right Engine Cover
Removal
• Remove:
Transmission Oil (drain)
Coolant (drain)
Cooling Hose Lower End
Kick Pedal
Clutch Cable
lower End (KX1 25 only)
Brake Pedal
Water Pump Cover
Impeller
e Remove the KIPS cover from the right side of the cylinder.
• Remove the nut [AJ, and take off the shaft lever [8).
• For K.X125 model. turn the clutch release lever toward the rear and
the release shaft from the clutch spri ng plate pusher.
free
• Remove the cover bolt and take off the right engine cover and gasket.
Installation Notes
e There are two knock pins on the mating surfaces of th e crankcase and
right engine cover.
eln case the exhaust advancer assembly has been removed, install it and
tum the gear so as 10 level the gear drive pin [A].
" the gear drive pin Is not positioned level, It may fall out .......
In'taliing the rlghe engine cover.
• For K.X125 model, turn the clutch release lever toward the rear .
• Install the right engine cover using the kick shaft oil seal guide [A} to
protect the cover oil seal.
Special Tool - 011 Seal Guide, 1%118: 57001·263 [A}
. Fit the shaft lever boss [A} in the groove of the valve operating rod
collar [ 8}, and install the shaft lever [elan the lever shaft .
• Torque the shaft lever nut.
NOTE
o Tighten the shaft lever nut while holding the valve opefa6ng fad all
the way in.
Torque - Shah Levar Nut : 8 .8 N-m 10. 9 kg-m, 78 in-Ibl
ENGINE RIGHT SIDE 5-9
e TorQue the water pump Impeller bolt
Torque
~
Water Pump Impeller Bo ll: 6.9 N-m (0.7 kg-m, 61 In-Ib)
. Apply grease to the Inside of the brake pedal boss .
• Torque t he brake pedal mounling boll.
Torque
~
Brake Pedal Mounting 801t: 8.8 N-m (0.9 kg-m, 78 In-Ib)
. Fill the cooling system with coolanl (see Coolant Fllhng In the Cooling
System chapter) .
• Fill the transmiSSion with 011 (see Transmission Oil Change In the
Engine Bottom End!TransmlSSlOn chapter).
• For KX1 25 model; adjust the clutch cable.
• Check the rear brake.
D isassembly
• Remove the right engine cover.
• Turn the lever shaft [A] to the righI, and remove the e)(haust advan cer
assembly [8] .
• Remove the Allen bolts [C). and take off the advancer lever .
• Remove the plug screw [A] and take out the positioning pin [ 8 ] .
• Pull the lever shah [C] out of the right engine COVel" •
• Pull off the water pump shah (see Waler Pump Shah Removal in the
Cooling System chapter)
CAlJT10N
For KX125 model; do not remo"". the clutch release shaft unless It is
absolutely necessary. "remond, you must replace the oll ..al with
a new one.
5-10 ENGINE RIGHT SIDE
Exhaust Advancer Disassembly/Assembly Notes
e Tne exhaust advancer assembly (A] consists of the following parts.
A. Pins
B. Rod
C. GUide
G. Needle Bearing
H. Spacer
I. Collar
D. O-ring
J. Spnng
E. Steel Balls
F. Holder
L Gear
K)(2SO '
K. Washer
~(~~
l~ ~
i"' ®F<
~~~~
~
. Check the exhaust advancer assembly parts for damage.
* Any damaged pans should be replaced with new ones.
. When assembling, apply molybdenum disulfide grease between the
rod and holder.
~®A
K)( 12S,
~~~l
o·
¢i(D
L
~ [email protected] 8
~®
Assembly Notes
• For KX125 model, in case the clutch release shaft has been removed,
be sure to replace the oil seal with a new one.
e Apply high temperature grease to the oil seal lips before inserting the
lever shaft.
• Apply molybdenum disulfide grease to the surface of the lever shaft..
and insert the 181161' shaft into the right engine cover hole.
• Torque the advancer lever mounting Allen bolts [ D].
TOf'CIlHI - Advancer Lever Mounting Allen BoHs: 3.9 N-m (0.4 kg-m, 35
In-Ib)
e Fit the advancer lever pin [A] into the groolle [B] on thE> eIChaust
adllancer assembly [e], and install the assombly in th e engine cover
while turning th e leller shaft to t he left .
• Tighten the eIChaust vallie adllancer shaft plug screw securely.
ENGINE RIGHT SIDE 5-11
Clutc h
Removal
KX125:
• For KX125 model. remove the clutch cable [8] .
• Remove the clutch cover (Al .
• Remove the magneto cover.
• Unscrew the pickup coil mounting screws and remove the pickup coil
[8] from the stator.
• Install the Ilywheel holder (AJ on the magneto flywheel.
NOTE
o Use the flywheel holder to prevent the clutch flom rotating.
Special Tool - Flywheel Holder: 57001·1 313 (Al
KXI25:
. Remove the flat washer [8] (if provided) . clutch pusher [A] and
spring plate pusher [C] in the spring plate (D).
• Remove the clutch hub nut (A] .
• Remove the clutch assembly. needle bearing [Al , sleeve (8) and
thrust washer [e).
. Separate the clutch gear assembly and clutch housing from the clutch
assembly.
5·12 ENGINE RIGHT SIDE
. Unscrew the clutch spring bolts [Al , and remove the spring plate
[BJ , spring (C]. clutch hub (0 ) , friction plates and steel plates from
the clutch gear.
KX25O,
. Remove the clutc h spring bolts [Aj , spring, and clutch pressure plate
[8 1·
• Remove the push rod holder [AJ, flat washer [ B1. friction plates, steel
plates, and push rod
rel.
• Remove the clutch hub nut [Al and washer.
NOTE
o Use the clutch holder to prevent the clutch hub from rotBting.
Special Tool - Clutch Holder: 57001-1243 [B]
.Remove Ihe clutch assembly, needle bearing (AJ , sleeve [8 ). and
thrust washer [C] ,
ENGINE RIG HT S ID E 5-13
Installation Notes
. Apply molybdenum disulfide grease to the outside of the sleeve.
• Apply transmission oil 10 the inside of the dutch housing gear and
kicks tarter d riven gear.
e l nstall the friction plates and steel plates, starting with a friction plate
and alternating them. Finish with a friction plate.
CAIITlON
tf dry steel plalel and friction plates are installed, apply transm ission
01110 the surfaces of each plale 10 avoid c lutch plate .elzure .
• Torque t he clutch hub nut.
Torque - Clutch Hub Nut: 98 N-m (10 kg-m, 72 ft-Ib)
NOTE
OUss the flywheel holder (KX125) Of clutch holder ( KX2S0) to
prevent the clutch hub from (otating.
Special Tool - Flywheel Holder: 57001-1313
Clutch Ho lder: 57001-1243
e Then stake the clutch hub nut [AJ in three points {B] 10 the spline
grooves to secure it in place.
CAIITlON
When staking the nut, be careful not to hit the shaft Itse " . Such a
shock could damage the shaft andJor bearings.
. Apply molybdenum disulfide grease to the rubbing portion of the
clutch spring plate pusher.
• Torque the clutch spring bolts.
Torque - Clutch Spring Bolts: 8.8 N-m (0.9 kg-m, 78 In-Ibl
NOTE
o Use the flywheel holder to prevent the clutch from rotating.
Special Tool - Flywheel Holder: 57001 -1313
A
5-14 ENGINE RIGHT SIDE
Friction and Steel Plates Wear. Damage Inspection
. Visuallv Inspect the friction and steel plates to see if they show any
signs of seizure, or uneven wear.
* If any plates show signs of damage. replace the friClion plates and steel
plates as a set.
e Measure the thickness [AJ of the friction plates [8] and steel plates
with vernier calipers.
* If they have wom past the service limit, replace them with new ones

[
-!'-
Friction Plate Thlcknes.
Standard:
Senllee Limit
2.92 .... 3.08 mm
2.8mm
Steel Plale Thickness
KXl25 :
Standard:
Service Limit
Thick (11 1,46 - 1.74 mm
Thin (6p .36 .... 1.64 mm
Thick (1)1.36 mm
Thin (6) 1.26 mm
KX250 :
Standard:
Service limit
1.46 .... 1.74 mm
1.36 mm
Friction and Steel Plate Warp Inspection
• Place each friction plate or steel plate on a surface plate, and measure
the gap between th e surface plate (AJ and each friction plate or steel
plate [8] with a thickness gauge [C}. The gap is the amount of
friction or steel plate warp.
* If any plate is warped over the service limit, replace
Friction and Steel Plates Warp
Friction Plate
Standard:
Not more than 0.15 mm
Service limit:
0.3 mm
It with a new one.
Steel Plate
Not more than 0.2 mm
0.3mm
Spring Free Length Measurement
. Since th e spring becomes shorter as it weakens, check its free length
to determine its condition.
* If any of the springs is shoner than the service limit, it must be replaced.
Clutch Spring Free Length
KX125:
Standard:
37.5 mm
Service Limit:
KX2SO,
Standard:
Service limit:
3&.Omm
35mm
33.8 mm
Friction Plate/Clutch H ousing Clearance
• Measure the clearance betwOOfl the tangs [A] on the friction plate and
the fingers [ 8 ] of the clutch housing.
* If this clearance is excessive, the clutch will be noisy.
* If the clearance exceeds t he service limit, replace the friction plates.
Friction Plate/Cl1Ik:tI HOUSing Clearance
KXI2.5:
Standard:
Service Limit:
KX2SO ,
0.10 _ O.60mm
Standard:
Service limit:
0.15 - 0.45 mm
0.8mm
0.9mm
B
ENGINE RIGHT SIDE 5· 15
Clutch Hub Spline Inspection
e Vlsually Inspect where the teeth on the steel plates wear against the
splines [A] of the clutch hub
If there are notches worn InlO the splines, replace the clutch hub. Also,
replace the clu tch plates ,f their teeth are damaged.
*
5-16 ENGINE RIGHT SIDE
External Shift M echanism
Removal
• Remove:
Shift Pedal
Magneto Cover
Right Engine Cover
Clutch Housing
• Pull out the external shift mechanism [AJ .
• Remove the bolt [8], and lake off the gear set lever [C) .
Installation Notes
. Insert the shift shaft into the crankcase using the shift shaft oil seal
guide [A] on the oil seal in the left crankcase half to proteclthe seal.
e Before installing the shift shaft, apply high temperature grease to the
oil seal lips.
Spec'" Tool - Shift Shaft 011 Seal Guide: 57001-264 [Al.
Inspection
. Check the shift shaft [AJ for bending or damage to the splines.
* If Ihe shaft is bent, straighten or replace it. If the splines afe damaged,
replace the external shift mechanism.
• Check the relum spring [ 8 ] and arm spring
[CJ for cracks or distortion.
* If t he springs are damaged in any way, replace them.
• Check the shih mechan ism arm [ 0 ] for distortion.
* If the shIh mechanism arm is damaged in any way, replace the shih
mechanism .
• Check that the return spring pin [A] is not loose.
* If it is loose, unscrew it. apply II non-permanent locking agent to the
threads, and torque it.
Torque - Rehlm Spring Pin: 22 N-m (2.2 kg-m, 16.0 ft·lb)
• Check the gear set lever and its spring for cracks or distortion.
* If the lever or spring is damaged in any way, replace them.
ENGINE RIGHT SIDE 5-17
Primary Gear
Removal
• Remove the right engme cover (see RIght EngIne Cover Removal) .
• Remove the clutch (see Clutch Removal) .
• For KX125 model; femove the primary gear nut [AJ, spring washer,
woodruff key. prImary gear [ B]. and O-ring.
NOTE
OUse the flywheel holder to prevent the crankshaft from the rotating.
Special Tool - Flywheel Holder: 57001·1313
.For KX250 model; remove the circlip [A], and take off the water pump
drive gear [B] and primary gear [C].
Special Tool - Outside Clrcllp Pliers: 57001·144
Installation Notes
KX125:
. Flt the woodruff key [B] on the crankshaft groove .
• Install the spring washer so t hat concave side fa ces (A] inward .
• Torque the primary gear nut.
Torque - Primary Gear Nut: 59 N-m (6.0 kg-m, 43 tt-Ib)
NOTE
OUse the flywheel holder to prevent the crankshaft from the rotating.
Special Tool - Flywheel Holder: 57001·1313
KX2SO:
. Install the primary gear [A) so t hat chamfered side [B) faces outward .
• Replace the old circlip with a new one.
Special Tool - Outside Clrcllp Pliers: 51001·144
5-18 ENGINE RIGHT SIDE
Kickstarter
Removal
• Remove:
Right Engine Cover
Clutch Housing
• Pull the end of the kick spring [Al out of the hote in the crankcase .
• Remove the kickstarter assembly [8] .
• Remove the ratchet guide (AJ. and bolts (8).
Disassembly/Assembly Notes
e The kickstaner assembly consists of the following parts .
• Check the kickstarter assembly parts for damage. Any damaged parts
should be replaced with new ones.
A Idle Gear
B. Circlip
C. Washer
D. Spring
E. Ratchet Gear
F. Kick Gear
G. Kick Shaft
H. Kick Spring
I. Spring Guide
When assembling the ratchet gea, [Aj onto the kick shaft [8 ], aUgn
the punch mart [e ) on the ratehel gear with the punctt mark [el on
the klck.ru.tt.
. Apply molybdenum disulfide grease to the inside of the kick gear and
ratchet gear.
• Replace the circlips that were removed with new ones.
Special Tool - Outllde Clrellp Pliers: 57001 ·144
ENGINE RIGHT SIDE 5-19
Idle Gear Removal Notes
• Remove the right engme cover and clutch housmg before !dle gear
removal (see Right Engme Cover Removal and Clutch Removal)
• Remove the circhp [AJ and pull olf the idle gear I B).
Special Tool - Outside Clrcllp Pliers: 57001·144
Idle Gear Installation Notes
. Apply molybdenum disulfide grease to the inside of the Idle gear
• Replace the circltp that was removed With a new one.
Special Tool - Outside Clrclip Pliers: 57001·144
ENGINE REMOVAL / INSTALLATION 6-1
Engine Removal/Installation
Table of Contents
Exploded View .... .............
..............................................................................6-2
Engine Removal/ Installation .............. ... ........................... ............................... ... 6 -3
Removal... ...... ,.....
.... ...... .... .. ..................................... ..............6-3
Installatton Notes ,...............
. .......................................................6-3
6-2 ENGINE REMOVAL/ INSTALLATION
Exploded View
1, Frame
M : Apply molybdenum dlsuHlde grea•••
2. Engine Bracht
n : 26 N-m (2.7 kg-m, 19.5 It-Ib)
3. Pivot Shaft
4. Swing Arm
12 : 34 N-m (3.5 kg-m, 25 It-Ibl
T3 : 98 N-m (10.0 kg-m, 72 " -Ihl
ENGINE REMOVAL/ INSTALLATION 6 -3
Engine Removal / Installation
Removal
e Oraln the transmiSSion all (see Transmission Oil Change In the Engine
Bottom End!TransmlSSlon chapter) .
• O,am the coolant (see Coolant Change in the Cooling System
chap ter) .
e Remove:
Side Covers
Radiator Covers
Cooling Hoses
Seat
Fuel Tank
ExpanSion Chamber
Spark Plug
Carburetor (with Cables and Hoses)
Clutch Cable Lower End
Drive Chain
Engine Sprocket
Shift Pedal
Brake Pedal
• Disconnect the magneto output lead [Aj , and free the leads from the
frame .
• Remove the engine brackets [8j and mounting bolts [ C) .
• Place a jack [OJ under the frame to 11ft the motorcycle off the ground,
and put blocks under the front and rear tires to steady the motorcycle.
~·.WARNING
The swing arm pivot shaft also serves as the engine mounting bolt.
Take precautions to insure the frame Is well supported, and that the
motorcycle will not lall over WMn the pivot shaft Is removed.
Special Tool - Jack: 57001-1238
e Remove the engine brackets (AJ and mounting boits [8J .
e Puli out the swing arm pivot shaft [C).
e Lift the engine out to the right.
Installation Notes
e Torque the following nuts.
Torque - Engine Mounting Nuts: 34 N-m (3.5 kg-m, 25 ft-Ib)
Engine Bracke' Nutll:
(Engine Side): 34 N-m (3.5 kg-m, 25 ft-Ib)
(Frame Side): 2S N-m (2.7 kg-m, 19.5 ft-Ib)
Pivot Shaft Nul: 98 N-m (10.0 kg-m, 72 ft-Ib)
e Ta route the leads, cables and hoses, refer to the General Information
chapter.
e Ta install parts removed, refer to the appropriate chapters.
e Fili the cooling system with coolant (see Coolant Change in the
Coating System chapter) .
e Fili the engine with transmission oil (see Transmission Oil Change in
the Engine 80nom End!Transmission chapter) .
• Adjust:
Thronle Cable
Clutch Cable
Drive Chain
Rear Brake
ENGINE BOTTOM END / TRANSMISSION 7-1
Engine BoHom End/Transmission
Table of Contents
Exploded View. ........... ... ........... ............ .... .. ..... ........
. ......... .. ",.", .... '" ............. ",7 -2
Specifications .................. ................................. .............
.. ............................... 7-4
Transmission Oil ........................................................................................................7-5
Level Inspection ....................................... ..............................................................7-5
Change .................................................................................................................... 7 -5
Crankcase ....................................................................................................................7-6
Splining ...................................................................................................................7-6
Assembly ..................... ............................................................................................7·6
Crankshaft. Connecting Rod ....................................................................................... 7·8
Removal ...............
....................
...............................................7-8
Installation Notes ... .. ................................................................... ........................... 7-8
Disassembly Note ................................................... .. ........... ................................. 7-8
Assembly Notes ......................................................................................................7-9
Connecting Rod Big End Radial Clearance ...........................................................7-9
Connecting Rod Big End Seizure ..........................................................................7-9
Connecting Rod Big End Side Clearance ..............................................................7-9
Crankshaft Runout .......... ...................................................................................7-10
Crankshaft Alignment ................................. ......................................................... 7·10
Transmission .............................................................................................................7 -11
Shaft Removal.. ............. ........ .........................
. ........................................ 7 · 11
Shaft Installation Notes .......................................................................................7-11
Shaft Disassembly Note ....
..................................... ..
. ........................ 7-11
Shaft Assembly Notes ................................
. .................................................7-11
Shift Drum and Fork Installation Notes ...............................................................7-13
Shift Fork Bending ................................................................................................7 -13
Shift Fork/ Gear Groove Wear ...............................................................................7-14
Shift Fork Guide Pin/ Shift Drum Groove Wear ...................................................7 -14
Gear Damage ... ........ .............................................. ...............................................7 ·14
Gear Dog/ Gear Dog Hole Damage ..........
. ..............................................7-15
Ball Bearing Wear ....... ..............................
. ................... ....... ... 7 ·15
7 -2 ENGINE BOTTOM ENO / TRANSMISSION
Exploded View
KX1 2 5 :
13
1. Crankshaft Assembly
11 . Operallng Plate
: Apply liquid ga.1I8110 the left
2. Stator
3. Magneto FlywhH'
12.
13.
14.
M
o
TO
: 20 N-m (2.0 kg-m, 14.5 ft· lb)
: 22 N-m (2.2 k~ , 16.0 ft.lb)
: 8.8 N-m (0.9 kg-m, 78 ift.lb)
: 5.4 N-m (0.55 kg-m, 48 In-Ib)
4.
5.
e.
7.
Left Crenkca..
Righi Crankea..
DrfveShd
output Shaft
a. Engine Sproekltl:
9. Shift Rod
10. Shift Fof1I:
lG
Shift Drum
Shift Shaft
T1
Shltt Pedal
T2
: Apply molybdenum disulfide gr••• • • T3
: Apply 2..troke engine 011.
T4
: Apply Iran.mlnlon 011 to the
lran.mlnlon gears and shift
fork. , ek:.
G : Apply high temperature gre.ae,
and right ca• • mating .urlace.
ENGINE BOTTOM END / TRANSMISSION 7-3
KX250 :
A
~'
.Ad!,,-~ ..i§
14
1. Crankshaft Assembly
1'. Operating Plale
2. Stator
12. Shtft Drum
13. Shift Shaft
3.
4.
5.
6.
1.
8.
9.
10.
Magneto Flywheel
Left Crankcase
Right Crankcase
Drive Shaft
Output Shaft
EngIne Sprocket
Shift Rod
Shltt Fortt
~
j
"
14. Shift Pedal
M : Apply molybdenum diauilldeg,ea...
o : Apply 2-strO«I!1 engine 011.
TO : Apply transmission oU 10 the
tranaml •• lon gears and ahltt
for1cs , etc.
G : Apply high temperature greas• .
LG : Apply liquid gasket 10 the lett
and right case maUng Buriace.
Tl
T2
T3
T4
T5
:
:
:
:
:
20 N-m (2.0 kg-m , 14.5 ft·lb)
78 N-m (8.0 kg-m , 58 tt-Ib)
8.8 N-m (0.9 kg-m, 78 In-Ib)
5.4 N·m (0.55 kg-m. 48ln-lb)
22 N. m (2.2 kg-m, 16.0 ft-lb)
7-4 ENGINE BOTTOM END / TRANSMISSION
Specifications
Item
Standard
Service limit
Transmission Oil :
Transmission Oil:
Grade
Viscosity
Amount
SE class
SAEl OW30 or 10W40
10(125
KX250
Crankshaft. Connecting Rod :
Connecting rod bend
0.7L
0.85 L
Not more than 0.03 mm/ l 00 mm
Not more than 0 .03 mm!1 00 mm
Connecting rod twist
---
------0.2 mm/1 00 mm
O.2mm/ l00mm
Connecting rod big end radial clearance:
10(125
KX250
0.026 - 0.043 mm
0.037 - 0.049 mm
0 .09 mm
0.10 mm
0.40 - 0.50 mm
0.45 - 0.55 mm
Not more than 0.03 mm
O.70mm
0 .70 mm
0.05 mm
0.06
3.90
4.40
4.05
4.55
5.90
6.05
0 .30
3.80
4.30
4.25
4.75
5.80
6.25
Connecting rod big end side clearance:
10(125
10(250
Crankshaft runout
Trans mission :
Gear backlash:
Shift fork ear th ickness:
Gear shih fork groove width :
Shift fork guide pin diameter
Shift drum groove width
Speclal Tooll -
KX125
10(250
KX125
KX250
_
-
0.23 mm
4.00 mm
4.50 mm
4.15 mm
4.65 mm
6.00 mm
6.20 mm
Outside Clrcllp Pliers: 57001 -144
Bearing Puller. 57001 -158
011 Seal Guide, !JI13; 57001 -264
Bearing Puller Adapler: 57001-136
Crankcase Splitting Tool Assembly: 57001 -1098
Bearing Driver Set 57001 -1'29
Crankshaft Jig: 57001 -1174
Sealanl - Kawasaki Bond (Liquid GaMal - Silver): 92104-002
mm
mm
mm
mm
mm
mm
mm
ENGINE BOTTOM END / TRANSMISSION 7-5
Transmission Oil
In order for the transmission and clutch to function properly. always
maintain the transmission oil at the proper level and change the oil
periodically.
AWARNING
Motorcycle operation with Insufficient, deteriorated, or contaminated
transmission oU will cause accelerated wear and may result In
transmission seizure, accident, and Injury.
Leve/lnspection
. Situate the motorcycle so that it is perpendicular to the ground .
• If the motorcycle has just been used. wait several minutes unt il the oil
settles .
• Check that the oil level comes up between the upper level {AJ and
lower level {B1 through the oil level gauge (C) on the clutch cover.
* If the oil level IS too high. remove the excess oil using a syringe or some
other suitable device.
* '1 the oil level IS too low, add the correct amount 01 oil through the oil
filler opening. Use the same type and make 01 oil lhat is already in the
engine.
NOTE
O lf the transmission oil type and make are unknown. use any brand
of the specified oil to top up the level in preference to running the
engine with the oil level low. Then at your earliest convenience.
change the oil completely.
Change
. Warm up the engine thoroughly SO that the oil will pick up any
sediment and drain easily. Then SlOP the engine.
• Place an oil pan beneath the engine.
• Remove the transmission oil drain plug [Alan the bottom of the
engine, and let the oil drain completely.
NOTE
oHold the motorcycle upright so that the oil may drain completely.
• Check the gasket at the drain plug for damage.
* Replace the gasket with a new one if it is damaged .
• After the oil has completely drained out. install the drain plug with the
gasket. and torque it.
Torque - Transmission 011 Drain Plug: 20 N·m (2.0 kg-m, 14.5 ft-Ib)
. Fill the engine with a good quality motor oil specified below.
• Check the oil level.
Transmission 011
Grade:
Viscosity:
Amount
SE class
SAE 10W30 or 10W40
KX125 0.7 L
KX250 0.85 L
7 -6 ENGINE BOTTOM END / TRANSMISSION
Crankcase
SpHtting
• Remove the engine (see the Engine Rem oval/ Installation chapter) .
• Set the engine on a clean surface while parts are being removed .
• Remove:
Magneto Cover
Output Shaft Sleeve and O -tlng
Cylinder Head
Cylinder
Piston
Right Engine COvtlr
Clutch
Primary Gear
Kickstaner Assembly
Kickstarter Idle Gear
Gear Set Lever
Magneto Flywheel and Stator
Reed Valve (KX12S)
• Remove the crankcase bolts (A] .
• Install the crankcase splitting 1001 [ A ] and bearing puller adapter ( B]
into the left side of the crankcase. Be certain 10 screw the tool in all
the way.
Specl., Tool - Crankcase Splitting Tool A••embly: 57001 -1098 [A]
aurlng Puller Adapter: 5100'-136 [8 ]
eTighten the bolt on the crankcase splitting tool to split the crankcase
hatves.
• Once the crankcase is split, remove the crankcase splitting tool, and lift
off the left crankcase half.
• Pull out the shift rods [A).
. Oisengage the shift fork guide pins from the shift drum grooves.
• Take out the shift drum [8 ).
.Remove the shift forks [C] from the transmission gears.
• Take o ut the drive shaft [0] and output shaft [E] tog ether with their
gears meshed .
• Remove the crankshaft from the right crankcase half using 8 press.
Assembly
• Before fining the left case on the right case, note th e following:
o Chip off the old gasket from the mating surfaces of the crankcase
halves, and clean off the crankcase with a high flash -point solvent
After cleaning, apply transmission oil to the tran smission gears, shift
drum, shift forks and so on.
o Be sure to replace any oil seal removed wi th a new one. Press in the
new oil seal using 8 press and suitable tools so that the seal surface is
flush with the surface of the crankcase.
O Apply high temperature grease to the oil seal lips.
o Press in the ball bearings using the bearing driver set until the bearing
is bonomed.
ENGINE BOTTOM ENO / TRANSMISSION 7-7
Spee'-I Tool - S •• rlng Ortver Set 57001-1129
o Install the bearing for the output shaft into the left crankcase half so
that the stepped side faces [A] inside.
CAI1T1ON
Do not remove the bearings unless II Is necessary. Removal may
damage them.
Install the bearings for the cr.,..haft In the r~ht and left crankea..
so h i Ihftlr sealed aides face toward the 011 ... 1aide.
O Trghten the output and drive shaft bearing retaintng bolts securely.
0 11 t he crankshaft bearings stay on the crankshaft when splining the
crankcase, remove the bearings from the crankshaft and reinstall them
in the crankcase, and then assemble t he crankcase (see Crankshaft
Removal and Installation Notes) .
• Turn the crankshaft to BOC, and install the crankshaft jig (Al between
the flywheels oPPosite t he connecting rod big end to protect flywheel
alignment as shown .
o If the crankshaft has been removed from Ihe crankcase, Install the jig
between the crankshaft flywheels before pressing the crankshaft into
the right crankcase half.
Special Tool - Crankshaft Jig: 57001 -1174 [AJ
. Check to see that the crankcase knock pins are in place on the righ t
crankcase half. If any of them has been removed. replace it with a new
one.
• Apply liquid gasket to the mating surface of the left crankcase half.
Sealant - Kawasaki Bond (Liquid Gasteet - Silver): 921Q4..002
• Using a suitable tool on the left crankcase to press [AJ around the hole
for the crankshaft, fil Ihe crankcase halves together with a press on the
tool.
NOTE
a Constantly check th~ 8lignment of the two crankcase halves, and the
position of the transmission shafts, and shift drum. The front and
rear of the crankcase must btl pushed together evenly.
• Remove the crankshaft jig (special tool) from the flywheels .
• Tighten the crankcase boits starting with the ones around the
crankshaft, and then the farther ones.
Torque - Crankcase 801ts: 8.8 N-m (0.9 kg-m, 78 in-Ibl
• Check to see t hat the crankshaft. drive shaft, and output shaft all turn
freely (in the neutral poSition) .
If the crankshaft will not turn, probably the crankshaft is not centered;
tap the appropriate end of the crankshaft with a mallet to reposition it.
• Spinning the output shaft. shift the transmission through all the gears
to make certain there is no binding and that aU the gears shift properly .
• Install the parts removed in the reverse order of removal, and refer to
the appropriate chapters.
o Replace the O-ring on the output shah with a new one.
*
7-8 ENGINE BOTTOM END / TRANSMISSION
Crankshaft. Connecting Rod
Removal
e
•
•
e
Split the crankcase (see Crankcase Splitting) .
Remove the transmission shafts (see Transmission Shaft Removal).
Using 8 press, remove the crankshaft from the right crankcase.
lf the bearings stay on the crankshaft when splitting the crankcase or
removing the crankshaft from the right crankcase, remove the bearings
from the crankshaft with a bearing puller [A] and adapter [ BJ.
Specia l Tool - Be.rlng Puller: 57001 -158 [AJ
Bearing Puller Adapter: 5700' -136 [ B]
Installation Notes
. When installing the crankshaft bearings, apply high temperature grease
to the outer sides of the bearings. and then press them into the
crankcase using the bearing driver [AJ until the bearing bottoms
against the step.
Special Toof - a.arlng Drive, Set 5700' -1129 [AJ
• Insert the crankshaft jig [A] between the crankshaft ftywheels opposite
t he connecting rod big end to protect flywheel alignment as shown,
and press the crankshaft into the right crankcase.
O When pressing, position the jig in t he crankcase opening so the jig
does not hit the crankcase.
Special Tool - Crankshaft Jig: 57001 ·1174 [A]
. Apply 2·sttoke oil to the connecting rod big end bearing.
Disassembly Note
Since assembly of the crankshaft demands exacting tolerances, the
disassembly and reassembly of the crankshaft can only be done by a
shop having t he necessary tools and equipment.
e lf it should be necessary to disassemble t he crankshaft, use a press to
remove the crankpin .
•
8
ENGINE BOTTOM END / TRANSMISSION 7 -9
Assembly Notes
Since the assembly of the crankshaft demands exacting tolerances,
the disassembly and reassembly of the crankshaft can only be done by a
shop having the necessary lools and eqUIpment
• Reassemble the crankshaft accordmg 10 the standard tolerances in
SpeclftcatlOns
OConnectlng rod bend, tWist
oConnecling rod big end radial clearance.
OCold -filting tolerance between crankpln and flywheels.
OSide clearance between the connectmg rod big end and one of
flywheels
O Crankshah (unout
Connecting Rod Big End Radial Clearance
e Set the crankshaft In a flywheel alignment jig or on V blocks, and place
a dial gauge agalnsllhe connecting rod big end .
• Push the connecting rod first towards the gauge and then in the
opposite direction The difference between th e two gauge readings IS
the radial clearance
* If the radial clearance exceeds the service limit, the crankshaft should
be either replaced or disassembled and the crankpln, needle bearing,
and connecting rod big end examined for wear.
Connecting Rod Big End Radial CNtar.nee
Standard:
10:125: 0.026 .... 0.043 mm
KX250: 0.037 _ 0.049 mm
KX125: 0.09 mm
Sel"la Limit:
KX25O:0.10mm
Connecting Rod Big End Seizure
* In case of serious seizure with damaged flywheels, the crankshaft must
be replaced.
* In case 01 less seriOUS damage, dISassemble the crankshaft and replace
the crankpin, needle bearing, side washers, and connecting rod.
Connecting Rod Big End Side Clearance
• Measure th e side clearan ce [Al 01 the connecting rod with a thickness
gauge.
II the clearance exceeds the service limit, replace the crankshaft.
*
Connecting Rod Big End SkkI Clearance
Standard:
10:125 - 0.40 - 0.50 mm
KX250 - 0 .45 _ 0.55 mm
0.70mm
Sel"llce Lim it:
-,[email protected]
-
III
I~
ICX:C::
I
-
-
7 -10 ENGINE BOTTOM END / TRANSMISSION
Crankshaft Runout
('
e Sel the crankshaft in a flywheel alignment Jig or on V blocks, and place
a dial gauge against the points indicated .
• Turn the crankshaft slowly.
* If the
I,
runout at either point exceeds the service limit. align the
T~'"
flywheels so that the runout falls within the service limit.
Crankshaft Runout
Standard:
Servk:e lImtt
~
The maximum difference in gauge
readings is the cran kshaft runout.
)
~I
lho ".nl .... h
>I""'l~
~
Not mOf'e than 0.03 mm
0.05 mm
(A) : KX125 - 8.0 mm
KX250 - 8.5 mm
Crankshaft Alignment
.In the case of horizontal misalignment which is the most common,
strike the projecting rim of the flywheel with a plastic, soft lead, or
brass hammer as indicated in the figure .
• Recheck the runout with a dial gauge, repeating the process until the
runout falls w ithin the service lim it.
OVen:ical misalignment is corrected either by d riving a wedge in
between the flywheels or by squeezing the flywheel rims in a vise,
depending on the nature of the misalignment. In cases of both
horizontal and vertical misalignment, correct the horizontal mIsalign ment first.
I
Don" homme''''
'tywhea'" ~N
¢
* If flywheel misalignment cannot be corrected by the above method,
:J:P
replace the crankpin or the crankshah itself.
0
p:n
Cl
D
f=P'
A
¢
t::tn
ENG INE BOTTOM END / TRANSMISSION 7 -11
Transmission
Shaft Removal
. Split the crankcase (see Crankcase Splitting) .
• Pull out the shift rods fA), and disengage the shift fork guide pins from
the shift drum grooves.
• Remove the shih drum [B] .
• Remove the shih forks (C] from the transmission gears.
• Take out the drive shaft [0] and output shah [El togethef, with their
gears meshed.
Shaft Installation Noles
• Hold the dflve shaft [A] and output shaft [ B] together, with their gears
meshed, and fit them int o the right crankcase half.
• To install the shift forks and shift drum, see the Shift Drum and Fork
Installation Notes
Shaft Disassembly Note
• USing clrclip pliers to remove the clrdips, d isassemble the transmission
shah.
Special Tool - Outside Clrclip Pliers: 57001·144
Shaft Assembly Notes
. Apply transmission oil liberally to the transmission shaft, gears and
bearings.
• Replace any clrclips that were removed w ith new ones.
OAlways install circlips [ A ] so that the opening [B] is aligned with a
spline groove eel , and install toothed washers [0] so that the teeth
[ E] are not aligned with the circlip opening [B]. To install a clrchp
without damage, first fit the circlip onto the shaft expanding it just
&nough to install it. and then use a suitable gear to push Ihe circlip inlo
place.
Special Tool - Outskle Clrclip Pile,..: 57001·144
7-12 EN GINE BOTTO M END / TRANSMIS S ION
. The drive shah gears can be identified bV size; the smallest diameter
gear is 1s1 gear, and the largest is 5th (KX250) or 6th (KX125) . Be
KX125 :
sure that all pans are put back in the correct sequence, and facing the
proper direction, and that all circlips and the washers are properly in
place.
KX125:
A. 1st gear
B. 6th gear
C. 3rd/ 41h gear
O. 5th gear
(2ST; plain side faces right)
(20T/ 22T; larger gear faces right)
(24T; has an identifying groove)
(14T; pan of drive shah)
E. 2nd gear
(14T; chamfered side faces right)
KX250:
C. 3rd gear
<15T; part of drive shah)
(24T; dog recesses face left)
(18T; fork groove goes to the left side of the gear
D. 4th gear
E. 2nd gear
teeth)
(22T; dog recesses lace right)
(16T; chamfered side faces right)
A. 1st gear
B. 5th gear
. The output shaft gears can be identified by size; the largest diameter
gear is 1st gear, and the smallest is 5th ( KX250) or 6th (KX125). Be
sura t hat all parts are put back in the COrTect sequence and facing the
proper direction, and that all circlips and washers are properlv in place.
10:125:
A 2nd gear
B. 5th gear
C. 3rd gear
D. 4th gear
E. 6t h gear
F. 1st gear
(24T; dog recesses face right)
( 25T; fork groove goes to the right side of the gear
teeth)
(28T; dog recesses face left)
(26T; dog recesses face right)
(23T; fork groove goes to the left side of the gear
teeth)
(JOT; plain side faces right)
KX250:
A. 2nd gear
B. 4th gear
C. 3rd gear
D. 5th gear
E. 1 Sl gear
(27T; plain side faces left)
(25T; fork groove goes to the right side of the gear
teeth)
(25T; dog recesses face left)
(24T; dog recesses face right)
(32T; dog recesses face left)
. Check that each gear spins or slides freelv on the transmission shaft
with out binding after assemblv.
KX250 :
KX125:
KX2 50 :
ENGINE BOTTOM END / TRANSMISSION 7-13
Shift Drum and Fork Installation Notes
. ApplVa little transmission oil to the shift fork ears, and fit the shift forks
into the gear grooves.
Shift Fork Idenlilicatlon
KX125:
Drive shaft 3rd gear and 4th
gear shih fork [Al
ears are shorter than those
of the other two shift forks
Output shaft 5th gear
guide pin goes to left side of t he
shift fork [B ]
"ffi
Output shaft 6th gear
shift fork [C]
guide pin goes to right side
of the ears
©
©
®
®
KX2S0:
Drive shaft 3rd gear shift
fork [A)
ears are shorter than those
of t he ot her two shift forks
Output shaft 4th gear
shift fork [B)
guide pin goes to left side of the
Output shaft 5th gear
shift fork [el
"ffi
guide pin goes to center
®
©
®
. Torque the shift drum bearing retaining bolts.
Torque - Shift Drum Bearing Retaining Bolts: 8.8 Nom (0.9 kg-rn, 78
In.lb)
. Fit the shih fori< guide pins into the corresponding shift drum g rooves.
• Torque the shift drum operat ing plate bolt.
•
Torque - Shift Drum OperatIng Plate Bolt 22 N-m (2.2 kg-m, 16 ft·lb)
. Applya linle transmission oil to the shift rod, and slide it into the shi ft
forks.
®
®
©
Shift Fork Bending
. Visually inspect the shift forks, and replace any fork that is bent. A bent
fork could cause difficulty in shifting, or allow the transmission to jump
out of gear when under power.
A. goo
-
7 -14 ENGINE BOTTOM END / TRANSMISSION
Shift Fork/ Gear Groove Wear
• Measure the thickness afthe shift fork ears [AJ , and measure the width
[ 8 ) of the shift fork grooves in the transmission gears.
* If the thickness of a shih fork ear is less than the service limit, th e shift
fork must be replaced.
Shift Fof1t Ear thickn • ••
5l11ndard:
KX1 25
KX250
KX125
Senile. limit:
KX250
- 3.9 ... 4.0 mm
- 4.4 - 4.5 mm
- 3.8 mm
- 4.3 mm
* If a gear shift fork groove is worn over the service limit, the gear must
be replaced.
Gear Shift Forti: Groove Width
Stand.rd:
KX125
KX250
KX125
KX2S0
-
4.05 .... 4.15 mm
4.55 .... 4.65 mm
4.25mm
4.75 mm
Shift Fork Guide Pin/ Shift Drum Groove Wear
. Measure the diameter [AJ of each shift fork guide pin, and measure the
width [ 8 ] of each shih drum groove.
* If th e guide pin on anv shift fork is less t han the service limit. the fork
must be replaced.
Shift Fort Guide Pin DlIm... r
5.10 .... 8.00 mm
Standard:
Service Limit
5.80 mm
* If any shift drum groove is worn over the service limit t he d rum must
be replaced.
ShMt Drum Groove Width
SUndlrd:
5erYk:tI Limit
6.05 - 6.20 mm
' .25mm
Gear Damage
. Visually inspect the gear teeth on the tra nsmission gears.
* Repair lightly damaged gear teeth with an oilstone. The gear must be
replaced if the teeth are badly damaged.
*At the same time that 8 gear is repaired or replaced, the d riving gear
should also be inspected and repaired o r replaced if necessary.
ENGINE BOTTOM END / TRANSMISSION 7 -15
Gear Dog/ Gear Dog Hole Damage
. Visually inspect the gear dogs [A] and gear dog holes [B].
* Replace any damaged gears or gears with excessively worn dogs or
dog holes.
Ball Bearing Wear
• Check Ihe ball bearings in the crankcase.
OSince the ball bearings are made to extremely close tolerances, the
wear must be judged by feel rather than measurement. Clean each
bearing in a high flash-point solvent, dry it (do not spin the bearing
while il is dry), and oil it with transmission oil.
o Spin the bearing by hand to check its condition.
the bearing is noisy, does not spin smoothly, or has any rough spots,
replace it.
*11
WH EELS/ TIRES 8-1
Wheels/Tires
Table of Contents
Exploded View "'" .....................................................................................................8-2
Spec ifications ........................... ........................................................
. ................ 8 -3
Wheels ( Rims) ............................................................................................................8 -4
Front Wheel Removal .............................................................................................8 -4
Front Wheel Installation Notes ...............................................................................8 -4
Rear Wheel Removal ..............................................................................................8-5
Rear Wheel Installation Notes ..............................................................................8 -5
Inspection ................................................................................................................8 -6
Spoke Inspection .................................................................................................... 8- 7
Rim Inspection ........................................................................................................8-7
Axle Inspection .......................................................................................................8 -7
Tires ... ..........................................................................................................................8 -8
Air Pressure Inspection/ Adjustment .......................................................................8-8
Inspection ........ ................
................... ......................... ............................... 8 -8
Removal ...............................................................................
.....................8-9
Installation Notes ....................................................................................................8-9
Hub 8earings ...........................................................................................................8-10
Removal Notes .....................................................................................................8 -10
Installation Notes ..................................
...........................................................8 - 10
Inspection .................... .....................
........ .......................... ..................... 8-10
8-2 WH EELS / TI R ES
Exploded View
1. Nipple
2. Spoke
3. Front Tlr.
•
A..
,. From Ax ..
. : Pivot Shaft
7. Swing Ann
8 Rear 11 ...
. R•• r Ade
9.
10 Front Axle
Clamp
T1 '1 .SH-m(O.1S
~ft.lb)
kg-m 13 tt-Ib)
T2 : 54 N..m (5.5 kg.m, 82 In.lbl
: 9.3 N-m (0.95 kg-m, ft-Ib)
T3
T4 .: 98 N-m (10 kg-m, 72
WHEELS / TIRES 8 - 3
Specifications
Standard
Item
Wheels (Rims) :
Rim ru nout:
Axial
Radial
Axle runout / 1 00 mm
Under 0 .5 mm
Under 0 .8 mm
Under 0 .10 mm
Service limit
2mm
2mm
0.2 mm
Tires:
Standard tire:
10(125,
Front:
Rear:
---
Make
Type
80/1 00-21 51 M
DUNLOP
K490, Tube ( E) 0752. Tube
100/ 90 -19 57 M
DUNLOP
K695, Tube ( E) 0752. Tube
Size
80 /100·21 51 M
---
Make
Type
DUNLOP
K490, Tube ( E) D752. Tube
Size
110/ 90 · 19 62 M
Make
Type
DUNLOP
K695. Tube (El 0752. Tube
Size
Make
Type
Size
---
KX250,
Front:
Rear:
( E): European Model
Special Tools - InskMI Clrcllp Pliers: 57001-143
Rim Protector: 57001-1063
Bead Breaker Auembly: 57001 -1072
a ••rlng DrIVe' Set 57001 -1129
Jack: 57001-1238
---
8 -4 WHEElS/ TIRES
Wheels (Rims)
Front Wheel Removal
. Using the jack fA] under the frame, and stabilize the motorcycle.
Special Tool - Jaca: 57001 -1238 [A]
• Place a stand under the engine to raise the front wheel off the ground.
• Remove t he front disc cover.
a loosen the right axle clamp nuts (B) , remove the axle [ A] . and pull
out the wheel.
aTake off the collar [C} and cap [ 0 ] from each side of the fron t hu b.
CAUTlON
Do not lay the whetil on the ground with the disc lacing down. This
can damage or warp the disc. Place block. under the wheel 10 the
disc does not louch the ground.
elnsert a wood wedge between the disc brake pads. This prevents them
from being moved out of their proper position, should the brake lever
be squeezed accidentally.
Front Whee/Installation Notes
. Fit the projection (A] on the cap 10 the groove (8 ] on the collar.
a Install the collars on the leh and right side of the hub .
• Torque the axle
Torque
~
fAJ.
Front Axle: 54 N...m (5.5 kg...m, 40 It· lb)
. Tighten the upper clamp nuts (8] first, and then tighten the lower
clamp nuts [C).
To~ ~
Clamp Nut : 9.3 H-m (0.95 kg-m, 82 In-Ib)
WHEELS / TIRES 8-5
AWARNING
00 nol attempt 10 drive the motorcycle until a
tun
brake lever ,.
obtained by pumping the brake 'ever unltllhe pads are against the
disc. The brake wilt nol tuncllon on the first application of the lever
If this I. nol done.
Rear Wheel Removal
• Use the jack under the frame so that the rear wheel is raised off the
ground.
Special Tool - Jack: 57001-1238
• Remove the caliper cover, unscrew the caliper mounting boils [ B] , and
remove the caliper [AJ from the disc.
e lnsert a wood wedge between the brake pads thIs prevents them from
being moved out of their proper position, should the brake pedal be
squeezed accidentallv .
• Remove the clip [8] from the master link using pliers. and free thadrive
chain [ AJ from the rear sprocket.
. Remove the coner pin [A] .
• Remove the axle nut [BJ .
• Pull Qut the axle [C], and remove the chain adjuster, brake holder, and
rear wheel.
. Take off the collar and cap from the each side of the rear hub.
CAlITlON
Do not lay the wheel on the ground with the
dl~
facing down. Thla
can damage or warp the disc. Place blocks under the wheel so the
disc doft not touch the ground.
Rear Wheel Installation Notes
. Fit the brake holder stop [A] against the swing arm stop ( 8 ].
8 -6 WHEELS / TIRES
• Fit the projection on the cap to the groove on the collar.
• Install the collars [Al on the left and right side of the hub.
• Install the drive chain. Install the master link clip [AJ so that the closed
end of the " U " points in the direction of chain rotation [ 8] .
e Check the drive chain slack (see Drive Chain Slack Inspection in the
Final Drive chapter) .
• Torque the axle nut and caliper mounting botts.
Torque - Rear Axle Nut 98 N·m (10 kg-m, 72 tt.lb)
neaf Caliper Mounllng Bolts: 25 N-m (2.5 kg-m, 18 tt·lb)
. Install the new coner pin .
• Check the fear brake for good braking power and no brake drag .
.." WARN IN G
Do not attempt to drive the motorcyde until a full brake pedal II
obtained by pumping the brake pedal until the pad, are agalnlt the
disc. The brake will not funcUon on the lirat app/k:allon 01 the pedal
H
tI not clone,
"'Is
Inspection
.Place the jack under the frame so thaI the fronl/rear wheel is raised off
the ground.
Special Tool - Jack: 57001-1238
e Spin the wheel lightly, and check for roughness or binding.
* If roughness or binding is found, replace the hub bearings.
e Visual1y inspect the front and rear axles for damage.
* If an axle is damaged or bem. replace it.
WHEELS / TIRES 8-7
Spoke Inspection
e Check that all the spokes are tightened evenly
* If spoke tightness 15 uneven or loose, torque the spoke nipples evenly
Torque - Spoke Nipples: 1.5 N-m (0.15 kg-m, 13 In-Ib)
• Check the rim runout.
,iIt.WARNING
" any spoke breaks, It should be replaced immediately. A mi"'ng
lpoI(e place. an additional load on the other spokes, which will
eventually caul. other spokes to break.
Rim Inspection
ePlace the jack under the frame so that the front / rear wheet is off the
ground.
SpecIal Tool - Jack: 57001-1238
• Inspect the rim for small cracks, denis, bending, or warping.
there is any damage to the rim, II must be replaced .
*"
• Set a dial gauge against the side of the rim, and fO l ate the rim 10
measure the 8)(181 runout [AI, The difference between the highest and
lowest dial readings IS the amount of runout.
• Set a dial gauge against the outer circumference of the rim, and rotate
the rim to measure radial runout [ 8]. The d ifference between the
highest and lowest dial readings is the amount of runout.
If rim runout exceeds the service limit, check the wheel bearings first
Replace t hem if they are damaged. If the problem is not due to the
bearings, correct the rim warp (runout) . A cenain amount of rim warp
can be corrected by recentering the rim. loosen some spokes and
tighten others within the standard torque to change the position of
different pans of the rim. If the rim is badly ben t, however, It must be
replaced.
"*
Rim Runout (with lire Inltalled)
Standard
Service lim it
Axial
under 0.5 mm
2mm
Radial
under 0.8 mm
2mm
Axle Inspection
. Place the axle in V blocks that afe 100 mm [AJ apart, and set a dial
gauge on the axle al a point halfway between the blocks. Tum the axle
to measure the runout. The difference between t he highest and lowest
dial read ings IS the amoun t of runout.
* If runout exceeds the service limit, replace the axle.
Axle Runoutll00 mm
Standard:
Under 0.10 mm
Service Limit:
0.2 mm
Cc
1
8-8 WHEELS/TIRES
Tires
Air Pressure Inspection/Adjustment
. Using a lire air pressure gauge [A], measure the tire pressure when the
tires are cold.
*Adjusl the tire air pressure 10 s uillrack conditions and rider preference.
but do not stray too far from t he recommended pressure.
Track Condition
Tire Pressure
O When the track is wet. muddy, sandy
or slippery, reduce the tire pressure to
increase the tire tread surface on the
ground.
o When the track is pebbly or hard,
increase the tire pressure to prevent
80 kPa (O.B
kg /em', 11 psi)
damage or punctures, though the tires
will skid more easily.
kg /em', 14 psi)
I
l00kPa (1.0
Inspection
As the tire tread wears down, the l ire becomes more su sceptibl e to
puncture and failure .
• Remove any imbedded stones or other foreign particles from the tread .
• Visually inspect the tire for cracks and cuts, replacing the tire in case
of bad damage. Swelling or high spots indicate internal damage,
requiring tire replacemerlt.
To ensure safe handling and stability, un only the recommended
standard Ilres lor replacement, Intlated 10 the standard pressure.
NOTE
O Check and balance the whee/ when 8 tire is lep/aced with a new one.
Standard Tire
KXl25:
F,on<
Size:
Make:
Type:
80/100-21 51M
DUNLOP
K490, Tube (E) 0752, Tube
Rear:
Size:
Make:
Type:
100/90·19 57M
DUNLOP
K695, Tube (E) 0752, Tube
KX250:
F~t
Size:
Make:
Type:
80/100-21 51M
DUNLOP
K490, Tube (E) 0752, Tube
Rear:
Size:
Make:
Type:
(E) : European Model
110/90-19 82M
DUNLOP
K695, Tube (E) 0752, Tube
WHEELS / TIRES 8-9
Removal
CAlITlON
00 nol lay the wheelan the ground with the disc facing down. This
can damage or warp the disc. Place blocks under the wheel ao the
d isc does nol touch the ground.
• Remove the wheel from the motorcycle (see Wheels) .
e Ta maintain wheel balance, mark [AJ the valva stem position on the
lire with chalk so that the tire can be reinstalled In the same position .
• Take out the valve core [ 8] 10 let out the alf.
O When handling the nm. be careful nOl to damage the rim flanges .
• loosen the bead protector nut.
• lubricate the we beads and nm flanges on both sides with a soap and
waler solution or rubber lubricant. This helps the we beads slip off the
rim flanges.
CAUTION
Never lubricate with mineral 011 (engine 011) or gasoline because they
will cause deterioration of the tire.
• Break the beads away from both sides of the rim With the bead breaker
(AJ .
Special Tool - Bead Sreaker Assembty: 57001·1072 [A]
• Protecting t he rim With rim protectors [A], pry the
we off.
Special TO<» - Rim ProtectOf': 57001 · 1063 [A]
Tlr. Iron PorUon of the Bead 8reaker Asumbty:
57001·1072 [8 ]
Installation Notes
• Position the tire on the rim so that the valve is 81 the tire balance mark
[A] (the chalk mart. made during removal or the yellow pamt mart. on
a new tire) .
. Tighten the bead protector nut securely.
• Check and adjust the air pressure after installing.


-.JI.-~-.,
8-10 WHEElS / TIRES
Hub Bearings
Removal Notes
CAlJTION
Do not lay the wheel on the ground with the disc lacing down. This
can damage
Of'
warp the dlK. Place bloch under the wheel so thai
the disc does not touch the ground .
• Remove the hub bearing by lapping evenly around the bearing inner
race as shown.
A Bar
B. Distance Collar
C. Hub Bearing
Installation Notes
• Before installing the wheel bearings, blow any dirt ar foreign particles
out of the hub with compressed air to prevent contamination of the
bearings.
e Replace the bearings with new ones.
e lubricate them and install them using the bearing driver set [AJ so that
t he' marked or shielded sides face out.
Special Tool - Be.rWlg Driver Set 57001 ·1 129 [AJ
• Replace the oil seals with new ones.
• Press it in until it stops at the circlip in the hole using the same special
tools used for bearing installation
Inspection
NOTE
OIl is not necessary to remove any bearings (or inspection. If any
bearings ate remov8d, they will need to be replaced with new ones .
• Spin it by hand to check its condition.
*If it is noisy, does not spin smoothly, or has any rough spots, it must
be replaced.
• Examine the bearing seal for tears or leakage.
If t he seal is torn or is leaking, replace the bearing.
*
FINAL DRIVE 9 -1
Final Drive
Table of Contents
Exploded View .................. .......................................................................................9-2
Specifications ......................
........................... ............. ........................................ 9 - 3
Drive Chain ............................................................................................................. .. .9 -4
Slack Inspection ...................................................................................................9-4
Slack Adjustment ...... .. ...........
. .. ................. . .... ....... ... ......................... ........... 9·4
Wheel Alignment Inspection .................................................................................9-5
Wheel Alignment Adjustment ................................................................................9-5
Wear Inspection ...... ...... ............. .... ............ ...... ........................... ........... ......... .... 9-5
lubrication ....................... ...................................................................... ............ .. ..9 -6
Removal ........................................................ .................... ...................................... 9-6
Installation Notes .................................................................. ....................... .......... .9 -6
Sprockets ..... .......... .......... .... .................. .. ....................... .. .........................................9-7
Engine Sprocket Removal .............
.. ...... ... ... ..................................................9 -7
Eng ine Sprocket Installation Note ..................................... ..................................... 9 -7
Rear Sprocket Removal ..........................................................................................9- 7
Rear Sprocket Installation Notes ................. .......... ...... .......... ................... ....... ....... 9 -7
Wear Inspection ...................................................................................................9-7
Warp Inspection ......... ... ................... ........................................................ ............. .. 9-8
9-2 FINAL DRIVE
Exploded View
~
/
/
/
I
I
I
I
I
I
--'
/
/
/
/
T•
v~
T2
~
~~
()
1. Engine Sprocket
2. Output Shaft
3. Pivot Shaft
••
Chain Guide
••
7. Lodcnut
Swing Ann
5. Chain Slipper
8. Adjusting BoN
9. Chllin AdJuste,
10. Drive Chain
'1 . R•• r5pn)ckel
12. Rear Axle
o : Apply 011 •
n : 29 H-m (3 kg-m , 22 ft-Ib)
T2 : 98 N..m (10 kg-m, 72 tt-Ib)
FINAL DRIVE 9-3
Specific ati ons
Item
Sta ndard
Drive Cha in :
Chain slack
50 - 60mm
317.5 mm - 318.2 mm
Chain 20 -li nk length
Standard Chain :
Make:
Type:
DAIDO
0 .1.052005 -6
(El 0.1.052005·5
D.I.D 520 DS
112 link
114 links
KX'25
KX250
Length :
KX'25
KX250
Service limit
Less than 50 mm, or
more than 65 mm
323mm
-----------
Sprockets :
Engine sprocket diameter:
KX125
KX250
Rear sprocket diameter
Rear sprocket warp
50.98 - Sl.18mm / 12T
60.99 - 61.19 mm/14T
237.54 - 238.04 mm/ 49T
Under 0.4 mrn
(E) : European Model
Special Tools - Outside Clrcllp Pliers: 57001-144
Bearing Driver Set 57001·1129
J ack: 57001 ·1238
50.7 mm
60 .7 mm
237.0 mm
0 .5 mm
9 -4 FINAL DRIVE
Drive Cha in
Slack Inspection
. Support the motorcycle on its side stand .
• Check the whee! alignment (see Whee! Alignment Inspection) , and
adjust it if necessary (see Wheel Alignment Adjustment) .
NOTE
oClean the drive chain if it is dirty, and lubricate it if it appears dry .
• Rotate the rear wheel to find the position where the chain is tightest.
. Measure the space (chain slack) [A] between the chain and the swing
arm at the rear of the chain slipper as shown.
* If the drive chain slack exceeds the standard, adjust it.
Chain Slack
Standard;
Usable Ra~:
SO- 60mm
50 _ 65 mm
Slack Adjustment
• Loosen the left and right chain adjuster locknuts [C).
• Remove the cotter pin [F] and loosen the axle nut [A].
If the chain is too tight, back out the left and right chain adjusting bolls
[B] evenly, and kick the wheel forward until the chain is too loose.
*If the chain is too loose, turn both chain adjusting bolts [B] evenly
until the drive chain has the correct amount of slack. To keep the chain
and wheel properly aligned, t he notch [E] on the left chain adjuster
should align with the same swing arm marie; [D] as the right chain
adjuster notch .
*
• Check the wheel alignment.
. Tighten both chain adjuster locknuts securely .
• Tighten the axle nut.
Torque - Rear AIle Nut: 98 N· m (10.0 kg..,.., 72 tt·lb)
• Rotate the w heel. measure the chain slack again at the tightest
position, and readjust if necessary.
• Install a new cotter pin through the axle nut and axle, and spread its
ends.
" the axle nut Is not securely tightened, or the cotter pin
Installed, an unsafe riding condition may resull
. Check the rear brake (see the Brakes chapter).
NOTE
Oln wet and muddy conditions, mud sticks to the chain and sprockets
resulting in an overly tight chain, and the chain may break. To
prevent this, adjust the chain to 55 - 65 mm of slack whenever
necessary.
FINAL DRIVE 9· 5
Wheel Alignment Inspection
. Check that the nOlch [Al on th e left chain adjuster [ BJ aligns w ith the
same swing arm mark as the right chain adjuster.
NOTE
o Wheel alignment can also be chec*ed using the straightedge or
stfing method.
Misalignment 01 the wheel will result in abnormal wear, and may
result In an unsafe riding condition.
Wheel Alignment Adjustment
This procedure is the same as Drive Chain Slack Adjustment.
Wear Inspection
.Rotate t he rear wheel to inspect the drive chain fOf damaged rollers,
and loose pins and links.
* If there is any irregularity. replace the drive chain.
"' Lubricate the drive chain if it appears dry .
• Stretch the chain taut by hanging a 98 N (10kg, 201b) weighl [AJ on
the chain .
• Measure [Bl the length of 20 links on t he straight part of t he chain
from the pin cen ter of the 1st pin to the pin cen ter of t he 21st pin .
Since the ch ain may wear unevenly, take measurem ents at several
places.
* If any measurements exceed the service limit, replace the chain.
Also,
replace t he front and rear sprockets when the drive chain is replaced.
Chain 2O-llnk length
Standard:
317.S mm - 318.2 mm
323mm
Service Lim":
."WARNING
tf the drive chain wear exceeds the service limit, replace the chain
or an unsafe riding cond"lon may result A chain that breaks or
lumps off the sprockets could snag on the engine sprocket or Iodl the
rear wheel, severely damaging the motorcycle and causing il to go
out of control.
Standard Chain
Meke:
OAIDO
Type:
KX125 -
LInk:
KX250 KX125 KX2SO -
0.1.052005-6
{EI 0 .1.0 520 05-S
0.1.052005
112 LInks
114 LInks
{EI : EUropean Mode'
.~ .~
~' i
101 2nd 3 , d
®~
2011> 2111
9-6 FINAL DRIVE
Lubrication
e lf the chain appears especially dirty, it should be cleaned before
lubrication with high flash~point solvent.
e Applyoil [AJ to the sides of the rollers so that oil will penetrate to the
rollers and bushings.
e Wipe off any excess oil.
Removal
• Remove the engine sprocket cover .
• Remove the clip (Al from the master link using pliers, and free the drive
chain from the rear sprocket .
• Remove the drive chain from the chassis.
Installation Notes
• Fit the drive chain back onto the sprockets with the ends at the rear
sprocket.
e lnstallthe master link from the frame side.
• Install the clip (AJ so that the closed end of the ·U· points in the
direction of chain rotation [8J.
e Adjust the drive chain slack (see Drive Chain Slack Adjustment) .
• Check the rear brake (see the Brakes chapter) .
FINAL DRIVE 9-7
Sprockets
Engine Sprocket Remo val
• Remove:
Engine Sprocket Cover
Drive Chain (free of engine sprocket )
• Remove the circlip [A]. and pull off the engine sprocket [B).
Special Tool - Outside ClrcUp PUers: 57001-144
Engine Sprocket Installation Note
• Replace the circlip with a new one.
• For KX125 model; install the sprocket so that the chamfered side (A]
faces in.
Special Tool - Outside ClrcUp Pllertl: 57001-144
Rear Sprocket Removal
• Remove the rear wheel (see Rear Wheel Removal in the Wheels/Tires
chapter) .
CAUTlON
Th.
Do not lay the wheel on the ground with the disc lacing down.
ean damage or warp the disc. Place block, under the wheel so that
the disc does not touch the ground.
• Unscrew the rear sprocket boilS [C]. and remove the rear sprocket
[AJ.
Rear Sprocket Installation Notes
. lnstal1the rear sprocket [A] so that the marked side [ B) faces out.
. Tighten t he rear sprocket boilS.
Torque - Rear Sprodtet Bolts: 29 N-m (3.0 kg-m, 22 ft-Ib)
Wear Inspection
. Visually inspect the front and rear sprocket tooth for wear and damage.
If they are wom as illustrated or damaged, replace the sprocket.
*
A. Worn Tooth ( Engine Sprocket)
B. Worn Tooth (Rear Sprocket )
C. Direction of Rotation
A
,
'"
-'
,
,,
,,
,
9 -8 FINAL DRIVE
• Measure the diameter of the sprocket 8t the base of the teeth.
*If the sprocket is worn down to less than the service limit rep lace the
sprocket.
Englntl Sprodcet Diameter
KX125 :
Standard:
Service Limit
KX250 :
Standard:
50.98 - 51.18 mm/12T
SO.7 mm
60.99 _ 61.19 mm/14T
Service Limit
60.7 mm
Rear Sprocket Dlameler
Standard:
237.54 - 238.04 mml49T
237.0 mm
Service Limit:
NOTE
O ff II sprocket requires replacement, the chain is probably worn also.
When replacing II sprocket. inspect the chain.
Warp Inspection
• Using the jack. raise the rear wheel off t he ground.
Special Tool - Jack: 57001-1238
. Set a d ial gauge [A] against the rear sprocket [8] near the teeth as
*
shown and rotate [e] the rear wheel. The difference between the
highest and lowest dial gauge readings is the amount of runou!
(warp) .
If the runout exceeds the service limit replace the rear sprocket.
Rear Sprocket Warp
SlrInclard:
Sef'¥iu Limit
Uncle, 0.4 mm
0.5 mm
~ () •
,~~
''Cr.",'
,
,
0
0
BRAKES 10-1
Brakes
Table of Contents
Exploded View ............................ " .... ......................... ............... ,.....
Specifications ............. ............. .......... ............. ..................... .. . ... ........ ......... .
........10-2
...10-4
Brake Lever, Brake Pedal.........................
... ..... ...........
. ... 10-5
Lever Play Adjustment ................................. ....................................................... 10-5
Pedal Positron/Adjustment.... . .....................
........................................... 10-5
Pedal Play Adjustment ............
.......................................... 10-5
Brake Flurd ... .................
.................................. 10-6
Level Inspection
...................
. .......... ...................... .........................10-6
Change. . .. ........ ...... ... ... .................. . .... .... ...
............ ..... ... ........ ... ....
. ..... , 0 -7
Bleeding the Brake Line
........................ ...................
.............. .. ... 10-8
Caliper ..... ........... .......
. ........................................ 10-9
Removal. .............. ..............
............................... ....
. ... .10-9
Installation Note ..............
........................................... 10-9
Disassembly ..........
.......... ....... .....................................................................10-10
Assembly Notes .....
........................................... ......................... ........ ... ..... 10-10
Brake Pads .................
............................ ............... .. .......... ...... 10-12
Removal. ....... ..
..............
............................................................... 10-12
Installation Notes............
........................ .................................. ............. 10-1 2
........ ... ... ....
. ........................................... 1 0 - 12
Inspection...
Master Cylinder..
............................. ............................................................ 10- 13
Front Master Cylinder Removal .......................... ....... ............ .......................... 10-13
Front Master Cylinder Installation Notes ............... .. .........................................10- 13
Rear Master Cylinder Removal ...........................
.............................. 10- 13
Rear Master Cylinder Installation Notes .............
. ............ ....................10-14
Front Master Cylinder Disassembly .......................................................... .. .... .. 10-14
Rear Master Cylinder Disassembly..... ......................
. ... .................... 10-14
Assembly Notes . ... .... ........ ..... ....... .... ..........
...... ....... . ................ .......... 1 0 - 1 5
Inspection (Visual Inspection ) ........................ . ... .... ......
.............................. 10-1 5
Brake Disc .... .......................................
.... ... .... .....
.............................. 10-16
Inspection ................... ... ...........
.................
...................... 10-16
Brake Hose ..........................................................................................................10-17
Removal/ Installation Notes ...........
.............
. ... ... ....10- 17
Inspection .................................................................... ................. .. ........ .......... 10-17
10-2 BRAKES
Exploded View
Front Disc Brake
5
#I
,.Jf~
~ ~.
cA5 %~ ·
1.
2.
3.
4.
Front Brake Rel .Nolr
Brake Lever
Brake Lever Adjuster
Locknut
5. Brake Hose
Clamp
7. Front Caliper
Brake Pad
••
••
••
Piston
10. Front Disc
H : Apply poly butyl cuprysll greas• .
T1 ! 25 N-m (2.5 kg-m, 18.0 ft-Ib)
T2 : 8.8 Nom (0.9 kg-m, 78 In.lb)
T3 : 7.8 N-m (0.8 kg.m, 691n-lb)
T4 : 18 N-m (1.8 kg-m , 13.0tl-lb)
TS : 9.8 N-m (1 .0 kg-m, 87 In-Ib)
BRAK ES 10-3
Rear Disc Brake
o
,.
Rear Brake Reservoir
2. Rear Master Cylinder
3. Brake Hose
4. Brake Pedal
Rear Caliper Cover
Rear Caliper
7. Piston
Breke Pad
••
••
••
B. Rear Disc
Apply high temperature grease.
G
Apply poly butyl cuprysll grea••.
H
25 N-m (2.5 kg-m, 18.0 ft. lb)
T1
T2 : 8.8 N-m (0.9 kg-m, 78 in-Ib)
T3 , 7.8 N-m (0.8 kg-m , 69In-Ib)
T4 : 18 N-m (1 .8 kg-m, 13.0 ft- Ib)
15 : 9.8 N-m It .O kg-m , 87 In-Ib)
10-4 BRAKES
Specifications
Sta nda rd
Item
Brake Adjustment:
Lever play
Brake pedal position
Brake pedal play
Adjustable (to suit rider)
Adjustable (· 10 - 10 mm)
Adjustable (10 - 20 mm)
Brake Fluid :
Recommended disc brake fluid :
Type
Brand
O.O.T.3 or 0.0 T. 4
[D .D.T.3)
Atlas Extra Heavy Duty
Sheil Super Heavy Duty
Texaco Super Heavy Duty
Wagner Lockheed Heavy Duty
Castrol Girling -Universal
Castrol GT (LMA)
Castrol Disc Brake Fluid
[D.O.T.4 )
Castrol Girting-Universal
Castrol GT ( LMA)
Castrol Disc Brake Fluid
Check Shock Premium Heavy Duty
Brake Pads :
lining thickness:
Front
Rear
4.2mm
4.7mm
Front
2.85 - 3.15 mm
4.35 - 4.65 mm
Service Limit
---------
---
-----
-------
----------, mm
, mm
Brake Disc :
Thickness:
Rear
Runcut
Special Tools -
Not more than 0.12 rnm
Inside Clrcllp Pliers: 57001·143
Jack: 57001 ·1238
2.Smm
3.8mm
O.3mm
BRAKES 10- 5
Brake lever, Brake Pedal
Lever Play Adjustment
Adjust the front brake lever LA] to suit you .
• Loosen the adjuster locknut [ B] and turn the adjuster [C] to either
side .
• Aher adjustment. tighten the locknut.
Pedal Position/Adjustment
When the brake pedal [AJ is in rest position, it should be -10 - 10
mm (C] from the top of the footpeg ( B] . If it is not, adjust the pedal
position .
• loosen the locknut (AI. turn the adjusting bolt [ BJ, and then tighten
the locknut securely .
• Check the brake pedal play .
• Check the brake for good braking power, and no brake drag.
Pedal Play Adjustment
The brake pedal [C] has 10 - 20 mm (El of play when the pedal is
pushed down lightly by hand .
• Loosen the adjuster locknut [OJ and turn the adjuster [A] on the rear
master cylinder (8).
. After adjustment, tighten the locknut securely.
• Check the brake for good brake power, and no brake drag.
10-6 BRAKES
Brake Fluid
~·.WARNING
When wortlng with the disc brake, obterve the precautions listed
below.
1. Never reus. old brake fluid.
2. Do not u•• fluld 'rom • container thai hal been lett unse.,ed ortha!
has been open for a long lime.
3. 00 not mi. two types and brands of fluid tor use In the brake. this
lowers the brake fluid boiling point and could caul. the brake to
be Inetfeclh, •• It may .'10 cause the rubber brake parts 10 delerl-
orale.
4. Don'1 lea"e the reservoir cap of! lor any length of time to ."old
moisture contamination of the fluid.
5. Don' t change th.fluid In the rain or when 8 strong wind 1. blowing.
8. Except for the disc pads and disc, UI. only disc brake fluid,
Isopropyl .)cohol, Of ethyl alcohol tor cleaning brake paris. 00 not
un any other fluid for cleaning the •• partl. Gasoline, engine 011,
or any other petroleum distillate will cause deterioration of the
rubber parta. 011 spilled on any part will be difficult to wash oft
compkltely and will evantually deteriorate the rubber used In the
d1sc brake.
7. When handling the dille pads Of disc, be careful that no disc brake
fluid or any 011 geta on them. Claan ott any fluid or 011 that
Inadvertently gets on tha pads or dille with a high lIash-polnt
solvent Do not use one which wlllieava an oily rasJdUf!. Replaca
the pads with new ones "they cannot be cleaned satisfactorily.
8. Brakelluld quickly ruins painted suliaces; any spilled fluid should
be completely wiped up Immediately.
9. "an,. 01 the brake line fillings or the bleed valve's opened at any
time, the AIR MUST BE BLED FROM THE BRAKE.
Level Inspection
In accordance with the Periodic Maintenance Chart, inspect the brake
fluid level in the front and rear brake fluid reservoirs .
• Check the brake fluid level in the front brake reservoir [AI is more than
half full.
NOTE
o Hold the reservoir horizontal when checking brake fluid level.
• Remove the reservoi r guard and check the brake ftuid level in the rear
brake reservo ir [BI is between the upper [C] and the lower [ 0 ] level
lines.
* If the fluid level is lower than the lower level line, filt the
reset'IOU
to the
upper level line of the reservoir .
... WARNING
"the
Change the brat. fluklln the brake line complatety
brake fluid
mu.t be rttfliled but the type and brand 01 the brake fluid that alraady
Is In the rHervolr ara unldantNled. Aftar changing the lIuld, use only
the uma type and bf'and 01 fluid !heraaftar. MillIng dlnerent types
and brand 01 brake fluid Iowa,. the brake fluid boiling point and could
cause the braka to be lneffectlva. It may atao cause the rubber brake
patti to deteriorate.
BRAKES 10-7
NOTE
oBrake fluid of 0.0 T.4. is instalfed in the brake system when shipped.
Recomm ended Disc Brak e Fluid
Type:
0 .0 .T.3 or 0 .0 .1 .4
Brand:
[D.0 .T.3)
Alia s Extra Heavy Duty
Shell Super Heavy Duty
Texaco Super Heavy Duty
Wagner Lockheed Heavy Duty
Castrot Glrllng-Universal
Castrol GT (LMA)
Castrol Dlse Brake Fluid
[0 .0.1.4]
Castrol Glrllng - Universal
Castrol GT (L.MA)
castrol Disc Brake Fluid
Check Shock Premium Heavy Duty
Change
In accordance wit h the Periodic Mamtenance Chart, change the brake
fluid. The brake fluid should also be changed if it becomes contaminated
with dirt or waler. Furthermore, the brake fluid should be changed
whenever t he brake line parts are removed to bleed the air quickly and
completely,
NOTE
o The
procedure to change the front brake fluid IS as follows.
Changing the rear brake fluid is the same as for the front brake.
e
e
e
e
level the brake flUid reset'Voir.
Remove the reservoir cap .
Remove the rubber cap on the bleed valve [ A] .
Attach a clear plastic hose 10 the bleed valve on the caliper, and run the
other end of the hose into a container.
e Change the brake fluid as follows:
o Repeat this operat ion until fresh brake fluid comes out from the plastic
hose or the color of the fluid changes.
1 . Open the bleed valve [A].
2. ApplV the brake and hold it [ B].
3. Close the bleed valve [C).
4. Release the brake ( 0 )
NOTE
o The fluid level must be checked often during the changing operatJ·on
and replenished with fresh brake fluid. If the fluid in th~ reservoir
runs out any tJ·me during the changing operation. the brakes will
need to be bled since air will have entered the brake line.
e Remove the clear plastic hose.
e Tlghten the bleed valves, and install the rubber caps.
Torque - Caliper Bleed Valve: 7.8 N-m (0.8 kg-m, 69 In-tb)
e Aft er changing the fluid , check the brake for good braking power, no
brake drag, and no fluid leakage.
* 11 necessary, bleed th e air from the lines.
10-8 BRAKES
Bleeding the Brake Line
The brake fluid has a very low compression coefficient so that almost
all the movement of the brake lever or pedal is transmitted directlv to the
caliper for braking aClion . Air, however, is easily compressed. When air
enters the brake lines, brake lever or pedal movement will be partially
used in compressing the air. This will make the lever or pedal feel
spongy, and there will be a loss In braking power.
AWARNING
Be aura to bleed the air from the brake whenever brake lever or
pedal action leels soft or spongy, after the brake fluid I. changed, or
whenever a brake line fitting hal been loosened lor any reason.
NOTE
o The procedure to bleed the (ront brake line ;s as follows.
Bleeding
the rear brake line is the same as lor the ffont brake.
• Remove the reservoir cap, and check that there is pl8flty of fluid in the
reseI'Voir .
• With the reservoir cap off, slowly pump the brake lever severa l t imes
until no air bubbles can be seen rising up through the fluid from the
holes at the bottom of the reservoir.
o Bleed the air completely 'rom the master cylinder by this operation .
• Install the reservoir cap.
• Attach a clear plast ic hose to the bleed valve on th e caliper, and run the
other end of the hose into a container.
• Bleed the brake line and the caliper as follows:
o Repeat this operation until no more air can be seen coming out into
the plastic hose.
1. Pump the brake lever until it becomes hard, and apply th e brake
and hold it [AJ .
2. Quickly open and close the bleed valve while holding the brake
applied [8] .
3. Release the brake [C].
NOTE
o The lIuid level must b8 checked often during the bleeding operation
and replenished with fresh brake lIuid as necessary. If the lIuid in
th8 reservoir runs almost out any time during bleeding operation. the
bleeding operation must be done OV8r again from the beginning
since 8ir will have entered the line.
o Tap the brake hose lightly from the caliper to the reservoir for easier
bleeding.
• Remave the clear plastic hose.
• Tighten the bleed valves, and install the rubber caps.
TOf~
- Caliper B~ Valve: 7.11 H-m (0.11 kg-m, 69 In-Ib)
• Check the fluid level.
. After bleeding is done, check the brake for good braking power, no
brake drag. and no fluid leakage.
..
BRAKES 10-9
Caliper
Removal
• Remove the disc/caliper cover.
• Remove the front brake hose clamp mounllng bolts [ A J.
• Loosen the banjo bolt [A] at the brake hose lower end, and tighten it
looselV·
. Loosen the brake pad bolts [ E) before caliper removal if the caliper is
to be disassembled.
NOTE
0 1/ the caliper is to be disassembled after removal and compressed air
is not available, disassemble the caliper belore brake hose removal
(see Disassembly) .
• Unscrew the mounting bolts [ B], and detach the caliper [C] from the
disc
. Unscrew the banlO bolt and remove the brake hose [OJ from the
caliper (see Brake Hose Removai/ installation) .
CAIJT10N
Immedlalety wipe up any brake lIuld that spill•.
Installation Note
. Tighten the brake pad bolts if it was removed .
Torque - Brake Pad Bolli: 18 N-m (1.8 kg-m, 13 ft·lb)
. lnSlalithe caliper. and the brake hose lower end .
o Replace the washers that are on each side of the hose fitting with new
ones.
Torque - Caliper Mounting Bolta: 25 N-m (2.5 kg-m, 18.0 ft-Ibl
Brake Hose Banio Bolt 25 N-m (2.5 kg-m, 18.0 ft·lb)
• Bleed the brake line (see Bleeding the Brake Line) .
• Check the brake for good braking power, no brake drag, and no fluid
leakage.
.. .. WARNING
.r.
00 not aHempt to drive the motorcycle untIl a full brake lever or pedal
" obtained by pumping the brake !eve, or pedal unlll the pads
against the disc. The brakes will not function on the IIrst application
of the laver or pedal" this Is not done.
10-10 BRAKES
Disassembly
• Remove Ihe front/rear caliper.
• Remove the pads and spring (see Pad Removal).
• Remove Ihe caliper holder, shaft rubber friction boot and cover.
. Using compressed air, remove the piston(s) .
O Cover the caliper open ing w ith a clean, heavy cloth [A].
o Remove the piston(s) by lightlV applying compressed air [ B) to where
the brake tine fits into the caliper.
i .. WARNING
To Ivold .. ,Ious Injury, never place your lingers or palm Inside the
caliper opening. "you apply compr...ed air Into the caliper, the
ptston(.) may crush your hIInd Of" flnge,..
NOTE
O lf the c8/ipfll is to be disass8fTlblBd sher lemova! and compressed air
is not BVllilabltJ, remOlll1 the piston(s) using the following three steps
before disconnecting the brake hose from the caliper.
O Pfepare 8 container fOf brake fluid, and perform the work above it.
ORemove the pads lind spring (see Pad Removal).
OPump thll brllkillever or pedsl to rsmove the caliper piston(s) .
• Remove the dust seal(s) and fluid seal(s).
• Remove the bleed valve and rubber cap.
Assembly Notes
• Clean the caliper pans except for the pads.
For cleaning the parts, ute only disc brake Uuld, Isopropyl alcohol,
or ethylelCohol•
• Tighten the bleed valve.
Torque - Caliper Bleed Vatva: 7.8 N-m (0.8 kg-m, 69 In.lb)
.Replace the fluid seals which are removed with new on95.
O Apply brake fluid to the fluid seals [AJ , and install them into the
cylinders by hand.
• Replace the dust seals with new ones if they are damaged.
OApp!v brake fluid to the dust seals [ 8J, and install them into the
cylinders bv hand .
• Apply brake fluid to the outside of the pistons [C]. and push them into
each cylinder by hand.
BRAKES 10-11
e Replace the shaft rubber frlcuon boOI [A ] and dust cOlier [ 8 ] if they
are damaged.
e Applva thin coat of PSC (Poly Butyl Cuprysil) grease to the caliper
holder shafts [C] and holder holes ( PSC is a special high temperature,
waler· resistant grease) .
e lnstall the anti -rattle spring [A J in the caliper as shown .
• Install the pads (see Pads Installation Notes) .
• Wipe up any spilled brake flUid on the caliper with watered cloth.
10-12 BRAKES
Brake Pads
Removal
• Remove the disc/ caliper cover.
• Loosen the pad bolts.
• Unscrew the caliper mounting bolts.
• Detach the caliper from t he disc.
e Take the piston side pad [A] out of the caliper holder.
• Push the caliper holder [8] toward the piston, and then remove the
other pad [el from the caliper holder shafts.
Installation Notes
• Push the caliper pistons in bV hand as far as they w ill go.
e lnstall the anti- rattle spring in place.
e lnstall the piston side pad first. and then the other pad .
• Tighten the brake pad bolts.
Tor~
- Brake Pad Bolt 18 N~ (1 .8 k~ , 13 It.lb)
e lnstall the caliper (see Caliper Installation Notes) .
IlWARNING
Do not attempllo drlve1he motorcycle until. full brake lever Of pedal
II; obtained by pumping the brake lever or pedal until the pads .r.
_o.lnat the disc, The brake will not function on the first application
01 the lever or pedal II this Is nol done.
Inspection
. Chock the lining thickness and condition of the pads in each caliper.
If either pad is damaged. replace both pads in the caliper as a set.
*If the lining thickness (AJ of either pad is less than the service limit
(8 ], replace both pads in the caliper as a set.
*
lining Thlckne ••
Standard:
Service limit
Front
Rear
4.2mm
4.7mm
, mm
'mm
BRAKES 10-13
Master Cylinder
CAUTlON
Brakellukl quickly ruins painted or ptastlc surfaces; any spilled fluid
should be completely wiped up Immediately with • damp c loth.
Front Master Cylinder Removal
. Pull back the dust cover, and remove the banjo bolt [A] to disconnect
the upper brake hose from the master cylinder (see Brake Hose
Removal/ Installation Notes) .
• When removing the brake hose, temporarily secure the end of the brake
hose to some high place to keep fluid loss to a minimum.
• Unscrew the clamp bolts [BJ, and take off the master cylinder [CI as
an assembly with the reservoir and brake lever.
Front Master Cylinder Installation Notes
. The master cylinder clamp must be installed with the arrow marl< (A]
upward.
O Tighten the upper clamp bolt ( BJ first, and then the lower clamp bolt
[C). There will be a gap at the lower part of the clamp after tightening.
Torque - Master Cylinder Clamp Botta: B.8 N-m(0.9 kg-m, 78 In-Ib)
• Replace the washers that are on each side of the hose fitting with new
ones.
• Torque the brake hose banjo bolt.
Torque - Brake Hose Banjo Bolt 25 N-m (2.5 kg-m, '8.0 fI-lb)
.B leed the brake line (see Bleeding the Brake Line) .
• Check the brake for good braking power, no brake drag, and no fluid
leakage.
Rear Master Cylinder Removal
• Remove the reservoir guard and the reservoir mounting bolt [A) .
• Remove the cotter pin [ F).
• Pull off the joint pin [B).
NOTE
o Pu/l off the joint pin while pressing down the brake pedal.
• Unscrew the brake hose banjO bolt (CJ (see Brake Hose
Removal/ Installation Notes) .
• When removing the brake hose, temporarily secure the end of the brake
hose to some high place to keep fluid loss to a minimum .
• Unscrew the master cylinder mounting screws [D1. and remove the
master cylinder [ EI with the reservoir.
10-14 BRAKES
• Remove t he reservoir cap, and pour the brake fluid into a container.
• Remove the reservoir and its hose from the master cylinder.
Rear Master Cylinder Installation Notes
. Replace the coner pin with a new one.
• Replace the washers afe on each side of the hose fining with new
ones.
e Torque the following:
Torque - 8 ..... Hose 8anjo Bolt 25 N-m (2.5 kg-nl, '8.0 ft·lb)
. B~
the brake line (see Bleeding the Brake line) ,
. Check the brake for good braking power, no brake drag, and no fluid
leakage.
• Check the brake pedal position.
Front Master Cylinder Disassembly
• Remove the frOnt master cylinder.
• Remove the reservoir cap and diaphragm, and pour the brake fluid into
a container.
• Unscrew the locknut and pivot bolt, and remove the brake lever.
• Push the dust cover [AJ out of place, and remove the circlip [8].
Specla' Tool - Inside Clrcllp Pliers: 57001-143
• Remove the washer [C]. pull out the piston [0] . secondary cup [E],
primary cup [F]. and return spring [G).
CAIJOON
Do not remove the lecondary cup trom the piston since removal will
damage It
Rear Master Cylinder Disassembly
• Remow the rear master cylinder.
• Slide the dust cover [A] on the push rod [8] out of place. and remove
the circlip [C] .
Special Tool - Inside Clrcllp Pliers: 57001-143
• Pull out the push rod with the piston stop [OJ .
• Take off the piston [E]. secondary cup [F], primary cup [G). and
return spring [ H) .
Do not remove the l.condary cup trom the plslon Iince removal will
demage It
. Remove the circlip [I] , and take off the connector {J] and O-ring
(KJ.
BRAKES 10-15
Assembly Notes
. Sefore assembly, clean all parts including the master cylinder with
brake fluid or alcohol.
. Apply brake fluid to the removed pans and to the inner wall of the
cylinder.
.ll.CAI1T10N
Except for the disc pads and disc, use only dIsc brake fluid, Isopropyl
alcohol, or ethyl alcohol lor cleaning brake parts. Do not use any
other fluid for cleaning lhasa parts. Gasoline, engine 011, Of any other
petroleum distillate will cause deterlorallon of the rubber parts. 011
spilled on any part will be dlftlcuilio the wash off complelely. and will
eYentual1y deteriorate the rubber used In the disc brake.
e Take care not to scratch the pist on or the inner wall of the cylinder.
e Tighten the brake lever pivot bolt and the lockn ut securely.
Inspection (Visuallnspectionj
• Disassemble the front and rear master cylinders .
• Check that there are no scratches, rust or pitting on the inner wall of
each master cylinder [AJ and on the outside of each piston (8],
*11 a master cylinder or piston shows any damage, replace them .
• Inspect the primary [C] and secondary (DJ cups.
*If a cup is worn, damaged, softened (rotted). or swollen, the piston
assembly should be replace to renew the cups.
* If fluid leakage is noted at the brake lever, the piston assembly should
be replaced to renew the cup.
• Check the dust cover [El for damage.
* If they are damaged, replace them .
• Check that the relief [F] and supply [G) ports are not plugged.
* If the small relief port becomes plugged. the brake pads will drag on
the disc. Blow the ports clean with compressed air.
. Check the piston return springs [ H] for any damage.
A
* If a spring is damaged, replace it.
H
c
•
10-16 BRAKES
Brake Disc
Inspection
. Visually inspecllhe disc.
If It is scratched or damaged, replace the disc.
*
~
• Measure the thickness of each disc at the point where it has worn the
"""I.
al
ocr'!
.
~ ( i? - ~~
~
I,."" 1' ~
0 - '-'
"O ~
Measuring Are~
""
" "
* Replace the disc if it has worn past the service limit.
Thickness
Standard:
Service Limit
F"",'
Rear
2.85 - 3.15 mm
2.Smm
4 .35 - 4.65 mm
3.8mm
• Place a jack under the motorcycle so that the front/rear wheel is raised
off t he ground.
Special Tool - Jack: 57001-1238
_ Set up a d ial gauge against the disc as illustrated.
o For the front disc, tum the handlebar fully to one side.
• Measure the disc runou! while rotating th e wheel slowly.
If the runout exceeds the service limit. replace the disc.
*
Runout
Slandard:
Servlc. Limit
Not more than 0.12 mm
O.3mm
.~
. ~.
~:~
,
BRAKES 10-17
Brake Hose
Removal/Installation Notes
CAUTlON
Brake fluid quickly ruins painted or plastic surfaces; any spilled fluid
should be completely wiped up Immediately with a damp cloth.
• When removing the brake hose, take care not to spill the brake fluid
on the painted or plast ic parts .
• When removing the brake hose. temporarily secure the end of the brake
hose to some high place to keep fluid loss to a minimum.
e There afe washers on each side of the brake hose fitling. Replace them
with new ones when installing .
• When installing the hoses, avoid sharp bending. kinking, flattening or
twisting, and route the hoses according to the Cable, Harness, Hose
Routing section in the General Information chapter.
• Torque the banjo bolts altha hose fittings.
Torque - Brake Hose Banjo Boltl: 25 N-m (2.5 kg-m, 18.0 ft-Ib)
.B leed the brake line aher installing the brake hose (see Bteeding the
Brake Line).
Inspection
.The high pressure inside the brake tine can cause fluid to teak or the
hose to burst if the fine is not properly maintained. Bend and twist the
rubber hose white examining it.
Replace it if any cracks or bulges are noticed.
*
SUSPENSION 11 -1
Suspension
Table of Contents
Exploded View ...................................
.............. , ' · 2
Specifications ............... ..................
.............. 11 ·4
Front For4< ............................................................... 11 · 5
Air Pressure ........... ....................... ................ 11 · 5
Rebound Damping Adjustment ....... ............. l1 · 5
Compression Damping Adjustment ......... ..... 11 · 5
Oil Level Adjustment ....... ........................ ...... 11 · 6
Reo1oval ......................... ................................ 11 · 8
Installation Notes ...... ... .................................. 1 1 -8
DisassemblV (Oil Change) ............................ 11 -9
Spring Guide Removal ..............................1 1 -9
Push Rod Disassembly ........................... 11 - 1 0
Inner Tube RemovaL ..............................l l - 11
Assembly (Oil Change) Notes .................... 11 -12
Inner to Outer Tube Assembly ................ 11 - 12
Inner Cylinder Assembly ......................... 11 - 12
Install Inner Cylinder ............................... 11 - 13
Innm Tube Inspection .................................11 - 15
Guide Bush Inspection ..............................11 - 15
Dust Seal Inspection .................................11 - 15
Spring Tension ........... ................................ '1 - 15
Rear Suspension (Uni-Trak) ......... ............. ... ... .. .11 - 16
Rear Shock Absorber: ................................. ..... 11 - 16
Rebound Damping Adjustment ...... ........... 11 - 16
Compression Damping Adjustment ............ l 1 - 16
Spring Preload Adjustment ......................... 1 1 - 17
Removal .......................................................l ' - '7
Installation Notes ............................. ........... 11 - 18
Spring Replacement ...................................., 1 -18
Disassembly (Oil Change) .......................... 11 -19
Assembly Notes ...........................................11 -20
Spring Tension ............................................ 11 - 23
Scrapping ..................................................... 11 - 23
Swing A.rrn: ....................................................... 11 -24
Removal ....................................................... 11·24
Installation Notes .........................................l1 · 24
Tie- Rod, Rocker Arm: ...................................... 11 - 24
Tie- Rod Removal ....................................... 11 - 24
Tie- Rod Installation Note ............ ......... ...... 11 - 25
Rocker Arm Removal ................... ........ ....... 11 - 25
Rocker Arm Installation Notes ...... ......... .... 11 - 25
Uni-Trak Mainten ance ..........................................11 - 26
Rocker Arm Sleeve Wear ............................. 11 -26
Rocker Arm Mounting 80lt Bend ............... 11 -26
~
11
11-2 SUSPENSION
Exploded View
Front Fork
T' ·
~
~
30
o
o
~
,.
,.•• Spring Seal
1. Screw
C·Rlng
3. Top Plug
Spring
N",
••
7. CoUar
8. Spring Guide
9. Guide Stay Nul
10. Oil Lock Pis ton
11 .
12.
13.
14.
Split Ring Keeper
Piston Holder
Push Rod
Foril Cylinder
15. Ouler Tube
16. Guide Bush
17. Washer
18. all Seal
19. Retaining Ring
20. Oust Seal
21. Guide Bush
22. Inner Tube
23. Gaske'
24. Fork Cylinder Valve Assembly
25. Cap
26. Fork Guide
27. Fork Protector
28. Front Axle Clamp
29.
30.
31.
32.
33.
34.
Left Fork Tube
Right Fork Tube
Steering Stem Nul
Washer
Sleering Stem Head Bracket
Steering Stem
l
: Apply a non-permanenllocklng
11
T2
T3
14
T5
T6
T7
T8
:
:
:
:
:
:
:
:
agent to the thread • .
22 N-m (2.25 kg·m , 16.3 tt-Ib)
20 N·m (2.0 kg-m, 14.5 ft· lb)
29 N· m (3.0 kg-m , 22 ft· lb)
15 N·m (1 .5 kg-m, 11 f1·lb)
54 N· m (5.5 kg-m , 40 ft · lb)
9.3 N-m (0.95 kg-m , 82 in·lb)
27 N-m (2.8 kg.m, 20 tt·ib)
78 N·m (8.0 kg·m, 58 tt. ib)
SUSPENSION 11-3
Rear Suspension
5
6
L------I
JlI" ,[email protected]
. T2
[email protected]
@[email protected]
[email protected]
[email protected]
~
~
[email protected]
[email protected]
@[email protected]
21
1. Pivot Shaft
2. Swing Arm
3. Re.r Shock Absorber Bracht
4. Rocker Arm
5. Tlft.Rod
6. Re.r ~ Absorber Cylinder
7. Air Bleeder Bott
8. O·RlnQ
9. Bladder
10. Cap
11 . Circllp
12. Valve Cap
13. Locknut
19. O-Ring
20. 011 Seal
21 . Stopper
17. Rod Assembly
22. Rear Shock Absorber
M : Apply plenty of molybdenum
dlsulHde grease to the kl1de
T1 : 98 N-m (10 kg-rn, 72 ft-Ml;)
1'2 : 39 N-m (4.0 kg-m, 29 ft-Ib)
18. Pilton
T3 : 81 N-m (8.3 kg-m, 60 tt-Ib)
14. Adjusting Nul
15. Spring
16. Spring Guide
11 · 4 SUSPENSION
Specifications
Item
Front Fork :
Air pressure
Rebound damping adjustment
Compression damping adjustment
Oil viscosity
Oil capacity
Oil level (fully compressed,
spring removed)
Fork spring free length
Rear Suspension (Uni-Trak):
Rear Shock Absorber:
Rebound damping adjustment
Standard
Atmospheric pressure
Service Limit
---
Refer to 11-5
(Adjustable Range)
16 clicks
Refer to 11-5
(Adjustable Range)
, 6 clicks
KAYABA 01 or SAE 5W
525 ± 4 mL
115 ± 2 mm (from top of outer tube)
-----
(Adjustable Range)
l 00-150mm
514 mm
504mm
Refer to 11-17
(Adjustable Range)
16 clicks
Spring preload adjustment
(Adjusting nut position from the
center of the upper mounting hole)
131.5 mm
KX125:
136.
Smm IE) 134.5 mm
KX250:
275 mm
Rear shock spring tree length
Gas Reservoir :
Compression damping adjustment
Refer to 1' -17
Gas pressure
Tie· Rod , Rocker Arm :
Sleeve outside diameter:
long
Short
Rocker Arm Mounting Bolt Runout
1000 kPa (10 kg / cm 1 , 142 psi)
21 .987 _ 22.000 mm
, 5.989 - 16.000 mm
under 0. 1 mm
(E) : EUropean M odel
Spec .. 1Too. - Hoo6c Wrench: 57001 -1101
Jack: 51001 -1238
Forti: Spring H~r: 57001 -1286
Fort Cylinder Hokter: 57001 -1287
Forti: 011 Sea' Driver: 57oo1 -1J40
Fort.: Piston Rod Puner, M12 x 1.25: 57001 -1289
Fork 011 Level Gauge: 57001-1290
(Adjustable Range)
118 - 141 mm
118_143mm
270mm
(Adjustable Range)
16 clicks
--21 .85 mm
15.85 mm
0 .2mm
SUSPENSION 11 - 5
Front Fork
Air Pressure
T he standard air pressure in the fork legs is atmospheric pressure. The
air pressure in the fork legs increases as the fork heats up, so the fork
action will get stiffer as the vehicle operat ion progresses.
• Place the jack under the frame so that the front w heel is off the ground.
Special Tool - Jack: 57001·1238
• Remove t he screws [A] at the top 01 the fron t fork top bolts to let the
air pressure equalize. Then install them.
Rebound Damping Adjustment
• Place the jack under the fram e so that the front wheel is olf the ground.
Special Tool - Jack: 57001 -1238
. To adjust rebound damping. tum the adjuster [A] on the fron t fork top
plugs with the blade of a screwdriver until you feel a click. Adjust the
rebound damping to suit your preference under special condit ions.
CAIJT10N
The left and right fOf'k legs must have the same shod( damping.
Rebound Damping Adjuster Setting
Standard:
KX125: 11 clicks
KX2.50: 9 clicks
Seated position with adjuster turned fully clockwise (A].
"
",,
!~
I
[email protected]
$oller
Harder
(Counlertlockw,se) IClockw.se)
Number of turns coun terclockwise
usable range·16 clicks
Compression Damping Adjustment
• Place the jack under the frame so that the front wheel is off the g round .
Special Toot - Jack: 57001-1238
• Clean the bottom of the fork tubes.
• Remove the caps on the bottom of the fork tubes .
• To adjust compression damping, tum the adjuster [A] on the front fork
cylinder valve with the blade of a screwdriver unt il you feel a click.
Adjust the compression damping to suit your preference under special
condit ions.
CAIJT10N
The left and rlghllol1l legs must have the same shock damping.
Compre.. 1on Damping Adjuster Setting
Standard:
KXI25 : 12 clletts, (E) 14 clicks
KX2.5O: 9 clicks, (E) 11 clicks
( E) : European Model
Seated position wit h adjuster turned fully clockwise (A] .
. Put the caps into the boltom of the fork tubes.
"
"
I'
'" • •
,
0
[email protected]
Soher
Harder
ICOUnlerClockw,se) IClock wlst)
Number of turns counterclockwise
usable range·16 clicks
11- 6 SUSPENSION
Oil Level Adjustment
e Place the handlebar on one side, and loosen the fork top plug .
• Remove the front feric...
• t10ld the outer tube in a vise.
• ~screw the top plug out of the outer tube.
• SlowlV compress the front fork fully w hile pulling down the outer tube
(touch the stepped portion of the inner tube to the outer tube dust
cover lower end) , and place a stand or other suitable support under the
inner tube lower end .
• Pull down the fork spring [AJ and insert the fork spring holder [B]
under the push rod nut [C].
Spec .. 1Tool - Forte Spring Holder. 57001-1286 {B]
. Use wrenches on the rod nut and the top plug [AI 10 loosen the push
rod nut
• Remove the top plug from the push rod.
• Remove the forlt spring holder.
• lift the fork spring [ 8] and its top spring seat [C} OUI of the inner lube.
• Take the rebound damping adjuster rod (short) [ A] out of the push
rod {B] .
• Hold the font tube upside down over a clean container and pump it to
drain the oil. Remove the rebound damping adjuster rod (long) [8]
from the push rod [AJ.
NOTE
o To discharge the fork oil. pump the push rod up and down ten times.
SUSPENSION 11 -7
• Hold the fork tube upright, press the outer tube and the push rod all
the way down .
• Insert both the long and shon rebound damping adjuster rods into the
push rod.
NOTE
o The spring should not be installed.
• Fill the front fork to the lOp with the specified oil.
Recommended 011
KAYABAOlorSEASW
Front Fork all Capacity
525 ± 4mL
NOTE
o While doing this, lake care to keep the oil level ropped off so that it
stays above the two Isrge holes [A] near the top of the innsl tube
[8J .
• Purge the air from the fork cylinder by gently moving the piston rod
pu ller [A] up and down five times.
Special Tool - Forti rl, ton Rod Pulle, _M12 x 1.25: 57001 ·1289 [Al
III
. Purge the air from between the inner and outer tubes by pumping the
outer lube [A] up and down.
D
. After purging the air from the assembly, let it sit for about five minutes
so that any suspended air bubbles can surface.
• Check the oil level.
OWith the fork fully compressed, put the oil level gauge [A] and the
stopper ( 8), and inspect the d istance from the top of the outer tube
to the oil.
Special Tool - Fork 0 11 La...el Gauge: 57001 ·1290 [A]
011 Level (fully compressed, wlthocJt spring)
Standard:
11 5 ± 2mm
Adjustable Range:
100 - 150 mm
A
B
'11I_~
11 -8 SUSPENSION
*11 no oil is drawn out. there is insufficient oil in the fork tube. Pour in
enough oil, then draw out the excess oil.
.Install the partS removed (see Front Fork AssemblV in this chapter) .
Removal
. Remove the front disc cover.
• Remove the fork protectors [A] .
• Remove the front brake hose clamps [8l
. Remove the caliper from the fork leg to be removed, and fest the caliper
on some kind of stand so that it doesn't dangle.
• Remove the front wheel (see Front Wheel Removal in the
Wheels/Tires chapter) .
• l oosen the upper and lower fork clamp bolts [AJ.
. With a twisting motion, work the foric leg down and out
.,f
Installation Notes
the fori< leg was disassembled, chock the fork oil level.
• Route the cables and hose according to the Cable, Harness, Hose
Routing section in the General Information chapter.
• 'nstall the front wheel (see Front Wheel Installation Notes in the
Wheels/Tires chapter) .
• Torque the followi ng:
Torque - Foft CI.mp Botts:
Upper. 20 N-m (2.0 kg-m, 14.5 ft-Ib)
Lower. 22 N-m (2.25 kg-m, 18.3 ft-lb)
Foft Protector Mounting Bolts: 10 H-m (1 .0 kg-m, 871n-lb)
Front C.llper Mounting Botti: 25 N-m (2.5 kg-m, 18 ft -Ibl
. Check the front brake operation ahar installation.
SUSPENSION 11 -9
Disassembly (Oil Change)
Spring Guide Removal
•
•
•
•
•
Place the handlebar on one side, and loosen each fork top plug.
Remove the front fork.
Hold the outer tube in a vise.
Unscrew the top plug out of the outer tube.
Slowly compress the front fork lully while push ing up the inner tube
lower end (touch the slepped portion of the inner tube to the outer
tube dust cover lower end). and place a stand or other suitable support
under the inner tube lower end .
. Pull down the fork spring [A) and insert the fork spring holder (8]
under the push rod nul [e].
Specia l Tool - Forti Spring Holder: 57001 ·1286 [8 ]
. Use wrenches on the rod nut and top plug [A] loosen the push rod
nut.
. Remove the top plug from the push rod .
• Uft the font spring ( 8 ) and its top spring seat [ el out of the Inner tube.
• Take the rebound damping adjuster rod (short) [A] o ut of the push
rod [ BJ .
• Hold the fork tube upside down over a clean container and pump it to
drain the oil. Remove the rebound damping adjuster rod (long) [B)
from the push rod [ A).
NOTE
o To discharge the fork oil. pump the push rod up and down ten times.
,..
11 -10 SUSPENSION
. Remove the push rod nut (A], and take out the collar [ 8] and spring
guide Ie].
Push Rod Disassembly
. Clean the bottom of the inner tube.
• Remove the cap on the bottom of the inner tube.
• Hold the front fork horizontalty in a vise.
e Stop the cylinder unit [A] from turning by using the fork cylinder
holder [8] . Unscrew the cylinder valve assembly (C] , and take the
cylinder valve assembly and gasket out of the bottom of the inner tube.
Special Tool - Fort Cylinder HoJder: 57001 ·1287 [8 ]
A Inner Tube
B. Cylinder Valve Assembly
C. O-ring
D. Gasket
. Pull the push rod [A] and cylinder unit [8] out the top of the oUler
tube [C] .
• Unscrew the guide stay nut [8] from the piston holder [E], and
remove the split ring keepers [C] ,
. Remove the O-ring (A] , guide stay nut [ B] , oil lock piston ( 0) and
piston holder (E] from the push rod.
8
A
c
SUSPENSION 11 -11
. Pull the push rod assembly [A] out the bonom of the inner cylinder
[BJ .
A
•
•
Inner Tube Removal
• Separate the inner tube
[el
from the outer tube [OJ as follows:
OSlide up the spring band [A).
OSlide up t he dust seal [8J.
o Aemove t he retaining ring [A] from the outer tube.
O Grasp the outer tube [8] and stroke the inner lube [A) up and down
several times. The shock to folit seal separates t he inner lube from t he
outer tube.
. Remove the guide bushes [A], washer (B], oil seal
and dust seal from the inner tube.
[el. retaining rin g,
11 -12 SUSPENSION
Assembly (Oil Change) Notes
Inner to Outer Tube Assembly
• Replace the following with new ones:
Dust Seal [AJ
Retain ing Ring [ BJ
Oil Seal [C]
Guide Bushes [ 0]
. Place an oil cooted plastic bag (E] over the end of the innOf tube to
protect the oil seals.
OThe inner tube guide bush groove has a sharp edge [ F] that can out
the sealing lip of the seals as they are pushed down over the inner tube.
e lnstall in order these parts on the inner tube .
• When assembling the new ouler tube guide bush [AJ , hold the washer
[ 8] against the new one, and tap the washer with the fori< oil seal
driver [C] until it stops.
Special Toot - Forte 0 11 Seal Dr iver, CIl43: 57001 ·1340 [C]
. After installing the washer, inSlaUthe oil seal by using the fork oil seal
driv8f.
Special Tool - Fort 0 11 Seal Driver, 4>43: 57001 ·1340
• Install the retaining ring to the outer tube.
• Push the dust seal into the outer tube. and put the spring band on the
dust seal.
•
Innet" Cylinder Assembly
. Install the oil lock piston {D] on the piston holder [ EJ so that the
grooves face down.
o First. insert the push rod [AJ into the cartridge. then, install the
anti-bottoming piston. The split ring keepers [C] that hold the
anti-bottoming piston to the push rod can cause severe damage to the
fork if not installed securely.
A. Push Rod
B. Guide Stay Nut
C. Split Ring KeepefS
D. Oil Lock Piston
E. Piston Holder
F. Upward pressure on piston holder positions keepers while guide
stay nut is tightened.
A
•
o
c
SUSPENSION "-'3
. Tighten the gUide slay nut [D) .
TOf'que - Gukle Stay Nut 27 N·m (2.8 kg-m, 20 ft· lbl
. Check the D-ring [Elan the guide stay nut, and replace it with a new
one if damaged.
A. Piston Holder
B. Oil lock Piston
C. Grooved Side
D. Guide Stay Nut
E. O-ring
Install Inner Cylinder
. Check the O- ring [A] on the cylinder valve assembly [ B] , and replace
it with a new one .
• Replace the gasket [C] with a new one.
• Apply a non -permanent locking agent to the threads [OJ of the
cylinder valve assembly and screw the valve assembly into the bonom
of the inner lube .
• Hold the inner cylinder with the fork cylinder holder, and tighten the
@
cylinder valve assembly.
Special Tool - Fort Cylinder Holder: 57001-1287
Torque - Cylinder Valve As ••mbty: 54 N-m (5.5 kg -m, 40 tt-tb)
• Install the spring guide (A] so thai the longer end (8] is down. Then
install the collar [CJ with the large end [0] down
B {
. Screw on the push rod nut [ B] so that the chamfered side [0] is
down.
o Position the push rod nut at 18.5 mm [AJ or more from the top of t he
push rod.
A. 18.5 mm
B. Push Rod Nut
C. Collar
O. Chamfered Side
E. Spring Guide
11 -1 4 SUSPENSION
• Insert the long rebound damping adjuster rod into the push rod.
elnsef't the short rebound damping adjuster rod [Al into the push rod
so that the holes [ Bj are down.
e Pour in the type and amount of fork oil specified and adjust the oil level
(see Oil Level Adjustment in this chaptet) .
• Screw the fork piston rod puller [AJ onto the end of the push rod
[81.
5J*:1I1 Tool - FOft Piston Rod Pul"r, M12 x 1.25: 57001 ·1289 [AJ
• Pull the push rod up with the special tool for the next procedures.
O Pull up the push rod slowly so as not to spill the fork oil out of the fork
tube.
• Install Ihe fork spring into the inner tube and then set the spring seat
in place.
• Pull the fork spring down while pulling up on the fork piston rod pullet
[AJ and insert the fork spring holder [8] under the push rod nut [C],
Special Tool - FOftl Spring Holder: 57001 -1286 (8 ]
. Remove the fork piston rod puller.
• Check the D -ring on the top plug and replace it with a new one if
damaged .
• Unscrew the rebound damping adjuster fully, then screw the front fork
top plug onto the push rod .
• Holding the top plug [Al with a wrench, tighten the push rod nut
{a] against the top plug.
Torque - Puth Rod Nut 15 N-m (1.5 kg-m, 11 ft-Ib)
. Pull oullhe fork spring holder, raise the outer tube and screw the top
plug into il.
. Aher installing the front fork, torque the top plug.
Torque - Fork Top Plug: Z9 N-m (3.0 kg-m, 22 ft-Ib)
SUSPENSION 11 -15
Inner Tube Inspection
. Visually inspect the inner tube, repair any damage.
• Nick or rust damage can sometimes be repaired by using a wet· stone
to remove sharp edges or raised areas which cause seal damage.
*11 the damage is not repairable, replace the inner tube. Since damage
10 the inner tube damages the oil seal, replace the oil seal whenever the
inner tube is repaired or replaced .
• Temporarily assemble the inner and outer tubes, and pump them back
and forth manually to check for smooth operation .
CAlJT10N
" the Inner tube Is badly bent or creased, replace H. Exc... lve
bending, followed by subsequent straightening, can we.ken the Inner
tube.
Guide Bush Inspection
. Visually inspect the guide bushes [A]. and replace them if necessary.
Dust Sea/Inspection
• Inspect the dust seal [A] for any signs of deterioration or damage.
* Replace it if necessary.
• Replace the oil seal (B) with a new one whenever it has been
removed.
Spring Tension
. Since a spring becomes shorter as it weakens, check its free length to
determine its condition.
* If the spring of either fork. teg is shorter than the service limit, it must
be replaced. If the length of a replacement spring and that of the
remaining spring vary greatly, the remaining spring should also be
replaced in order to keep the forX legs balanced lor motorcycle stability.
Forte Spring Free Length
Standard:
514 mm
Sel"Ylce Limit:
504 mm
11 -16 SUSPENSION
Rear Suspension (Uni -Trak)
Rear Shock Absorber:
The rear suspension system of this motorcycle is Uni -trak. It consists
of a rear shock absorber, swing arm, tie -rod and rocker arm.
To suit to various riding conditions, t he spring preload of the shock
absorber can be adjusted or the spring can be replaced with an optional
one. Also the damping force can be adjusted easily so changing oil
viscosity is unnecessary.
Rebound Damping Adjustment
. Turn the rebound damping adjuster [A] on the fear shock absorber
lower end with the blade of a screwdriver until you feel a click.
* 11 the damper setting feels too soft or too stiff, adjust it in accordance
with the following table:
Rebound Damping Adl....'.' Setting
Standa rd:
KX125,250.: 12 cUcb
Seated position with adjuster turned fuliV clockwise [A] ,
"
•
'"
"
16
0
--®
Solter
Hlrder
!Counlerctockwise j (Clockwise)
Number of turns counterclockwise
usable range· 16 dicks
Compression Damping Adjustment
. Tum the compression damping adjustElf fA] on the gt'tS reservoir with
the blade of 8 screwdriver until you feel 8 click.
*11 the damper setting feels too soh or too stiff, adjust it in accordance
with the following table.
Compreulon Dempktg Adjuster Senlng
Standard:
KX1 25.250: 13 c llcktl, (El 15 clldts
Seated position with adjuster turned fully clockwise [A] .
10
I
•
"
"
15
0
--®
Softer
Hilder
!Counttrclockw;se) IClockwise)
Number of turns counterclockwise
usable range- 16 clicks
SUSPENSION 11-17
Spring Preload Adjustment
• Remove:
Side Covers
Seat
Silencer
Rear Frame [AJ with Air Cleaner Housing [ 8 ]
• Using Ihe lack under the frame, raise t he rear wheel off the ground.
Special Tool - Jack: 57001·1238
. Using the hook wrenches [AJ. loosen the locknut [ B] and turn the
adjusting nut [C] as required. Turning the adjusting nut down makes
the spring preload stronger.
Special Tool - Hook Wrench: 57001·1101
Spring Preklad Adjustm ent
(Adjusting nut position (AJ from the center at the mounting hole)
Standard:
Adjltltable Range:
KXI2S: 134.5 mm
KX250: 135 mm
KX125: 118 _ 141 mm
KX250: 118 - 143 mm
. Tighten the locknut securely.
• After adjusting, move the spring up and down to make sure that the
spring is seated .
• Inslailiha pans removed .
• Torque the rear frame mounting bolts.
Torque - Rear Frame Mounting Bolts: 26 N-m (2.7 kg-m, 19.5 tt-Ib)
Removal
• Remove:
Side Covers
Seat
Silencer
Rear Frame with Air Cleaner Housing
. Using the jack under the frame, raise the rear wheel off t he ground.
Special Toot - Jacll;: 57001·1238
• Remove the tie-rod front mounting bolt [AJ.
CAIIT10N
When ptlillng out the mounUng botta, 11ft the rear wheel Illghtly.
Forcing or tapping on a boN could damage the bolt, I leeve, and
bearing .
• Remove the rear shock absorber lower mounting bolt [ 8 ].
11 -18 SUSPENSION
e Remove the rear shock absorber upper mounting bolt [AJ, and pull the
rear shock absorber ( 8 ] down and out.
Installation Notes
e Torque the following:
Torque - Reer Shock Absof'ber Mounllng Bolts: 39 N-m (4.0 kg-m, 29
ft-Ib)
TIe-Rod Mounting Nut 81 N-m (8.3 kg-m, 80 tt-Ib)
Re.r Frame Mounting Botti: 26 N-m (2.7 kg-m, 19.5 ft-Ib)
S pring Replacement
In addition to the standard spring, heavy and light springs are
available. If the standard spring is improper for your purpose, select a
proper one accord ing to the rider's weight or course conditions.
• Remove:
Sea.
Side Covers
Silencer
Rear Frame with Air Cleaner Housing
. Remove the rear shock absorber.
• Clean the threaded portion on the upper of the rear shock absorber.
• Hold the lower of the rear shock absorber wit h a vise.
• Using the hook wrenches [e), loosen the locknut [8] and l urn the
adjusting nut [AJ all the way up.
Special Tool - Hook Wrench: 57001-1101
Remove the rear shock absorber from Ihe vise.
• Slide down t he rubber bumper.
• Remove the spring guide (A) from the shock absorber and lih off Ihe
spring [B].
SUSPENSION 11 -19
• Exchange the spring for an optional part .
• Install the spring so that smaller diameter end [A] fa ces upward
• Install the spring guide .
• Adjust the spring preload (see Spring Preload AdJuslmenl) .
• Install the fear shock absorber.
e lnstall the parts removed.
Disassembly (Oil Change)
The oil should be changed in the feaf shock absorber alleast once per
raci ng season. The frequency for best pariormance must be based upon
riding condit ions and rider ability.
• Remove the rear shock absorber from the frame (see Rear Shock
Absorber Removal) .
• Remove the shock absorber spring (see Rear Shock Absorber Spring
Replacement) .
e Point the valve [A) away from you. Slowly release nitrogen gas
pressure by pushing down the valve core with a screwdriver.
ilt.WARNING
Be .ure 10 point the reservoir valve away from you when releasing
nitTogen gas pressure. An 011 mist fI otten released with the nitrogen.
Always releale nitrogen gas pressure before explosive separation
at parts .
• Adjust the gas reservoir damping adjuster to the softest pOSition .
• Remove the air bleeder bolt [A] and pump the rear shock to drain the
oil out of the rear shock body .
• Install the air bleeder bolt.
• Using a suitable tool [A] and press [B]. push the reservoir cap in 10
mm.
" -20 SUSPENSIO N
• Remove the circlip (A) 'rom the gas reservoir .
• Pull the gas reservoir cap [8] out of the gas reservoir using pliOfS [AJ .
e pry or tap [8] at the gaps [AJ in the stop with suitable tools to 'ree the
stop from the rear shock body.
• Slide the stop up to the top of the push rod then lightly tap around the
seal with 8 suitable rod and mallet and push the seal assembly 10 mm
down.
e Remove the circlip (AJ ,
e lightly move the push rod back and fanh, and pull out the push rod
assembly.
• Pour the oil out of the rear shock body.
Assembly Notes
e Adjust the gas reservoir damper adjuster to the softest position .
• Install the air bleeder bolt.
o Check the O -ring on the air bleeder bolt,. and replace it if necessary .
• Pour KYB K2-C (SAE 5W or Bel -Ray SE2 #40) oil into the gas
reservoir to 60 - 70 mm (A] from the gas reselVOir upper 6fld.
SUSPENSION 11 - 21
. Check thaI the bladder f A] on the gas reservoir cap is not partiallv
collapsed.
*If it 1$, push down the valve core with a screwdriver.
. Check the bladder for signs of damage or cracks.
* If necessary, replace it with a new one.
CAIJ110N
Do not use 8 damaged or partially collapsed bladder, because It may
bu,.... greatly reducing rear shodl: performance .
• Apply grease to the lip [ 8] of the bladder.
• Push the bladder Into the gas reservo ir slowly until it Just clears the
circllp groove. Wipe out any spilled oit.
CAUTlON
En~ure
that no air remainaln the system.
• Check the circlip for weakening. deformity and flaws.
* 11 necessary. replace it with a new one.
j,WARNING
" weakened, delormed or flawed clrcllp Is used, the g.. , ... rvolr
cap may nol hokt when Inlectlng the nitrogen gas. This would allow
all and Inlernal parts to .. plod. out of the reservoir .
• Mounl th e circlip [A] In the groove in the gas reservoir .
• Pull up the gas reservoir cap [A ] against the circlip. The end of the
gas reservoir cap must align {C] with the end of the gas reservoi r [ B] .
J.. WARNING
" the end of the gas rKe",olr cap and the end of the gas , ..e",oIr
are not aligned, the clrcllp .. not conectty fitting In the groove In the
gas , ..e",ol, or .. deformed. In this case, the 011 and Internal parts
could explode out of the re.ervolr when InJecting the nHrogen gas or
while riding the motorcycle.
l®
11-22 SUSPENSION
. Pour KYB K2-C (SAE 5W or Bel-Ray SE2 #40) oil into the rear shock
body to 45 mm [Al from the lower 6fld of the rear shock body.
• Insert the piston [AJ end 01 the push rod assembly into the rear shock
body slowly, and pump the push rod until all the air is forced out of the
feaf shock body.
• Push the seal assembly [ 8] Into the rear shock body until it Just clears
the circlip groove.
• Check the circlip.
'* If it
IS deformed or damaged. replace It with a new one.
e Fit the circllp [AJ into the groove in the rear shock body.
J'.. WARNING
It the clrclip Is not a co,.,.1n lit In the groove In the rea, shod!. body,
the push rod asumbly may come out 01 the shock absorber when
Injecting the nitrogen gas or riding the motot'cycle .
• Pull up the push rod assembly [8] against the circlip.
• Force the stop [C] into the rear shock body by lightly tapping around
the edge of the stop with a mallet.
• Hold the lower end of the push rod assembly with a vise.
• Pump the rear shock up and down several times, and then leave it in
the fully extended position for about three minutes.
• Remove the air bleeder bolt [A] from the upper part of the rear shock
bod,.
*
If oil comes out of the air bleeder bolt hole, let it overflow until it stops.
* If oil does not come out of the air bleeder bolt hole, add the specified
oil into the air bleeder bolt hole until it overflow (that is. until all the
remaining air is forced out) .
• Install the air bleeder bolt securely.
• Fully extend th e push rod assembly.
A
SUSPENSION 11-23
• Inject nitrogen gas to a pressure of 50 kP a (0.5 kg / em', 7 psi) through
t he valve on the gas reservoir .
• Check the rear shock body and gas reservoir for oil and gas leaks.
* If t here are no leaks, inj ect the mlrogen gas up 10 the 1 000 kPa (10
kg / cm 1, 142 psi) pressure.
~·... WARNING
Pressurize the gas reservoir with nitrogen gal only. Do nol use air
or other g...., since they may cause premature wear, rust, fire
hazard Of substandard performance.
High pr.ssur. gas Is dangerous. Have a qualified mechanic perlOnT'!
this procedure.
•
•
•
•
Install the spring and spring gu ide .
Adjust spring preload .
Reinstall the rear shock absorbef.
Install the parts removed .
Spring Tension
Since a spring becomes shorter as it weakens. check its free length 10
determine its condition.
*If the spring is shoner than the service limit, it must be replaced.
Rear Shodt Abaorber Spring Fre. Length
Standard:
275 mm
Service Limit
270 mm
Scrapping
,t·.. WARNING
Since the rear shock absorber contains nitrogen gas, do not
Incinerate the rear shock absorber.
8elor. a rear shock absorber Is scrapped, releace the nitrogen gas
completely. Do not point the vatve (A] toward your lace or body.
11-24 SUSPENSION
Swing Arm:
Removal
. Remove the rear wheel (see Rear Wheel Removal in the Wheels/Tires
chapter) .
• Remove the brake pedal.
• Remove the tie-rod rear mounting bolt [AJ .
CAUTION
When pulling oollhfl mounting bolts, 11ft the rear end altha.wlng ann
sl'ohtty. Forcing Of' tapping on II boH could damage the bolt, sleeve,
and bearing.
• Pull out the swing arm pivot shaft [ 8], and remove the swing arm
[C].
e Separate t he chain guide and chain siippOf 'rom the swing arm,
Installation Notes
. Apply plenty of molybdenum d isulfide grease to the inside of the
needle bearings and sleeves.
• Torque the following:
TorQUe - SwIng Arm Pivot Shaft Nut 98 N-m (10.0 kg-m, 72 " _Ib)
TIe-Rod Mounllng Nut 81 N-m (8.3 kg-m, 60 ft.lb)
• Refer to the Wheels/Tires. Final Drive, and Brakes chapters for wheel
installation
Tie-Rod, Rocker Arm :
Tie-Rod Removal
• Using the jack under !he frame, raise the rear wheel off the ground.
Special Tool - Jack: 57001-1238
• Remove the tie-rod fronl mounting bott [A].
CAUTION
When pulling out the mounllng bolts, 11ft the rear wh_1 Illghtly.
Forcing Of tapping on a boH could damage the bolt, al_ve, and
bearing .
• Remove the tie-rod rear mounting bolt { B] , and therl lake out the
tie-rods {C].
SUSPENSION 11-25
Tie-Rod Installation Note
. Apply plenty of molybdenum disulfide grease 10 the inside of the
needle bearings and oit seals.
• Torque the lie- rod front and rear mounting nuts.
Torque - T....Rod MounUng Nuts: 81 N-m (8.3 kg-m, 60 ft-Ib)
Rocker Arm Removal
. Using the Jack under the frame, raise the rear wheel off the ground.
Special Tool - Jack: 57001 -1238
• l oosen the swing arm pivot shah nut.
• Remove the rear shock absorber bracket mounting bol ts ( E) .
• Remove the tie -rod fron t mounting bolt [A).
CAlJT10N
When pulling out the mounting bolts, 11ft the reaf wneel Sllghtty.
Forcing or tapping on a bolt could damage the bolt, sleeve, and
bearing .
• Remove the rear shock absorber lower mounting bolt [ B] .
• Remove the rocker arm pivot shah [C) .
• Remove the rock.a f arm [OJ .
Rocker Arm Installation Notes
. Apply plenty 01 molybdenum disulfide grease to the inside of the
rocker arm hole, outside of the sleeve, and needle bearing .
• Torque the following:
Torque - Roc:tter Arm Pivot Nut 81 N-m (8.3 kg-m, 60 tt-Ib)
Rear Shock Absorber Mounllng Boll: 39 N..m (4.0 kg-m, 29
tt-Ib)
Tie-Rod Mounting Nut: 81 N m (8.3 kg-m, 60 fI-lb).
Rear Shock Absorber Brackel Mounting Botti: 81 N-m (8.3
kg-m, 60 fI-lb)
Swing Ann Pivot Shaft Nut 98 N-m (10.0 kg-m, 72 fI-lb)
11 -26 SUSPENSION
Uni-Trak Maintenance
Check the uni-trak componeol parts for wear periodically. or
whenever excessive play is suspected .
• Using the jack under the frame, raise the rear wheel off the ground.
Special Tool - Jack: 57001·1238
. Push and pull on the swing arm (AI . up and down, to check for wear.
* A small amount of play on the swing arm is normal and no corrective
action is needed. However. if excessive play is felt. remove the uni-trak
parts from the frame and check for wear.
Rocker Arm Sleeve Wear
.Pull out the sleeves [A] of the rocker arm, and measure the outside
diameter 01 the sleeve.
*If the sleeve is wom past the service limit, replace the sleeve.
[
Standllrd:
s.rv~ Umtt
21.987 - 22.000 mm
21 .85 mm
]
Standard:
Servbt Umft:
15.189 - 18.000 mm
15.85 mm
......
Rocker Arm Mounting Bolt Bend
A berlt bolt causes vibration. poor handling. and instability.
e To measure bott runout. remove the bolt, place il in V blocks, and set
a dial gauge to the bolt at a point halfwav between the blocks. Tum
[A) the bolt to measure the runout. The amount 01 dial variation is the
amount olrunouL
*If runout exceeds the service limit, replace the bolt.
BoH Runoul
Stlnd.rd:
Sanlce Umtt
Under 0.1 mm
0.2 mm
SUSPENSION 11 -27
11 -28 SUSPENSION
STEERING 12-1
Steering
Table of Contents
Exploded View .. .. . " ... ... .. .... . .. ........................................................................... ....... 12-2
Spec ifications .....
........... .................... .............. ............ . .. ... ......................... 12-3
Steering ........................... ......... .... .............................................................................12-4
Inspection ..................................................................... ... ... .... ............................. 12-4
Adj ustment .............................. ................................... ......... .................................. 12-4
Stem, Stem Bearing Removal ...............................................................................12-5
Stem, Stem Bearing Installation ..........................................................................12-6
Steering M ai ntenance ............................................. ...... ......... .... .. ... ... .....................12-8
Stem Bearing Lubrication ..................... ........... .. .
..... ........... ..... .. .. ...... ... ...... 12-8
Stem Bearing Wear, Damage ..............
.. .............
...... ... 12-8
Stem Warp .......... ................... ... ............
. .. .......... ............... ....... ...... 12-8
, 2-2 STEERING
Exploded View
KX125 :
,-_1_-7
/
I
I
/
/
/
I
/
/
/
/
/
/
/
I
/
/
1
/
/
L ____ J
~~~~~
~
@[email protected]
KX125 :
®
7
r------ ---l
i:
I
~
~~~
'@
I
I
I
4
I
I
'-----T---KX250:
1. Handlebar Clamp
2. Handlebar
3. Steering Stem Head Nul
•• Locknut
•• Tapered Rolle, Bearing
••
7.
•• Tapered Roller e•• ring
Steering Slem Head Bracket
Head Pipe
,.
Steering Stem
: Apply greassllberally
T1 : 20 N-m (2.0kg-rn . 14.5 It-Ibl
G
T2 : 78 N·m 18 .0kg-m . 58 f1 -tb )
T3 : 22 N-m 12 .25kg-m. 16.3 It-Ibl
T4 : Tighten all snugly, then loosen.
Retighten to 3.9 N·m (0.4 kg-m, 35 In_lb)
T5 : 25 N-m (2.S kg-m , 18.0 ft-Ib)
STEERING 12-3
Specifications
Special Tools - Sleering Stem Bearing Driver. 57001 -137
Steering Stem ae.rlng Driver Adapter: 57001-1074
H.ad PIpe! OUter Race Preu Shaft: 57001-1075
Head Pipe OUter Race Driver: 57001·1076
SIeering Stem Nut Wrench: 57001·1100
Head Pipe OUter Race Driver: 57OO1-10n
Head Pipe OUter Race Remover: 57001·1107
Jack: 57001-1238
12-4 STEERING
Steering
Inspection
• Remove the front disc cover.
• Using the jack raise the front wheel off the ground.
Sp«:1aI
T~
- Jack: 57001-1238
. Wrth the front wheel pointing straight ahead, alternately nudge each
end of the handlebar. The front wheel should swing fully leh and right
from the force of gravity until the fork hits the sto p.
If the steering binds or catches before the stop, check the routing of
*
the cables, hoses, and harnesses.
* If the steering feels tight. adjust or lubricate the steering .
• Feel for steering looseness by pushing and pulling the forks.
*If you feel looseness, adjust the steering.
Adjustment
• Remove the front disc cover.
• For KX250 model, remove the number plate.
• Using the jack raise the front wheel off the ground .
Specla' Tool - Jltdr: 57001-1238
• Remove the handlebar.
• For KX125 model, loosen the front fork lower clamp bolts [AJ and
steering stem head nut (8].
• For KX250 model, loosen the front forte. upper clamp bolts, and remove
the steering stem head nut (8) and steering stem head [C) .
• Tum the steering stem locknut [A) wit h the steering stem nut wrench
(8) to obtain the proper adjustment
*If the steering is too tight,. loosen the stem locknu t a fraction of a turn;
if the steering is 100 loose, tighten the locknut a fraction of it turn.
Special Tool - steering Stem Nut Wrench: 57001 ·1100 [8 ]
NOTE
o Turn the locknut 7/8 turn at a time maximum.
STEERING 12-5
• For KX250 model, install the steering stem head .
• Torque the following:
Torque - Steering Stem Head Nut 78 N..m (8.0 kg.m, 58 It-fb)
Front Fortl Clamp Bolts:
Upper: 20 N..m (2..0 kg.m, 14.5 It-fb)
Lower: 22 N-m (2.25 kg-m, 16.3 It.fb)
eFor KX125 model, mount the handlebar clamps [ 8 ] so that the arrow
[C) on the clamp points to the front [AJ,
.For KX250 model, mount the handlebar clamp (AJ so that the cut side
(B] on the clamp points toward the rear .
• Torque the handlebar clamp bolts.
Torque -
Handle~r
Clamp BoI.. : 25 N-m (2.5 kg-m, 18 If·fb)
o Tighten the clamp bolts, front first and then the rear. If the handlebar
clamp is correctly installed, there will be no gap [ AJ al the front and a
gap [ 8) at the rear ahar tightening.
Stem. Stem Bearing Removal
. Remove:
Front Wheel
Seat
Side Covers
Radiator Covers
Fuel Tank
Brake Hose Clamp
Caliper M oun ting Bolts
Master Cylinder C lamp
Fron t Fender
Handlebar
Front Fork
12-6 STEERING
• Remove the steering stem head nut and washer.
• Remove the steering stem head .
• Pushing up on the stem base [A). and remove the steering stom
locknut [8 J, with the steering stem nut wrench (0 ]. then femOle the
steeting stem [e l and stem base.
Special Tool - Steering Stem Nut Wrench: 57001-1'00 [OJ
. Take off the upper stem bearing inner face (tapered roller bearing)
[AI _
• Drive out the bearing ou ter races from the head pipe.
o Remove the outer races pressed into the head p ipe. using the head
pipe outer race remover [A] . and hammer the head pipe outer race
remover to drive it out.
Special Tool - Heed Pipe Outer Race Remover: 57001·1101 [A)
NOTE
A
Olf either steering stem bearing is dam6ged. it is recommended that
both the UPPBf and lower bearing (including outer races) should be
'~/8ctK!
with nBW ones.
• Remove the lower stem bearing inner race (tapered toller bearing)
[ A] wilh its grease seal from the stem using suitable lools.
Stem. Stem Bearing Installation
• Replace the bearing outer race with new ones.
O Apply grease to the outer races, and drive them inlo the head pipe at
the same time using the head pipe outer rate press shaft [AJ and the
drivers [8J [C].
Sl*:1.1 TCJOf - Head Pipe OUter Race P,.... Sh.ft 57001-1075 [ A ]
Head Pipe OUter Race Drtver: 57001 -1076 [ BJ
Head Pipe Outer Race Driver: !57001·10n [ C]
STEERING 12-7
• Replace the lower Inner races w ith new ones,
o ApplV grease to the lower inner race, and drive it onto the stem using
the stooring stem bearing driver (Al and adapt er [ 8 ].
Special Tool - Sleering Stem a ••rlng Driver. 57001-137 [Al
Steering Stem a earlng OrIY.r Adapter: 57001 ·1074 [BJ
. Apply grease 10 the upper inner race. and install it in the head pipe.
• Install the stem through the head pipe and upper bearing. mstall the
slem cap and hand -tighten the locknut while pushing up on the stem
base.
rt:::::::-- - '"
>1
mm _ _ _
• Install the stem head and washer, and l ighten the stern head nul
lightly .
• Settle the bearings
In
place as follows:
~- .
OTighten the stem locknut 10 39 N -m (4.0 kg - m. 29 ft - Ib) of torque.
(To tighten the steering stem locknut to the specified torque, hook the
wrench [A J on the stem locknut, and pull the wrench at the hole by
22.2 kg force in the direction shown.)
Special Tool - Steering Stem Nut Wrench: 57001·"00 [ AJ
O Check that there is no play and the steering stem turns smoothly
Without rattles. If not. the steering stem bearings may be damaged.
OAgain back out the stem locknut a fraction of a turn until it turns lightly.
OTurn the stem locknut lightly clockwise until it Just becomes hard to
turn. Do not overtighten, or the steering w ill be too tight.
Torque - Sleering Stem Locknut 3.9 N--m (0.4 kg--m, 35 In-Ib)
.Install the front fork (see the Suspension chapter) .
NOTE
o Tighten the fork upper clamp bolts first.
next the stem head bolt. last
the fork lower clamp bolt.
Torque - Sleering Stem Head Nut 78 N--m (8.0 kg-m, 58 tt-Ib)
Front Forti Clamp Bolt:
Upper: 22 N· m 12.25 kg ·m, 16.3 ft ·lbl
lower : 20 N· m 12.0kg-m . 14.5 ft ·lbl
. Install the parts removed (see the appropriate chapter) .
i .. WARNING
00 not Impede the handlebar turning by routing the cables,
harneu.. and hoses Improperly (s.. the Genera l InlotmaUon
chapter).
• Check and adjust:
Steering
Front Brake
Clutch Cable
Throttle Cable
n
1 ~.
12-8 STEERING
Steering Maintenance
Stem Bearing Lubrication
e Remove the sleering stem (see Steering Stem Removal) .
• Using a high flash· point solvent. wash the upper and lower tapered
roll81'S In the cages, and w ipe the upper and lower outer races, which
are press-fined into the frame head pipe, clean off grease and dirt .
• Visuallv check the outer races and the rollers.
* Replace the bearing assemblies if they show wear or damage.
• Pack the UPp8f and lower tapered roller bearings [A] in the cages with
grease, and apply a light coat of grease to the upper and lower outer
races.
• 'nstall the steering stem, and adjust the steering (see Steering Stem,
Stem Bearing Installation, Steering Adjustmenl) .
Stem Bearing Wear, Damage
. Using a high flash -point solvent. wash the upper and lower tapered
rollers in the cages, and wipe the upper and lower outer races, which
are press-fined into the frame head pipe, clean off grease and dirt .
• Visually check the outer race and the rollers.
*
Replace the bearing assembly if
it show damage.
Stem Warp
. Whenever the steering stem is removed, or if the steering cannot be
adjusted for smooth action, check the steeting stem for straightness.
* If the steering stem shaft is bent, replace the steering stem.
ELECTRICAL SYSTEM 13-1
Electrical System
Table of Contents
Wiring Diagram ............ ..... .................................. .. 13 -2
Exploded View .................
................
....... 13· 3
Specifications ...................
................
....... 13· 4
Precautions and Safety Instructions .........
Electrical Wiring, .............. ........................
Inspection ........ ....... ........................
.... 13-5
..... 13· 6
.... .13· 6
Ignilion Timing ...............
.............................13·7
Ignition Timing Adjustment. ............
....... 13 -7
Flywheel Magneto
........................
.......... 13 -8
Aeflloval ....................................................... 13 -8
Installation Notes .................................. ........ 13 -9
Flywheel Magneto Inspection ...... ........ ........ 13 - 9
Ignition System .... ...............................
........ 13-10
Ignition Coil Removal ................
.......... 13·10
Ignition Coil Inspection .............
...... 13- '0
Spai'X Plug Cleaning and Inspection .......... 13-11
Spark Plug Gap Inspection ......................... 13-11
Igniter Removal ............................................13 -11
Igniter Inspection .........................................13 -12
Stator Coillnspection ..................................13· 13
, 3-2 ELECTRICAL SYSTEM
Wiring Diagram
Color Code
OK
8t&ck
G
Gree n
0
Q,angl!
R
R••
W
White
V
Yellow
ELECTRICAL SY STEM 1 3-3
Exploded V·lew
KX125 :
KX250:
4
1. Magneto Co,.,
2. Magneto
3. Stator
Aywheel
4. I.C. lgnHer
5. ignition Coli
6. Span: PI ug Cap
7 . Span: PI
,., .
...
N-m (2.2 kg-m
T2 :. 22
27 N-m
(2
, 18.0 ft-Ib)
T3 : 78 N-m (8::
20 ft-Ib)
g-m, 58 ft·lb)
:g-m,
13- 4
ELECTRICAL SYSTEM
Specifications
Standard
Item
Ign ition System :
Ignition timing :
KX125
KX250
15.8' BTDC @1 1 000 rl min (rpm)
, 4" BTOC @6 000 r/ min (rpm)
Ignition coil:
3 needle arcing distance
Primary wind ing resistance
Secondary winding resistance
Igniter internal resistance
Spark plug:
Type
KX125:
Gap
KX250:
Type
Gap
(A) : Australian model
(e) : Canadian model
(E) : European model
Special Tools -
Flywheel Puller: 57001 -252
Hand T• • ler: 57001 -983
Spartt Plug Wrench, H.. 21 : 57001-110
Coil THier. 57001 -1242
Flywheel Holder. 57001-131 3
7 mm or more
0.25 _ 0.37 Cl (at 20' C)
3.3 - 4.9 kCl (at 20' C)
Reterta 13 - 1 3
NGK R6254K -l05
(A)(C)(E) NGK R6252K -l 05
0 .7 - 0 .8 mm
NGK R6254E-9
(A)(C)(E) NGK R6252E·9
0.5 - 0 .6 mm
ELECTRICAL SYSTEM 13-5
Precautions and Safety Instructions
There are numbers of important precautions that are musts when
servicing electrical systems. Learn and observe all th e rules below.
OThe electrical pans should never be struck sharply, as with a hammer,
or allowed 10 faU on a hard surface. Such a shock to the pans can
damage them.
o Troubles may involve one or in some cases all items. Never replace a
defective part without determining what CAUSED the failure. If the
failure was caused by some o ther item or items, they too must be
repaired or replaced, or the new replacement will soon fail again.
o Make sure all connectors in the circuit are clean and l ight. and e)(amine
wires for signs of burning, fraying, etc.
Poor wires and bad
connections will affect electrical system operation.
o Measure coil and winding resistance when the part is cold (at room
temperature).
o Electrical Connectors
[A] Female Connectors
@
[ 8 ] Male Connectors
®
.nWARNING
The ignition system produces extremely high voltege. Do not touch
the sparl!. plug, high tension call, or sparil: plug lead while the engine
Is running, or you C04.IId receive 8 severe electrical shock.
13-6 ELECTRICAL SYSTEM
Electrical Wiring
Inspection
. Visually inspect the wiring for signs of burning, fraying. etc .
• ,1 any wiring is poor, replace the damaged wiring .
• Pull each connector apan and inspect it for corrosion, din, and
damage.
• ,f the connector is corroded or diny, clean il carefully.
If it is damaged,
replace it.
. Check the wiring for continuity.
O Use the wiring diagram to find the ends of the lead which is suspected
01 being a problem.
O Connect an ohmmeter between the ends of the leads.
O Set the meter to the 10: 10 range, and lead the meter.
* If the meter does nOI read 0 0 , the lead is defective.
or the wiring harness jf necessary.
Replace the lead
ELECTRICAL SYSTEM 13-7
Ignition Timing
Ignition Timing Adjustment
• Remove the magneto cover.
• Check to see If the center mark of the three markS [ B] on the magnelo
Slalor IS aligned w ith the mark [ A] on the crankcase.
* If the marks are not aligned, loosen the magneto Sialor screws (Cl and
turn the magneto stator [ 0 ] .
• Tighten the screws securely.
• Insta!lthe magneto cover.
The ignition timing can be adjusted for different power bands the suit
the rider's preference and ability.
• Remove the magneto cover.
• Loosen the stator screws.
• Adjust the timing by shifting t he stator position within the three lines
[AJ.
NOTE
oFor best engine performance. it is very important ·to adjust the
ignition timing within the edjustable renge just expleined.
A. Crankshaft Rotation
B. Stator Movement
C. Advance
O. Retard
. Tighten the stator screws securely .
• Install the magneto cover.
• Test ride the motorcycle and readjusl the ignition timing if necessary.
, 3-8 ELECTRICAL SYSTEM
Flywheel Magneto
Removal
• Remove the magneto cover .
• Unscrew the mounting screws [A). and remove the pickup coil [ 8J .
• Holding the ftywheel steady with the flywheel holder fB] remove the
flywheel bott (KX125) or nut (KX250) (A].
Special Tool - FIywhMI Holder: 57001·1313 [B]
• Remove the ftywheel holder.
• Screw the ftywheel puller [A] into the flywheel by turning it counterclockwise (Ieh-hand thread) .
• Remove the flywheel from the crankshaft by turning in the puller center
bolt and tapping the head of the bolt lightly with a hammer, while
holding the puller body steady. There is a woodruff key in the
crankshaft tapered portion.
Special Tool - Flywheel Puller: 57001·252 [A]
Henr atr•• 1M grab bar or 1M 1tywhet>1 ...... StrUling ttl. bar can
bend It.
flywheel Is atrudl, 1M magnets may 10.. their
magnetism .
"the
• Unscrew the mounting screws f AJ, and remove the stator plate [8]
and the wiring grommet [C],
• Disconnect the stator lead connectors from the igniter connectors.
ELECTRICAL SYSTEM 13-9
Installation Notes
. Using a high flash-point solvent, clean off any o il or d irt that may be
on the crankshaft taper [A] or in the hole [ 8] in the flywheel. Dry
them with a clean cloth.
e Set the stator
Wifing
grommet [A] securely in the notch
In
the left
crankshaft half, and route the wires ( 8] according to the Cable,
Harness, Hose Routing section in the General lnrormation chapter.
• Fit the woodruff key [A) securely in the slot in the crankshaft before
installing The flywheel.
,
I
.Holding the flyw heel steady, with the flywheel holder (A], and tighten
the flvwheel bolt (10<125) or nut (10<250) (8).
Speclal Tool - Flywheel Holder: 57001 ·1313
Torque - Flywheel80n (KX125): 22 N-m (2.2 kg-m, 16 ft-Ib)
Flywheel Nul (KX2S0): 78 N-m (8.0 kg-m, 58 tt-Ib)
. Replace the gasket with a new one.
Flywheel Magneto Inspection
There are three types of magneto problems: short, open (wire burned
out) , or loss in flywheel magnetism. A short or open in one of the coil
wires will result in either a low output, or no output at all. A loss in
flywheel magnetism, which may be caused by dropping or hitting the
flywheel. Of just by aging, will result in low output. Inspect the coils and
the flywheel (see Ignition System).
13-10 ELECTRICAL SYSTEM
Ignition System
Ignition Coil Removal
• Remove:
Side Covers
Seat
Radiator Covers
Fuel Tank
• Disconnect the ignit ion coil primary lead, engine stop bunon eanh and
igniter eanh leads [ A].
• Pull the plug cap [8) off the spark plug [e).
• Unscrew the mounting bolt, and remove the ignition coil [ D).
Ignition Coil Inspection
Measuring arcing distance:
The most accurate test for determining the condition of the ignition
coil is made by measuring arcing distance using a suitable commercially
available coil tester for the 3-needle method .
• Remove th e ignition coil.
e Connect the ignition coil (with the spark plug cap left installed on the
spark plug lead) fA] to the tester [8J, and measure the arcing distance.
To .lokl extremely high voltage shocb, do not touch the coil or lead.
* If the distance reading is less t han the spe<::ified value, the ignition coil
or spark plug cap is defective.
tgnltlon Coli Arcing Distance
Standard:
7 mm or more
. To detennine which pan is defective, measure the arcing distance
again with the spark plug cap removed from the ignition coil lead.
* If the arcing distance is subnormal as before, the trouble is with the
igOition coil itself. If the arcing distance is now normal, the trouble is
with the sparlt plug cap.
Measuring coil resistance:
If the arcing tester.s not available, the coil can be checked for a broken
or badlV shoned winding wit h an ohmmeter. However, an ohmmeter
cannot detect layer shorts and shorts resulting from insulation
breakdown under high voltage.
• Remove the ignit ion coil .
• Measure the primary winding resistance [A].
C Connect an ohmmeter between the coil tenninals.
ELECTRICAL SYSTEM 13-11
Set the meter to the x 1 n range, and read the meter.
M easure the secondary winding resistance [6].
Aemove the plug cap by turning it counterclockwise.
Connect an ohmmeter between the spark plug lead and the ground
lead terminal.
o Set the meter to the x 1 kO range, and read the meter.
If the meier does not read as specified, replace the coil .
• It the meter reads as specified, the ignition coil windings are probably
good. However, if the ignition system still does not perform as it
should after all other components halle been checked, test replace the
coil with one known to be good.
o
•
o
o
*
ignition Coli Winding Resistance
Primary windings:
0.25 _ 0.37
Secondary windings:
0 (SIlO·C)
3.3 - 4.9 kO lat 20' C)
. Check the spark plug lead for visible damage.
* If the spark plug lead is damaged. replace the coil.
Spark Plug Cleaning and Inspection
• Remove the spaf'i( plug, and visually inspect it
. Clean the spar!< plug, preferably in a sandblasting device, and then
clean off any abrasive panicles. The plug may also be cleaned using
a high flash point solvenl and a wire brush or other suitable tool.
If the spark plug electrodes are corroded or damaged, or if the insulator
is cracked, replace the plug. Use the standard spark plug.
*
Spark Plug Gap Inspection
. Measure the gap [AJ with a wire-type thickness gauge.
If the gap is incorrect, carefully bend the side electrode [BJ with
*
suitable tool to obtain the correct gap.
Spatit Plug Gap
Standard:
NGK R62.54K-105
KX125
NGK R6252K-105
0.7 - 0.6mm
NGK R6254E-9
KX2!O
NGK R8252E-9
0 .5 - 0.6 mm
Igniter Removal
• Remove:
Side Covers
Seat
Radiator Covers
Fuel Tank
• Disconnect the igniter lead .
• Unscrew the mounting bolts [AJ, and remove the igniter [8].
8
13-12 ELECTRICAL SYSTEM
Igniter Inspection
_ Set the hand tester to the )( 1kO range, connect the tester to the
terminals in the igniter lead, and check the internal resistance following
t he table.
* If the readi ngs do not correspon d to t he table, replace the igniter.
Sped'i Tool - Hand Te.ter. 57001-983
CAIITlON
U.e only the Kawa.akl Hanel THter lor thl. lelt. A 'uter other than
the Kawa . .1Hand THier may Ihow different reading •.
Do not u. . . m8ggef or. meter with. large capacity battery, Of the
igniter will be damaged.
ELECTRICAL SYSTEM 13-13
Igniler Tester Using the Kawasaki Hand Tester
Testat Positive (+) lead Connection
lead Color
BK/ Y
(Ground)
BK/ Y
BK/ W
R
aK
W
BK/ R
W/ R
WIG
(Ground)
(SlOP)
(Exciter)
(Ign. Coil)
(Exciter)
( Exciter)
(Pickup)
(Pickup)
6.8 - 19.2
2.2-4.7
00
00
2.2 - 4.8
0
7.7 - 13.4
00
~
00
00
00
00
00
00
1'6-330
2.2 - 4.6
~
00
00
2.0 - 4.4
22.7 - 120
6.8 - 18.2
~
00
7.0 - 19.4
2.0 - 4.4
12.8 - 24.4
00
2.2-4.7
00
00
~
00
00
00
44 - 114
over 360
108 - 540
00
00
~
44 - 114
68 - 180
0
6.8-1 9.2
2.2 - 4.7
00
00
2.2- 4.8
~
7.7-13.4
00
00
13.6 - 26.4
8 .0 - 13.8
~
BK/ W
0
(Stop)
.2
~c
0
0
"•
~
•
-'
-.!.
•
.~
!,
z•
$"
•
~
R
(Exiler)
aK
( Igo. Coil)
W
(Exciter)
BK/ A
(bcller)
272 - 1200 116 - 330
W/ R
(Pickup)
WI G
8 .0 - 13.8
(Pickup)
co
: Infinity
Range
: xlkO
Unit
: kO
24 - 54.6 . 13.4 -25.8
Stator Coil Inspection
• Remove:
Side CovetS
Soot
Radiator Covers
Fuel Tank
.D isconnect the magneto lead .
• Zero the ohmmeter. and connect it as shown in the table.
Stator Coli RMistance <at 2O"C)
Connections
Reading
Whitef Red -White/ Green
396 - 594 0
Red - Black/Red
288 _ 432 0
White - Rad
14 - 210
Color
Code
aK
Black
G
Green
0
Orange
R
Red
W
White
y
Yellow
128 - 420
~
13-14 ELECTRICAL SYSTEM
a Note the resistance reading.
*If there is more resistance than shown in the table, the stator has a
broken wire, the leads between the stator and the connector are open,
or the connections are bad. Check the stator and the leads, and fix or
replace the damaged parts.
* If there is much less resistance than shown in the table. the stator is
shorted. or the leads between the stator and the connector is
grounded. Check the stator and the leads, and fi x or replace the
damaged parts.
APPENDI X 14-1
Appendix
Table of Contents
Troubleshooting Guide ............ .............
.......................................................... 14-2
Engine Doesn't Start: Starting Difficulty .............................................................. 14-2
Poor Runn ing at Low Speed ................................................................................14- 2
Poor Running or No Power at High Speed ......................................................... 14-2
Overheating ...........................................................................................................14-3
Clutch Operation Faulty .......................................................................................14-3
Gear Shifting Faulty ..............................................................................................14-3
Abnormal Engine Noise ......................................................................................14-3
Abnormal Drive Train Noise .................................................................................14-4
Abnormal Frame Noise .......................................................................................14-4
Exhaust Smoke .....................................................................................................14-4
Handling and/ or Stability Unsatisfactory .............................. ............................... 14-4
Brakes Don't Hold ................................................................................................14-4
General lubrication ...................................................................................................14-5
lubrication ........................................................................................................14-5
Unit Conversion Table ..............................................................................................14-6
Prefixes for Units ...................................................................................................14-6
Units of Mass ........................................................................................................ 14-6
Units of Volume ........ ...........................................................................................14-6
Units of Force .......................................................................................................14-6
Units of length ....................................................................................................14-6
Units of Torque ...................................................................................................14-6
Units of Pressure ...................................................................................................14-6
Units of Speed ........... ...........................................................................................14-6
Units of Power ......................................................................................................14-6
Units of Temperature ............................................................................................14-6
14· 2 APPENDIX
Troubleshooting Guide
o This
NOTE
is not an exhaustive list. giving every possible
cause (Of each pfobfem listed. It is meant simply as 8
lough guide to assist the troubleshooting (or some of
the mole common difficulties.
Engine Doesn't Start; Starting Difficulty:
engine won't tum over.
Cylinder, piston seizure
Crankshaft seiZUre
Connecting rod small end seizure
Connecting rod big end seizure
Transmission gear or bearing seizure
Kick shaft return spring broken
Kick ratchet gear not engaging
No fuel flow:
No fuel in tank
Fuel tap turned off
Tank cap air vent obstructed
Fuel tap clogged
Fuel line clogged
Float valve clogged
engine flooded:
Float level too high
Float valve worn or stuck open
Starting technique faulty
(when flooded, kick with the thronfs fully open to
allow more air 10 reach the engine.)
No tpar1l; ..,ark w••k:
Spark plug d irty, broken, or maladjusted
Spark plug cap or high tension wiring trouble
Sparit plug cap nOI in good contact
Sparit plug incorrect
Igniter trouble
Ignition coil trouble
Ignition coil resistor open
Flywheel magneto damaged
Wiring shorted or open
FueU.lr mtxture Incornd:
Idle adjusting screw maladjusted
Slow jet or air passage clogged
Air cleaner clogged, pooriV sealed, or missing
Starter jet clogged
Compre..1on Low:
Span.: plug loose
Cylinder head not sufficietltly tightened down
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or sticking)
Piston ring/land clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Cylinder base gasket damaged
Reed valve damaged
Cylinder nut loose
Poor Running at Low Speed:
~111
••U:
Sparit plug dirty, broKetl, or maladjusted
Spark plug cap or high tension wiring trouble
Spark plug cap shorted or not in good contact
Spark plug incorrect
Igniter trouble
Ignition coil trouble
Flywheel magneto damaged
Ignition coil lead or igniter lead not in good contact
Fuel/air mixture Incorrect
Idle adjusting screw maladjusted
Slow jet or air passage clogged
Air cleaner clogged, poorly sealed, or missing
Starter plunger stuck open
Float level too high or too low
Fuel tank air vent obst ructed
Carburetor holder loose
Air cleaner duct loose
ComprH.ion k)W!
Spark plug loose
Cylinder head nOI sufficiently tightened down
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or sticking)
Piston ring/land clearance eICcessive
Cylinder head gasket damaged
Cylinder head warped
Cylinder base gasket damaged
Reed valve damaged
Cylinder nut loose
KIPS porta.tuck open:
KIPS exhaust valve stuck open (valve seizure, or
carbon accumulation)
KIPS exhaust valves assembled incorrectly
Exhaust advancer spring damaged
Exhaust valve operat ing rod seizure
Rod (for KIPS) seized in cylinder
Other.
Igniter trouble
Transmission oil viscosity too high
Brake dragging
Poor Running or No Power at High Speed:
Firing Incorrect
Spant plug dirty, damaged, or maladjusted
Sparit plug cap or high tension wiring damaged
Spark plug cap shorted or not in good contact
Spark plug incorrect
Igniter trouble
Ignition coil trouble
Flywheel magneto damaged
Ignition coil lead or igniter lead not in good contact
Fuel/air mhrtura IncOtTect
Main jet clogged or wrong size
Jet needle or needle jet worn
Jet needle clip in wrong position
Float level too high Of too low
Air jet or air passage clogged
Air cleaner clogged, poorly sealed, or miSSing
Starter plunger stuck open
Fuel to carburetor insufficient
Water or foreign matter in fuel
Fuel tank air vent obstructed
Carburetor holder loose
Air cleaner duct loose
Fuel tap clogged
Fuel tine clogged
APPENDIX 14-3
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened down
Cylinder, plSlon worn
Piston ring bad (worn. weak, broken, or slicking)
Piston ring / land clearance e)(cessive
Cylinder head gasket damaged
Cylinder head warped
Cylinder base gasket damaged
Reed valve damaged
Cylinder nut loose
Eng ine rpm w ill not rise prope rly:
Statter plunger stuck open
Float level tOO high or tOO low
Main jet clogged
Throttle valve does not fully open
Air cleaner clogged
Muffler clogged
Water or foreign matter In fuel
Cyhnder exhaust port clogged
Brake draggmg
Clutch slipping
Overheating
Transmission oilleve[ too high
TransmiSSion oil viscosity too high
Crankshaft bearing worn or damaged
KIPS ports stuck closed:
KIPS ports stuck closed
KIPS exhaust valves stuck closed (valve seizure,
or carbon accumulation)
KIPS exhaust valves assembled incorrectly
KIPS ports clogged (carbon accumulation)
Exhaust valve operating rod seizure
Rod (for KIPS) seized in cylinder
Knodclng:
Carbon built up in combustton chamber
Fuel poor quality or tncorrect
Spark plug incorrect
Ign iter trouble
Overheating:
Firing lnccM'rect
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
Igniter trouble
Fuel/ai, m ixture Incorrect:
Main jet clogged or wrong size
Fuel level in carburetor lIoat bowl too low
Carburetor holder loose
Air cleaner poorly sealed, or missing
Air cleaner duct poorly sealed
Air cleaner clogged
Compression high:
Carbon built up in combustion chamber
Engine load laulty:
Brake dragging
Clutch slipping
Transmission oil level too high
Transmission oil viscosity too high
LubrlcaUon Inadequate:
Transmission oil level too low
Transmission oil poor quality or incorrect
Coolant Incorrect:
Coolant level too low
Coolant deteriorated
Cooling system component Incorrect
Radiator clogged
Radiator cap nouble
Water pump not ro tating
Clutch Operation Faulty:
Clutch sUpping:
No clutch lever play
Clutch cable maladjusted
Clutch inner cable catching
Friction plate worn or warped
Steel plate worn or warped
Clutch spring broken or weak
Clutch release mechanism trouble
Clutch hub or housing unevenly worn
Cklk:h not disengaging properly:
Clu tch lever play excessive
Clutch plate warped or too ro ugh
Clutch spring tension uneven
Transmission oil deteriorated
Transmission viscosity too high
Transmission oil level too high
Clutch housing frozen on drive shaft
Clutch release mechanism trouble
Gea r Shifting Faulty:
Doesn't go Into gear; ahlfl pM1II l doesn't retum:
Clutch not disengaging
Shift fork bent or seized
Gear stuck on the shaft
Gear positioning lever binding
Shift ret urn spring weak or broken
Shift return spring pin loose
Shift mechanism arm spring broKen
Shift mechanism arm broken
Shift drum broken
Jumps out of gear.
Shift fork worn
Gear groove worn
Gear dogs and/or dog holes worn
Shift drum groove worn
Gear positioning lever spring weak or broken
Shift fork guide pin worn
Drive shaft, output shaft. and/ or gear splines worn
Overshlft:l:
Gear positioning lever spring weak or broken
Shift mechanism arm spring broken
Abnormal Engine Noise:
Knocking:
Igniter trouble
Carbon built up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect
Overheating
Piston slap:
Cylinder/piston clearance elCcessive
Cylinder, piston worn
Connecting rod bent
14-4 APPENDIX
Piston pin, piston pin holes worn
Other no. .:
Connecting rod small end clearance excessive
Connecting rod big end clearance excessive
Piston ring worn, broken or stuck
Piston seizure or damaged
Cylinder head gasket leaking
Exhaust pipe leaking at cylinder head connection
Crankshaft runou! excessive
Engine mounts loose
Crankshaft bearing worn
Primary gear worn or chipped
Abnormal Drive Train Noise:
Clutch no ...:
Clutch housing/friction plate clearance excessive
Clutch housing gear/primary gear backlash
excessive
Metal chip jammed in clutch housing gear teeth
Trensmlulon noM:
Crankcase bearing worn or damaged
Transmission gear worn or chipped
Metal chip jammed in gear teet h
Transmission oil insufficient or too thin
KiCk ratchet gear not properly diserlgaging from
kick gear
Output shaft idle gear worn or chipped
Drive chain nols.:
Drive chain adjusted improperly
Chain worn
Rear and / or engine sprocket(s) worn
Chain lubrication insufficient
Rear wheel misaligned
Abnormal Frame Noise:
Front forti no ...:
Oil insufficient or too thin
Spring weak or broken
Rear shodt absorber noi..:
Shock absorber damaged
Disc brat. noise:
Pad installed incorrectJy
Pad surface glazed
Disc warped
Caliper trouble
Cylinder damaged
OthernolM
Bracket. nut, bah, etc. not properly mounted or
tightened
Exhaust Smoke:
Excessive white smoke:
Throttle cable maladjusted
Brownish tmoke:
Air cleaner clogged
Main jet too large or fallen out
Starter Plunger stuck open
Float level too high
Handling and/ or Stability Unsatisfactory:
Handlebar IuIrd to tum:
Control Cable routing incorrect
Wiring routing incorrect
Steering stem locknut too tight
Bearing roller damaged
Bearing race dented or worn
Steering stem lubrication inadequate
Steering stem bent
Tire air pressure too low
Handlebar shakes or eJlCHIivety -.,lbrates:
Tire worn
Swing arm sleeve or needle bearing damaged
Rim warped, or not balanced
Front, rear axle runout excessive
Wheel bearing wom
Handlebar clamp loose
Steering stem head nut loose
Handlebar pul.. to one aide:
Frame bent
Wheel misalignment
Swing arm bent or twisted
Swing arm pivot shaft runout excessive
Steering maladjusted
Steering stem bent
Front fork leg bent
Right/ left front for( oil level uneven
Shodt absorption unaatisiactory:
(Too hard)
Front for( oil excessive
Front for( oil viscosity too high
Front fork leg bent
Tire air pressure too high
Rear shock absorber maladjusted
(Too soft)
Front lor( oil insufficient and / or leaking
Front fork oil viscosity too low
Front fori<., rear shock absorber spring weak
Rear shock absorber gas leaking
Rear shock absorber maladjusted
Brakes Don't Hold:
Air in the brake line
Pad or disc worn
Brake fluid leak
Disc warped
Contaminated pads
Brake fluid deteriorated
Primary or secondary cup damaged
Master cylinder scratched inside
Brake maladjustment (lever or
excessive)
pedal
play
APPENDIX 14-5
General lubrication
Lubrication
• Before lubricating each part, clean off any rusty spots with rust remOV6f
and wipe off any grease, oil, dirt. or grime .
• Lubricate the pomts listed below with indicated lubricant.
NOTE
o Whenever
the vehicle has been operated under wet or rainy
conditions, or especially after using a high.pressure water spray,
perform the genera/lubric8tion.
Pivots: Lubricate with Motor Oil.
Clutch Lever
Brake lever
Kick Pedal
Shih Pedal
Rear Brake Rod Joint
Drive Chain
Points: Lubrica te with Grease.
Clutch Inner Cable Upper and lower Ends
Throttle Inner Cable Upper Ends
Swing Arm Pivot
Tie-Rod Pivot
Rocker Arm Pivot
Steering Stem Bearing
Cables: lubricate with Rust Inhibiter.
Thronle Cable
Clutch Cable
Specla' Tool - Pre•• ure Cable Luber:
K56019~21
[A)
-
,
14-6 APPENDIX
Unit Conversion Table
Units of Torque:
Prefixes for Units-
Prefix
Symbol
mega
kilo
centi
milli
micro
M
k
Power
I(
c
m
"
II
1.000,000
)( 1,000
)I 0.0 1
I( 0 .001
0.000001
N-m
N-m
N-m
x
kg-m
kg-m
kg-m
x
0.1020
0.7376
8.851
x
x
x
x
=
=
kg-m
-
h-Ib
9.807
7233
86.80
=
=
=
N-m
h-Ib
0.01020
0.1450
0.7501
=
=
kg/cm 1
in-Ib
in-lb
Units of Pressure:
Units of Mass:
kg
g
2.205
0.03527
x
x
=
-
Units of Volume:
L
L
L
L
L
L
mL
mL
mL
--
0.2642
0.2200
1.057
0.8799
2.113
1.816
0.03381
0.02816
0.06102
x
x
x
x
x
x
x
x
x
=
=
=
Ib
0'
gal (US)
gal (imp)
ql (US)
qt (imp)
pint (US)
pint (imp)
oz (US)
oz (imp)
x
kg
kg
x
x
x
=
=
kg
Ib
9.807
2.205
=
=
N
Ib
0.6214
3281
0.03937
--
mile
h
In
Units of length:
km
m
mm
x
x
x
kg /cm ~
x
kg/cm2
em Hg
x
x
x
98.07
14.22
1.333
x
km/ h
-
psi
em Hg
=
=
kPa
ps'
kPa
x
0.6241
=
mph
1.360
1.341
=
-
HP
0.7355
0.9863
=
Units of Power:
cu in
0.1020
0.2248
x
Units of Speed:
Units of Force:
N
N
kPa
kPa
kPa
kW
kW
x
PS
PS
x
x
x
PS
kW
HP
Units of Temperature:
9{·C·.0 )
5
'F
- 40
-40
'C
-20
-.•
- 20 1
-17. a
- .0
=
32
20 i 4O
. " ..
• !
20 1
i
•••
5{·f·. 0)
'f
26.7
9
to.
100 !
I
40
120
14.
- .0
m
160
1180 200 ! 220
... , . .
71. 1
'12
=
,
100
, ~,
'C
'48
,
240 1 260
f 120
116
'84
28.
!140
'"
'F
JOO
'"
16 •
'C
SUPPLEMEN T - 1993 MODEL 15-1
Supplement - 1993 Model
This supplement chapter contains only the information unique to the models covered. Also read the base
model chapters in front of this chapter for complete service information .
Models covered by this chapter
1993
1993
KX125-J2
KX250 -J2
Base Models
1992
1992
KX125-J1
KX250-J1
Table of Contents
Model Identification ..................................................................................................15-2
General Specificalions-l ........................................................................................... 15·4
General Specifications-2 ............................. :.............................................................15-6
Torque and locking Agent ............................................. ....... ................................... 15-8
Fuel System
Specifications ............................................................................................................ 15-9
Cooling System
Specifications .............................................................. .......... ....... ..........................1 5-10
Engine Top End
Exploded View ... ............. ...................................................................................... .15-11
Specifications ..........................................................................................................15-' 2
Exhaust Valve (KIPS) .............................................................................................15-13
Removal ..............................................................................................................15-13
Installation Notes ................................................................................................15-14
Right Engine Cover .................................................................................................15-19
Installation Notes ................................................................................................ 15-19
Disassembly ........................................................................................................15-20
Exhaust Advancer Disassembly/Assembly Notes ............................................. 15-21
Assembly Notes ...... ............................................................................................15-21
Suspension
Specification ... ......................................................................................................... 1 5- 23
15-2 SUPPLEMENT - 1993 MODEL
Model Identification
KX126-J2 Left Side View
KX!2li-J2 Right Side VI_
SUPPLEMENT - 1993 MODEL 15-3
KX260· J2 Left Sid. View
KX25O-J2 Right Sid. View
15-4 SUPPLEMENT - 1993 MOOEl
General Specifications - 1
Items
KX125-J2
Dimensions:
Overall length
Overall width
Overall height
Wheelbase
Road clearance
Seat height
Dry weight
Curb weight:
Front
Rear
Fuel tank capacity
2160 mm
815 mm
121Smm
1470 mm
39Smm
950mm
86.5 kg
45.5 kg
48.5 kg
8.5 L
Engi ne:
Type
Cooling system
Bore and stroke
Displacement
Compression ratio
Maximum horse power
Maximum torque
Carburation system
Starting system
Ignition system
Ign ition timing
Spark plug
Port timing:
Inlet
Open
Close
Scavenging
Open
Close
Exhaust
Open
Close
Lubrication system (Gasoline: oil)
2-stroke, single cylinder. crankcase reed valve
Liquid -cooled
64.0 x 54.5 mm
124 mL
Low speed : 9.1 : 1
High speed : 8.1 : 1
29.1 kw (39.6 PS) @11 500 ,/ mln('pm)
25.01 N-m (2.55 kg -m, 18.4 h-Ib) @11 000 rl min (rpm)
Carburetor, KEIHIN PWK36
Primary kick
COl
14.5' BTDC @11ooo rl min (rpm)
NGK R6254K-l05. (A) (C) (E ) NGK R6252K-l05
Full open
65.5' 8BDC
65.5' ABDC
86.0' 88DC (low speed). 95' B8DC (high speed)
86 .0' ABDC (low speed), 95' ABDC (high speed)
Petrol mix (32:1) using 2-stroke racing oil
Orive Trai n:
Primary reduction system:
Type
Reduction ratio
Clutch type
Transmission :
Type
Gear ratios:
lSI
2nd
3,d
4th
5th
6th
Final drive system:
Type
Reduction ratio
Overall drive ratio
Transmission oil:
Grade
Viscosity
Capacity
Gear
3.500 (56/16)
Wet, multi disc
6 -speed, constant mesh, return shift
2.142 (30/ 14)
1.714 (24/ 14)
1.400 (28/ 20)
1.181 (26/ 22)
1.041 (25/ 24)
0.920 (23/ 25)
Chain drive
4.083 (49/ 12)
[email protected]
SE ctass
SAE 1OW-30 or 10W-40
0.7 L
(Continued on next page.)
SUPPLEMENT - 1993 MODEL 15-5
Items
KX125 -J2
Frame :
Type
Steering angle
Caster (rake angle)
Trail
Front tire:
Make/ Type
Rear tire:
Size
Make/Type
Size
Tubular, semi -double crad le
45· to either side
25.5"
105 mm
DUN LOP K490. ( E) DUNLOP D752. Tube type
80/ 100- 2151M
DUNLOP K695. (E) DUNLOP D752. Tube type
100/ 90 - 1957M
Telescopic fork (upside down)
310 mm
Swing arm (Uni-trak)
Front suspension :
Type
Rear suspension :
Type
Wheel travel
Front and Rear
330mm
Brake type:
Front
Rear
220mm
190 mm
Wheel travel
Single disc
Effective disc diameter:
Specifications subject to change without notice. and may not apply to every country.
(A) : Australian model
(C) : Canadian model
(E) : Eu ropean model
15-6 SUPPLEMENT - 1993 MODel
General Specifications - 2
KX250-J2
Items
Dimensions:
Overall length
Overall width
Overall height
Wheelbase
Road clearance
Seat height
Dry weight
Curb weight:
Front
Rear
Fuel tank capacity
2185 mm
815mm
1 215mm
1490 mm
385mm
955mm
96 .5 kg
50 kg
52 kg
8.5 L
Engine:
Type
2-stroke, single cylinder, piston reed valve
Liquid-cooled
Cooling system
Bore and stroke
Displacement
Compression ratio
Maximum horsepower
Maximum torque
Carburation system
66.4 x 72.0 mm
249mL
10.2 , 1 (low speed) , 8.7 , 1 (high speed)
Starting system
39.4 kW (53.6 PS) @8 500 rl min (rpm)
49.0 N-m (5.0 kg -m, 36 ft- Ib) @7 500 rl min (rpm)
Carburetor. KEIHIN PWK38
Primary kick
Ignition system
Ignition timing
Spark plug
Port timing:
Inlet
14' BTDC @6 000 rl min (rpm)
NGK R5254E -9, (A) (C) (E) NGK R6252E-9
Full open
cal
Open
Close
Scavenging
Open
Exhaust
Close
Open
Close
Lubrication system (Gasoline: oil)
50- 8BOC
60- ABOC
80,5- BBOC (low speed) , 92.5- BBOC (high speed)
80.5- ABOC (low speed), 92,5- ABOC (high speed)
Petrol mix (32:1) using 2-stroke racing oil
Drive Train :
Primary reduction system:
Clutch type
Transmission :
Type
Gear
Reduction ratio
2.750 (55 /20)
Type
Gear ratios:
Wet. multi disc
5-speed, constant mesh, return shift
1st
2nd
3,d
4th
5th
Final drive system:
Overall drive ratio
Transmission oil:
Type
Reduction ratio
Grade
Viscosity
Capacity
2.133
1.587
1.388
1.136
1.000
(32 /15)
(27 /16)
(25 /18)
(25/ 22)
(24/ 24)
Chain drive
3 .500 (49/14)
9.625 @Top gear
SE class
SAE 1OW-30 or 10W-40
0 .85 L
(Continued on next page.)
SUPPLEMENT - 1993 MOOEl 15-7
Items
KXZ50-J Z
Fram e:
Type
Tubular. semi -double cradle
Steering angle
45' to either side
Caster (rake angle)
26-
Trail
Front tire:
108 mm
Make/ Type
Size
Make/Type
Size
Front suspension :
Type
Rear tire:
Rear suspension :
Brake type:
Effective disc diameter:
Wheel travel
Type
Wheel travel
Front and Rear
Front
Rear
DUNLOP K490, (E) 0752, Tube type
80/ '00- 2'5' M
DUNLOP K695, (E) 0752, Tube type
110/ 90- '962M
Telescopic fork (upside down)
310 mm
Swing arm (Uni-trak)
330mm
Single disc
220mm
190 mm
Specifications subject to change without notice. and may not apply to every country.
(A) : Australian Model
(C) : Canadian Model
(E) : European Model
15-8 SUPPLEMENT - 1993 MODEL
Torque and locking Agent
Refer 10 p.1 · 11 noting the following.
Torque
Fastener
Remarks
Engine Top End :
Cylinder Head Nuts
Spark Plug
Coolant Drain Plug (Cylinder)
Cylinder Nuts
IK(125)
IK(250)
Engine Brackets Mounting Nuts(Engine Side)
( Frame Side)
Shaft Lever Nut
Operating Rod left Side Plug
Main Lever Mounting Allen 80lt (KX125)
Main Shaft Nut
Elbow Fitting Bolts (KX250)
Carburetor Holder Mounting Bolts
Main Valve Rod Cover Screw
Main Lever Mounting Allen Bolt
Main Valve Cover Bolts (KX250)
Main Valve Screws (KX250)
N -m
kg - m
ft -Ib
25
27
21
25
34
34
26
8.8
15
3.9
8.8
2.5
2.8
2.1
2.5
3.5
3.5
2.7
0.9
1.5
0.4
0.9
18.0
20.0
15.0
18.0
25
25
19.5
S.S
S.S
4.9
3.9
5.9
5.9
0.9
0.9
0.5
0.4
0.6
0.6
78 in-Ib
"
35 in - Ib
78 in - Ib
78
78
43
35
52
52
in - Ib
in - Ib
in - Ib
in - Ib
in - Ib
in - tb
Left-hand
threads
SUPPLEMENT · 1993 MODEL 15·9
Fuel System
Specifications
KX125 :
Item
Throttle grip fr ee play
Standard
2 - 3mm
Carburetor :
Make/ type
Main jet
Throttle valve cutaway
Jet needle
Jet needle clip position
Slow jet
Air screw
Service fuel level
Main Air Jet
Float height
Service Limit
---
-------
KEIHIN PWK36
# 168
#5
N1 8M. (E) N1 A L
3rd groove from the top
# 50.( E)# 52
, % (turns out)
2 mm above - 0 mm below
the float bowl mating surface
#200
16 ±2 mm
---
High -quality foam-air filter oil
---
---
---
---
-----
Ai r Cleaner :
Element oil
Reed V alve:
---
Reed warp
O.2mm
KX250 :
Standard
Item
Throttle grip free play
2 _ 3mm
Ca rburetor:
Make/ type
Main jet
Throttle valve cutaway
Jet needle
Jet needle clip position
Slow jet
Air screw
Service fuel level
Main air jet
Float height
KEI H IN PWK38
#162
#7
NOZF
3rd groove from the top
# 50
1 % (turns out)
2 mrn above - 0 mm below
the float bowl mating surface
#200
16 ±2 mm
Air Cleaner :
Element oil
Hig h-qual ity foam -air filter oil
Reed Valve :
Reed warp
---
Special Tools -
Fuel l e vel Gauge, M18 x 1.0: 57001 -122
Pressure Cable luber: k56019-021
Se rvice limit
-------------------
---
--O.2mm
15-10 SUPPLEMENT - 1993 MODEL
Cooling System
•
Specifications
Refer to p 3-4 noting the following
Item
Standard
Coo lant Provided when Shipping :
Tatal amount
1.15 L
SUPPLEMENT - 1993 MOOEL 15-11
Engine Top End
Exploded View
~
1.
2.
3.
V
Spark Plug
Engine Bracket
Cylinder Head
Cylinder
••
••
••
7. Exhaust Valve(Rlghl}
••
9. 0-<,,,,,
Operating Rod
Exhaust Vatve (left)
Guide
10. Idle Gear
11 . Guido
1~
13.
14.
15.
Main Valve Cover
Main Lever
V.lYe Holder
P'n
'~
"
31 .
3~
16.
17.
18.
19 .
20.
21.
22.
23.
2• .
2• .
26.
27.
2'.
29.
30.
Main Exhaust Valve(Large)
Main Exhaust Valve(Small)
Roller
Main Valve Rod Covar
Main Valve Rod
Main Shaft
Main Valve Ge.r
RHOnatot' Cover
Elbow Fltting:
Shaftlenr
Piston Ring
P~"'"
Mart
"R~
Arrow muat point forward
Platon Pin
33.
34.
35.
G,
Lh'
M,
0,
T1 ,
carburetor Holder
Expansion Chamber
Rubber Sea'
Gnlel
Silence,
Apply gr.....
Left-hand Threads
Apply Molybdenum dlsuHlde gre•••.
T3,
T4:
Apply 2..troke engine 011.
27 N-m(2.8 kg-m , 20 ft-Ib)
26 H-m(2.7 kg-m, 19.5 flolb)
34 N-m(3.S kg.m, 2S ft-Ml;)
25 N-m(2.S kg-m, 18 ft-Ib)
T5:
T6:
15 N-m(1 .5 ko-m, 11 .0 ft-Ib)
n,
T7,
.,.,
TlI'
no:
21 N-m (2.11tR"'" . 15 ft. lb)
8.8 N-m(O.i kg-m , 78 In.lb)
4.9 N-m (C.5 kg-m, 43 In-Ib)
3.9 H-m (0.4 kg-m , 35 In-Ib)
5.9 N-m(O.6 kg-m , 52In-lb)
15-12 SUPPLEMENT - 1993 MODEL
Specifications
KX125 :
Cylinder Head :
Cylinder compression
Service limit
Standard
Item
---
(usable range)
770 - 1 200 k Pa
(7.7 - , 2.0 kg/cm 2 , 109 _ 171 psi)
Cylinder head warp
Cylinder. Piston :
Cylinder inside diameter
Piston diameter
Piston/cylinder clearance
Piston ring / groove clearance
Piston ring groove width
Piston ring thickness
Piston ring end gap
Piston pin diameter
Piston pin hole diameter
Small end inside diameter
---
O.03mm
54.000 - 54.015 mm
53.943 _ 53.958 mm
0.052 - 0.062 mm
0.04 _ 0.08 mm
1.03 -1 .0Smm
0.97 - 0.99 mm
0.35 - 0.55 mm
15.995 - 16.000 mm
16.000 - 16.020 mm
21.003 - 21.014 mrn
54.11 mm
53.80mm
--0.18 mm
1.10mm
0.90 mm
0.90 mm
15.96mm
16.07 mm
21.05 mm
KX250 :
Standard
Ite m
Service limit
Cylinder Head:
---
Cylinder compression
(usable range)
780 ,., 1 220 k Pa
(7.8 - 12.2 kg / cm2, 111,., 173 psi)
Cylinder head warp
---
0.03 mm
66.400 _ 66.415 mm
66.336 - 66.351 mm
0.059 - 0.069 mm
0.04 _ 0 .08 mm
1.23 - 1.25 mm
1.17 - 1.19 mm
0 .25 - 0 .45 mm
17.995 _ 18.000 mm
18.000 - 18.020 mm
22.003 - 22.01 2 mm
66.48mm
66. 19 mm
Cylinder, Piston :
Cylinder inside diameter
Piston diameter
Piston/ cylinder clearance
Piston ring/ groove clearance
Piston ring groove width
Piston ring thickness
Piston ring end gap
Piston pin diameter
Piston pin hole diameter
Small end inside d iameter
--0. 18 mm
1.30 mm
1.10mm
O.75mm
17.96mm
18.07 mm
22.05 mm
PIn:In diameter
(A): KX125 - 10 mm
KX250 -15mm
Dc5J
/J
>40
SUPPLEMENT - 1993 MODEL 15-13
Exhaust Valve (KIPS)
Removal
The KX250-J2 main exhaust valve can be removed or installed with
the same procedure as that of the KX125-J1 / J2 .
• Remove:
Carburetor
Cylinder Head
• Remove the right cover al the cylinder with the shaft lever mounted
on it (see Right Engine Cover) .
• Remove the cylinder (see Cylinder Removal),
. Tum the cvlinder up sid e down .
• Remove the plug [AJ and the gasket [ 8] at the left side of the cylinder.
• Pull out the operating rod [AJ as far as it goes .
• Remove the operat ing rod retaining screw [8] .
• Remove the exhaust valve in accordance with the following procedure.
o Remove the idle gear (8].
o lift up the exhaust valves [AJ , and remove the valve guides Ie] .
o lift up the exhaust valves, and pull out the operating rod [0] . Then
take out the exhaust valves.
• Remove the main exhaust valve in accordance with the following
procedure.
• Remove the main valve cover fA] , main valve rod cover [8] and
resonator cover [C] from the cylinder.
15-14 SUPPLEMENT - 1993 MOOEL
. Remove the main shaft nut (8) from the main shaft [AJ , and pull out
the main valve gear [C) .
Mlln
wit nut hall left-hand ttt,..d•.
• Unbolt the Allen bolt (8J from the main lever [A].
• Position the main exhaust valve full open, and pull out the main shaft
[AJ .
• Set the main exhaust valve full closed position. and remove the main
lever [8).
. Unscrew the two main exhaust valv9 retaining screws [AJ ,
. Take out the pin (C) from the main exhaust valve [B] .
• Pull out the main exhaust valve and main valve rod (0] from the
cylinder.
Installation Notes
. Scrape out any carbon and clean the valves with a high flash -point
solvent.
• Check the following or signs of damage:
Exhaust Valves and Valve Operated Rod
Oil Seal on Rod Seal Plug
C-rings
Gaskets
*If necessary, replace them with new ones .
• Be careful not to mile up the right and left exhaust valves. The left valve
has two gears [AJ .
SUPPLEMENT - 1993 MODEL 15-15
. Apply II 2 ·stroke engine oil to the following:
Exhaust Valve Upper and lower Journals
Exhaust Valve Pinions
Valve Fluids (inside)
Valve Operating Rod Journals
Valve Operating Rod R&ek
Main Exhaust Valve Parts
. Apply II high temperature grease to the oil seal tip on the operating rod.
AdjuSt the exhaust valve position in accordance with the following
procedure.
el nstall small main exhaust valve fA] on the valv8 holder [B] with pin
[C] .
e put the main exhaust valves [8] on the valve holder fA).
. Insert the main 8)(haust valv8 sets ( B] into their holes in the cylinder
[AI ·
e Jnstalithe retaining screws [C] securely.
• Check that the left and right main exhaust valves slide smoothly.
• Put the pin fA] in the main exhaust valve holes.
e Fit the main lever [B) to the pin.
15-16 SUPPLEMENT - 1993 MODEL
• Insert the main shah [A] in t he hole of the teft upper end at the cylinder
and through tho hole in the main lever [8] . Then put the main shah
into the cylinder holds.
• Fix the main lever [8] to the main shaft fA] with the Allen bott [e].
Torque - Allen Bolt: 3.9 N-m(O.4 kg-m, 35 In-Ib)
• Check that the main oKhaust valv85 slide smoothlv.
• Tum the cylinder upside down .
• Insert the exhaust valve in the cylinder. The left exhaust valve has two
gears on it.
e Engage the valv8 pinions with the rod rack [A] so that the punch
mar(s (Red Paint) (81 on the pinions are positioned toward the front
of the engine. The punch marks on the valve pinions should align with
the groovo (C] on the rod.
IIIOTE
o The marked tooth [AJ i$ identified by its shape also.
Punc h Mark
Paint)
SUPPLEMENT - 1993 MODEl 15-17
. Check the gasket on the left plug for signs of damage
1r Jf necessary, replace If with a new one.
• Install the plug on the left Side of the cylinder.
Torque - Operating Rod Lett Side Plug: 15 N-m (1 .5 kg-m, 11 " -Ib)
• Mount the valve gUIdes [B, DJ on the exhaust valves [A] and Idle gear
Ie].
o Before installing the right valv9 gUide, insen the Idle gear valve guide .
•
•
•
•
Turn the cylinder upside down .
Push the rod seal plug into the cylinder until the O-ring portion .
Pullout the operating rod as far as II goes .
Install the main valve rod [AJ in the cylinder so that grooved side tB]
faces outward
. Install the main valve rod cover [A] except gasket.
NOTE
o Instal! the main valve rod cover to prevent the mam valve rod pulling
out.
• Install the main valve gear [SJ and nul [e] on the main shaft [Aj. and
tighten the nul.
I""n ~,
ShaH
Iuo,
""'-h.... = N
Torque - Main Shaft Nut: 8.8 N·m(O.9 kg..m, 78 in-Ib)
15-18 SUPPLEMENT - 1993 MODEL
• Position the main 8)(haust valves full open .
• Remove t he main valve rod cover.
• With the main exhaust valves full open, check that the end of the main
valve rod and cylinder are aligned [AJ .
• Check the gasket on the left plug for signs of damage.
* If necessary replace it with a new one .
• Install the left plug on the cylind6f.
Torque - Oper.tlng Rod Left Side Plug: 15 Nom (1.5 kg-m, 11 .0 tt·lb)
e lnstall the main valve cover, main valve rod cover and main shaft cover
on the cylinder.
SUPPLEMENT - 1993 MODEL 15-19
Right Engine Cover
• Remove:
Transmission Oil (drain)
Coolant (drain)
Coolant Hose lower End
Kick Starter
Brake Pedal
Water Pump Cover
Impeller
• Remove the KIPS cover from the right side of t he cylinder .
• Remove the E clip {A]. washer { B] and wave washer {C] from the
operating rod .
• Remove the right cover bolts and take off the cover [D] with the
operating rod collar (E] fitted to the exhaust advancer shah boss [F].
Installation Notes
. There are two knock pins on the mating surfaces of the crankcase and
eight engine cover.
. In case the exhaust advancer assembly has been removed, install it and
turn the gear so as to level the gear drive pin (Al .
CAUTION
If the gear drive pin is not pollitioned level, h may faU out when
Installing 1M right engine cover .
• Install the eight engine cover using the kick shaft oil seal guide (Al to
protect the cover oil seal.
Specia l Tool - 011 Seal Guide, ¢l16: 57001 ·267 [Al
• Install the wave washer, washer and E-ciip securely.
• Tighten the right engine cover boilS.
15-20 SUPPLEMENT - 1993 MODEL
e lnstall the wave washer, washer and E-clip securely .
• Tighten the right engine cover bolts.
• Frt the groove of the valve operating rod collar [B] on the shah lever
boss [AJ and install the collar to the operating rod while turning the
shah lever nut counterclockwise with a wrench.
NOTE
o There
will be
8
gap between the right engine cover and crankcase
belore the right engine cover is tightened to the crankcase because
an inclined shaft lever pulls back the operating rod.
e Tighten the right engine cover bolts .
• Remove the plug screw [ AJ and take out the position pin ( 8 ).
• Pull the lever shaft Ie] out of t he right engine caver .
• Pull off the water pump shah (see Water Pump Shaft Removal in the
Cooling System chapter) .
For 10(125 model; do not remove the clutch release shaft unl.,.. It I,
absolutely necessary. If removed, you must replace the oll •• al with
• new one.
Exhaust Advancer Disassembly/Assembly Notes
. The exhaust advancer [AJ consists of the following parts.
A. Pins
B. Rod
C. Guide
D. D - ring
E. Steel Balls
F. Holder
G. Needle Bearing
H. Spacer
I. Collar
J . Spring
K. Washer
L Gear
SUPPLEMENT - 1993 MODEL 15-21
Assembly Notes
. Apply high temperature grease to the oil seal lips before inserting the
lever shaft .
• Apply molybdenum disulfide grease to the surface of the lever shaft,
and Insert the lever shaft into Ihe right engine cover hole.
e Torque the advancer lever mounting Allen bolts [OJ.
TOf'que - Advancer Lever Mounting Allen Bolts: 3.9 N-m(O.4 kg-m, 35
In·lb)
. Fit the advancer lever pin [AJ into Ihe groove [8J on the exhaust
advancer [CJ, and install the exhaust advancer in the engine cover
while turning the lever shah to Ihe right.
. Tighten the exhaust valve advancer shaft plug screw securely.
e The boss end of shaft lever must be positioned at 0 to 3.0 mm from the
right crankcase mating surface, tighten the shaft lever to t he governor
shaft with the following procedures.
• Place the right engine cover mating surface on a suitable plate that has
a thickness of 0 to 3,0 mm.
o Install the shaft levOf so that the boss end touches the ground [ E) .
o Tighten the shah lever nut wi th the above shah lever cond ition.
o Then the projecting amount of t he lever boss will become 0 to 3.0 mm
from the right engine cover mating surface.
15-22 SUPPLEMENT - 1993 MOOEL
SUPPLEMENT -1 993 MODEL 15-23
Suspension
Specifications
Standard
Item
Front Fork :
Air pressure
Rebound damping adjustment
Compression damping adjustment
Oil viscosity
Oil capacity
Oil level (fully compressed,
spring removed)
Fork spring free length
Rear Suspension (Uni -Trak) :
Rear Shock Absorber;
Rebound damping adjustment
Atmospheric pressure
12th click from the first click of the
fully clockwise position
91h (KX125), 12th(KX250) cl ick from the
f irst click of the fully clockwise position
KAY ABA 01 or SAE 5W
510 ± 4 mL
120 ± 2 mm (from top of outer tube)
Rear shock spring free length
Gas Reservoir;
Compression damping adjustment
Gas pressure
Tie- Rod . Rocker Arm:
Sleeve outside diameter:
Long
Short
Rocker Arm Mounting Bolt Runout
SpeelalTools -
--(Adjustable Range)
16 clicks
(Adjustable Range)
16 clicks
---
---
490mm
(Adjustable Range)
105 - 155 mm
480mm
'2 th (KX 125),1 0 Ih (KX250) click
from the first click of the fully
clockwise position
(Adjustable Range)
, 6 clicks
Spring preload ad justment
(Adjusting nut position from the
center of the upper mounting hole)
KX125,
KX250,
Service limit
Adjustable Range)
130.5 mm
132.5 mm
275mm
'2 th click
from the first click of the fully c lockwise
position
1000 k Pa (10 kg /em'. 142 psi)
21 .987 - 22.000 mrn
15.989 - 16.000 mm
under 0 .1 mm
Hoot Wrench: 57001-1101
Jack: 57001-1238
Fori( SprIng Holder: 57001-1286
Fori( Cylinder Holder: 57001-1287
Fork 011 Seal Drive" <Jl43: 5700'1-1340
Fork Piston Rod Puller, M12 x 1.25: 57001 -1289
Fork 011 Level GaLtg4l: 57001-1290
118-137 mm
118-137mm
270mm
Adjustable Range)
16 clicks
--21.85 mm
15.85 mm
0 .2mm

Accompanying Data:

Kawasaki KX125 Motorcycle PDF Service Manual (Updated: Saturday 21st of January 2023 04:56:36 AM)

Rating: 4.7 (rated by 63 users)

Compatible devices: NINJA ZX-10, ZX600A 1985, VULCAN 1700 VOYAGER, 2000 Ninja ZX-6R, KLX110L, KLX450R -, 1988 Ninja 250R, 1983 Z400F.

Recommended Documentation:

Text Version of Service Manual

(Ocr-Read Summary of Contents, UPD: 21 January 2023)

Recommended Instructions:

539201, NS-HZ313, 112-170A, TF964D

Additional Information:

Operating Impressions, Questions and Answers:

Table of Contents for Kawasaki KX125:

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Kawasaki service manuals contain enough detail and basic information to make them useful to the owner who desires to do his own basic maintenance and repair work. A basic knowledge of mechanics, the proper use of tools, and workshop procedures must be understood in order to carry out the work satisfactorily.

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