wheel YAMAHA TTR125 2002 Owner's Guide

5 - 7
CHASFRONT WHEEL AND FRONT BRAKE (TT-R125)
5. Install:
lAxle nut 1
T R..45 Nm (4.5 m · kg, 32 ft · lb)
6. Install:
lBrake cable
NOTE:
Brake camshaft lever side of brake cable shall
be installed first.
7. Install:
lBrake cable holder 1
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
8. Adjust:
lBrake lever free play
Refer to “FRONT BRAKE ADJUST-
MENT” section in the CHAPTER 3.

5 - 8
CHAS
FRONT WHEEL (TT-R125LW)
Extent of removal:1 Front wheel removal2 Wheel bearing removal
3 Brake disc removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT WHEEL 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.
1 Axle nut 1
2 Washer 1
3 Wheel axle 1
4 Front wheel 1
5 Collar 2
6 Oil seal 2
7 Wheel bearing 2 Refer to “REMOVAL POINTS”.
8 Spacer 1
9Brake disk
1
2
31
3
FRONT WHEEL (TT-R125LW)

5 - 9
CHASFRONT WHEEL (TT-R125LW)
REMOVAL POINTS
EC513201
Wheel bearing (if necessary)
1. Remove:
lBearing 1
NOTE:
Remove the bearing using a general bearing
puller 2.
INSPECTION
EC514100
Wheel
1. Measure:
lWheel runout
Out of limit ® Repair/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)
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)

5 - 10
CHASFRONT WHEEL (TT-R125LW)
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.
Disc deflection limit:
0.15 mm (0.006 in)
Disc wear limit:
Standard
3.0 mm
(0.12 in)2.5 mm
(0.10 in)
ASSEMBLY AND INSTALLATION
Front wheel
1. Install:
lWheel bearing 1
lSpacer 2
lWheel bearing 3
lOil seal 4
NOTE:
lApply the lithium soap base grease on the
wheel bearing and oil seal lip when installing.
lInstall the wheel bearing so that the enclosed
side is facing outward.
lUse a socket that matches the outside diam-
eter of the race of the bearing.
lLeft side of wheel 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.
New

5 - 11
CHASFRONT WHEEL (TT-R125LW)
2. Install:
lBrake disc 1
lBolt (brake disc) 2
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)LT
3. Install:
lCollar 1
NOTE:
lApply the lithium soap base grease on the oil
seal lips.
lInstall the longer collar on the brake disc 2
side.
4. Install:
lFront wheel
NOTE:
Install the brake disc 1 between the brake
pads 2 correctly.
5. Install:
lWheel axle 1
6. Install:
lWasher 1
lAxle nut 2
T R..45 Nm (4.5 m · kg, 32 ft · lb)

5 - 24
CHAS
REAR WHEEL AND REAR BRAKE
Extent of removal:1 Rear wheel removal 2 Wheel bearing removal
3 Brake shoe plate assembly removal and disassembly
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR WHEEL AND DRUM
BRAKE
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
1 Brake rod 1
2 Axle nut 1
3 Drive chain puller (right) 1
4 Wheel axle 1
5 Drive chain puller (left) 1
6 Drive chain 1
7 Rear wheel 1 Refer to “REMOVAL POINTS”.
8 Collar (right) 1
9 Brake shoe plate assembly 1
10Collar (left)
1
231
REAR WHEEL AND REAR BRAKE

5 - 25
CHAS
Extent of removal Order Part name Q’ty Remarks
11 Nut (wheel sprocket) 4
12 Wheel sprocket 1
13 Oil seal 1
14 Wheel bearing 2 Refer to “REMOVAL POINTS”.
15 Spacer 1
16 Brake shoe 2
17 Spring 2
18 Brake camshaft lever 1
19 Wear indicator plate 1
20 Brake camshaft 1
21 Brake shoe plate 1
3
2
REAR WHEEL AND REAR BRAKE

5 - 26
CHASREAR WHEEL AND REAR BRAKE
REMOVAL POINTS
EC523101
Rear wheel
1. Remove:
lWheel 1
NOTE:
Push the wheel forward and remove the drive
chain 2.
EC513201
Wheel bearing (if necessary)
1. Remove:
lBearing 1
NOTE:
Remove the bearing using a general bearing
puller 2.
INSPECTION
EC514100
Wheel
1. Measure:
lWheel runout
Out of limit ® Repair/replace.
2. Inspect:
lBearing
Rotate inner race with a finger.
Rough spot/seizure ® Replace.
NOTE:
Replace the bearings, oil seal and wheel collar
(wheel sprocket side) as a set.
Wheel runout limit:
Radial 1: 2.0 mm (0.08 in)
Lateral 2: 2.0 mm (0.08 in)
EC514200
Wheel axle
1. Measure:
lWheel axle bends
Out of specification ® Replace.
Use the dial gauge 1.
Wheel axle bending limit:
0.5 mm (0.020 in)

5 - 27
CHASREAR WHEEL AND REAR BRAKE
NOTE:
The bending value is shown by one half of the
dial gauge reading.
WARNING
Do not attempt to straighten a bent axle.
Drum brake
1. Inspect:
lBrake shoe lining surface
Glazed areas ® Polish.
Use coarse sand paper.
NOTE:
After polishing, wipe the polished particles with
a cloth.
2. Measure:
lBrake shoe lining thickness a
Out of specification ® Replace.
NOTE:
Replace the brake shoes and springs as a set
if either is worn to the limit.
Brake shoe lining thickness:
Standard
4.0 mm
(0.16 in)2.0 mm
(0.08 in)
3. Measure:
lBrake drum inside diameter a
Out of specification ® Replace.
Brake drum inside diameter:
Standard
110 mm
(4.33 in)111 mm
(4.37 in)

5 - 28
CHASREAR WHEEL AND REAR BRAKE
4. Inspect:
lBrake drum inner surface.
Oil/scratches ® Remove.
OilUse a rag soaked in lac-
quer thinner or a solvent.
ScratchesUse a emery cloth (lightly
and evenly polishing).
ASSEMBLY AND INSTALLATION
Brake shoe plate assembly
1. Install:
lBrake camshaft 1
NOTE:
Apply the lithium soap base grease on the
brake camshaft.
2. Check:
lBrake camshaft operation
Unsmooth operation ® Repair.
3. Install:
lWear indicator plate 1
NOTE:
When installing the wear indicator plate to the
brake camshaft align the projection a on the
wear indicator plate with the slots b on the
brake camshaft.
4. Install:
lBrake camshaft lever 1
NOTE:
Install the brake camshaft lever in relation to
the punch mark a as shown.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)