2002 YAMAHA YZ85 wheel

5 - 2
CHAS
EC598100
REAR WHEEL
5PA50020
Extent of removal:
1 Rear wheel removal
2 Wheel bearing removal
3 Brake disc removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR WHEEL REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is no
danger of it falling over.
1 Nut (rear wheel axle) 1
2 Rear wheel axle 1
3 Drive chain puller 2
4 Rear wheel 1 Refer to “REMOVAL POINTS”.
5 Collar 2
6 Rear wheel sprocket 1
7 Oil seal 2
8 Circlip 1
9 Bearing 2 Refer to “REMOVAL POINTS”.
10Brake disc
1
2
31
3
FRONT WHEEL AND REAR WHEEL

5 - 3
CHAS
EC593000
REMOVAL POINTS
EC523101
Rear wheel
1. Remove:
lWheel 1
NOTE:
Push the wheel forward and remove the drive
chain 2.
5PA50030
EC513201
Wheel bearing (if necessary)
1. Remove:
lBearing 1
NOTE:
Remove the bearing using a general bearing
puller 2.
5PA50040
EC594000
INSPECTION
EC514100
Wheel
1. Measure:
lWheel runout
Out of limit ® Repair or replace.
2. Inspect:
lBearing
Rotate inner race with a finger.
Rough spot/seizure ® Replace.
NOTE:
Replace the bearings, oil seal and wheel collar
as a set.
Wheel runout limit:
Radial 1: 2.0 mm (0.08 in)
Lateral 2: 2.0 mm (0.08 in)
5PA50050
5PA50060
FRONT WHEEL AND REAR WHEEL

5 - 4
CHAS
EC514200
Wheel axle
1. Measure:
lWheel axle bends
Out of specification ® Replace.
Use the dial gauge 1.
NOTE:
The bending value is shown by one half of the
dial gauge reading.
WARNING
Do not attempt to straighten a bent axle.
Wheel axle bending limit:
0.5 mm (0.020 in)
5PA50070
Brake disc
1. Measure:
lBrake disc deflection
Use the dial gauge 1.
Out of specification ® Inspect wheel
runout.
If wheel runout is in good condition, replace
the brake disc.
2. Measure:
lBrake disc thickness a
Out of limit ® Replace.
Brake disc deflection limit:
0.15 mm (0.006 in)
Brake disc thickness:
3.0 mm (0.12 in)
: 2.5 mm (0.10 in)
5PA50080
FRONT WHEEL AND REAR WHEEL

5 - 5
CHAS
EC595000
ASSEMBLY AND INSTALLATION
Front wheel
1. Install:
lBearing (left) 1
lSpacer 2
lBearing (right) 3
lOil seal 4
NOTE:
lApply the lithium soap base grease on the
bearing and oil seal lip when installing.
lUse a socket that matches the outside diam-
eter of the race of the bearing.
lLeft side of bearing shall be installed first.
lInstall the oil seal with its manufacture’s
marks or numbers facing outward.
CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
2. Install:
lBrake disc 1
lBolt (brake disc) 2
5PA50090
5PA50100
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
3. Install:
lCollar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
5PA50110
4. Install:
lWheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.
5PA50120
FRONT WHEEL AND REAR WHEEL

5 - 6
CHAS
5. Install:
lWasher 1
lWheel axle 2
NOTE:
Apply the lithium soap base grease on the
wheel axle.
5PA50130
6. Install:
lWasher 1
lNut (wheel axle) 2
5PA50140
T R..70 Nm (7.0 m · kg, 50 ft · lb)
Rear wheel
1. Install:
lBearing (left) 1
lCirclip 2
lSpacer 3
lBearing (right) 4
lOil seal 5
NOTE:
lApply the lithium soap base grease on the
bearing and oil seal lip when installing.
lInstall the bearing with seal facing outward.
lUse a socket that matches the outside diam-
eter of the race of the bearing.
lLeft side of bearing shall be installed first.
lInstall the oil seal with its manufacture’s
marks or numbers facing outward.
CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
5PA50150
FRONT WHEEL AND REAR WHEEL

5 - 7
CHAS
2. Install:
lBrake disc 1
lBolt (brake disc) 2
NOTE:
Tighten the bolts (brake disc) in stage, using a
crisscross pattern.
5PA50160
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
3. Install:
lRear wheel sprocket 1
lBolt (rear wheel sprocket) 2
lWasher (rear wheel sprocket) 3
lNut (rear wheel sprocket) 4
NOTE:
Tighten the nuts (rear wheel sprocket) in
stage, using a crisscross pattern.5PA50170
T R..42 Nm (4.2 m · kg, 30 ft · lb)
4. Install:
lCollar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
5PA50180
5. Install:
lWheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.
5PA50190
6. Install:
lDrive chain 1
NOTE:
Push the wheel 2 forward and install the drive
chain.
5PA50200
FRONT WHEEL AND REAR WHEEL

5 - 8
CHAS
7. Install:
lRight drive chain puller 1
lLeft drive chain puller 2
lWasher 3
lWheel axle 4
NOTE:
lApply the lithium soap base grease on the
wheel axle.
lInsert the wheel axle from right side.5PA50210
8. Install:
lWasher 1
lNut (wheel axle) 2
NOTE:
Temporarily tighten the nut (wheel axle) at this
point.
5PA50220
9. Adjust:
lDrive chain slack a
Refer to “DRIVE CHAIN SLACK ADJUST-
MENT” section in the CHAPTER 3.
Drive chain slack:
35 ~ 45 mm (1.4 ~ 1.8 in)
5PA50230
10. Tighten:
lNut (wheel axle) 1
lLocknut 2
5PA50240
T R..110 Nm (11.0 m · kg, 80 ft · lb)
FRONT WHEEL AND REAR WHEEL

5 - 27
CHASFRONT FORK
EC550000
FRONT FORK
5PA50820
Extent of removal:
1 Front fork removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT FORK REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Front wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Front brake caliper Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Number plate
Handlebar Refer to “HANDLEBAR” section.
1 Protector 1
2 Brake hose holder 1
3 Pinch bolt (upper bracket) 1 Only loosening.
4 Cap bolt 1 Loosen when disassembling the front fork.
5 Pinch bolt (lower bracket) 2 Only loosening.
6 Front fork 1
1