warning YAMAHA TTR125 2002 User Guide

3 - 20
INSP
ADJ
REAR BRAKE SHOE INSPECTION
1. Inspect:
lBrake shoe lining wear limit
BRAKE FLUID LEVEL INSPECTION
(TT-R125LW)
1. Place the brake master cylinder so that
its top is in a horizontal position.
2. Inspect:
lBrake fluid level
Fluid at lower level ® Fill up.
aLower level
WARNING
lUse only designated quality brake fluid to
avoid poor brake performance.
lRefill with same type and brand of brake
fluid; mixing fluids could result in poor
brake performance.
lBe sure that water or other contaminants
do not enter brake master cylinder when
refilling.
lClean up spilled fluid immediately to
avoid erosion of painted surfaces or plas-
tic parts. Brake shoe lining wear limit checking
steps:
lFully push down the brake pedal and hold
it in position.
lThen check the brake shoe wear indicator
1 is within the wear limit a.
Outside the limit ® Replace the brake
shoe.
Refer to “REAR WHEEL AND REAR BRAKE”
section in the CHAPTER 5.
Recommended brake fluid:
DOT #4
SPROCKETS INSPECTION
1. Inspect:
lSprocket teeth a
Excessive wear ® Replace.
NOTE:
Replace the drive, driven sprockets and drive
chain as a set.
REAR BRAKE SHOE INSPECTION/BRAKE FLUID LEVEL
INSPECTION (TT-R125LW)/SPROCKETS INSPECTION

3 - 26
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
3. Check:
lSteering smooth action
Turn the handlebar lock to lock.
Unsmooth action ® Adjust steering ring
nut.
4. Adjust:
lSteering ring nut
Steering ring nut adjustment steps:
lRemove the number plate and starter
knob.
lRemove the handlebar and upper bracket.
lRemove the special washer 1
lRemove the upper ring nut 2, and rubber
washer 3.
lLoosen the lower ring nut 4 using the
steering nut wrench 5.
Steering nut wrench:
YU-33975/90890-01403
lTighten the lower ring nut 6 using steer-
ing nut wrench 7 and turn the steering
right and left a few times.
Steering nut wrench:
YU-33975/90890-01403
T R..
Lower ring nut (initial tightening):
38 Nm (3.8 m • kg, 27 ft • lb)
lLoosen the lower ring nut one turn.
lRetighten the lower ring nut using the
steering nut wrench.
NOTE:
Set the torque wrench to the steering nut
wrench so that they form a right angle.
WARNING
Avoid over-tightening.

5 - 1
CHAS

FRONT WHEEL AND FRONT BRAKE (TT-R125)
EC500000
CHASSIS
FRONT WHEEL AND FRONT BRAKE (TT-R125)
Extent of removal:
1
Front 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 removal
FRONT WHEEL AND DRUM
BRAKE
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 Brake cable holder 1
2 Brake cable 1 Disconnect at the lever side, first.
3 Axle nut 1
4 Wheel axle 1
5 Front wheel 1
6 Collar set 1
7 Brake shoe plate assembly 1
8 Oil seal 1
9 Wheel bearing 2 Refer to “REMOVAL POINTS”.
10Spacer
1
2
3
1

5

5 - 3
CHAS

FRONT WHEEL AND FRONT BRAKE (TT-R125)
REMOVAL POINTS
EC513201
Wheel bearing (if necessary)
1. Remove:
l
Bearing
1

NOTE:

Remove the bearing using a general bearing
puller
2
.
INSPECTION
EC514100
Wheel
1. Measure:
l
Wheel runout
Out of limit
®
Repair/replace.
Wheel runout limit:
Radial
1
: 2.0 mm (0.08 in)
Lateral
2
: 2.0 mm (0.08 in)
2. Inspect:
l
Bearing
Rotate inner race with a finger.
Rough spot/seizure
®
Replace.
NOTE:

Replace the bearings, oil seal and wheel collar
as a set.
EC514200
Wheel axle
1. Measure:
l
Wheel 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 - 5
CHAS

FRONT WHEEL AND FRONT BRAKE (TT-R125)
ASSEMBLY AND INSTALLATION
Brake shoe plate assembly
1. Install:
l
Brake camshaft
1

NOTE:

Apply the lithium soap base grease on the
brake camshaft.
2. Check:
l
Brake camshaft operation
Unsmooth operation
®
Repair.
3. Install:
l
Wear 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:
l
Brake camshaft lever
1

NOTE:

Install the brake camshaft lever in relation to
the punch mark
a
as shown.
1
1a
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

5. Install:
l
Springs
1
lBrake shoes 2
NOTE:
Apply the lithium soap base grease on the
pivot pin.
WARNING
Do not apply grease to the brake shoe lin-
ings.
New

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 - 12
CHAS
FRONT BRAKE (TT-R125LW)
Extent of removal:1 Brake hose removal 2 Brake caliper removal
3 Brake master cylinder removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT BRAKE REMOVAL
Hold the machine by placing the
suitable stand under the engine.
Drain the brake fluid.
WARNING
Support the machine securely so there is nodanger of it falling over.
Refer to “REMOVAL POINTS”.
1 Brake hose holder 2
2 Union bolt 1
3 Brake hose 1
4 Joint 1
5 Brake caliper support bolt 1
6 Brake caliper 1 Refer to “REMOVAL POINTS”.
7 Brake lever 1
8 Brake master cylinder bracket 1
9Brake master cylinder
1
3
12
2
3
FRONT BRAKE (TT-R125LW)

5 - 13
CHASFRONT BRAKE (TT-R125LW)
BRAKE CALIPER AND BRAKE MASTER CYLINDER DISASSEMBLY
Extent of removal:1 Brake caliper disassembly2 Brake master cylinder disassembly
Extent of removal Order Part name Q’ty Remarks
Preparation for removalBRAKE CALIPER AND BRAKE
MASTER CYLINDER DISAS-
SEMBLY
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
1Brake pad 2
2Brake caliper bracket 1
3Brake caliper piston 2 Refer to “REMOVAL POINTS”.
4Brake caliper dust seal 2
Refer to “REMOVAL POINTS”.
5Brake caliper piston seal 2
6Pin boot 1
7Sleeve boot 1
8Brake master cylinder cap 1
9Diaphragm 1
0Brake master cylinder boot 1
ACirclip 1
BWasher 1
CBrake master cylinder kit 1
2
1

5 - 14
CHASFRONT BRAKE (TT-R125LW)
REMOVAL POINTS
Brake fluid
1. Remove:
lBrake master cylinder cap 1
NOTE:
Do not remove the diaphragm.
2. Connect the transparent hose 2 to the
bleed screw 1 and place a suitable con-
tainer under its end.
3. Loosen the bleed screw and drain the
brake fluid while pulling in the lever.
CAUTION:
lDo not reuse the drained brake fluid.
lBrake fluid may erode painted surfaces or
plastic parts. Always clean up spilled
fluid immediately.
Brake caliper
1. Remove:
lBrake caliper 1
NOTE:
Turn the brake caliper counterclockwise and
pull out it from the guide pin 2 on the brake
caliper bracket.
Brake caliper piston
1. Remove:
lBrake caliper piston
Use compressed air and proceed care-
fully.
WARNING
lCover piston with rag and use extreme
caution when expelling piston from cylin-
der.
lNever attempt to pry out piston.
Brake caliper piston removal steps:
lInsert a piece of rag into the brake caliper
to lock one brake caliper.
lCarefully force the piston out of the brake
caliper cylinder with compressed air.