warning YAMAHA TTR125 2003 Owner's Guide

5 - 22
CHAS
Brake fluid
1. Fill:
Brake fluid
Until the fluid level reaches “LOWER”
level line a.
WARNING
Use only the designated quality brake
fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.
Refill with the same type of brake fluid;
mixing fluids may result in a harmful chem-
ical reaction and lead to poor performance.
Be careful that water does not enter the
brake master cylinder when refilling.
Water will significantly lower the boiling
point of the fluid and may result in vapor
lock.
CAUTION:
Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
Recommended brake fluid:
DOT #4
2. Air bleed:
Brake system
Refer to “BRAKE SYSTEM AIR
BLEEDING” section in the CHAPTER
3.
3. Inspect:
Brake fluid level
Fluid at lower level → Fill up.
Refer to “BRAKE FLUID LEVEL
INSPECTION” section in the CHAP-
TER 3.
FRONT BRAKE (TT-R125LWE)

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 - 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:
Brake shoe lining surface
Glazed areas → Polish.
Use coarse sand paper.
NOTE:
After polishing, wipe the polished particles with
a cloth.
2. Measure:
Brake 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:
Brake drum inside diameter a
Out of specification → Replace.
Brake drum inside diameter:
Standard
110 mm
(4.33 in)111 mm
(4.37 in)

5 - 29
CHASREAR WHEEL AND REAR BRAKE
5. Install:
Springs 1
Brake shoes 2
On brake shoe plate 3
NOTE:
Apply the lithium soap base grease on the
pivot pin.
When installing the springs and brake shoes,
take care not to damage the springs.
When replacing the brake shoes, replace the
springs as a set.
WARNING
Do not apply grease to the brake shoe lin-
ings.
New
Rear wheel
1. Install:
Wheel bearing 1
Spacer 2
Wheel bearing 3
Oil seal 4
NOTE:
Apply the lithium soap base grease on the oil
seal lip when installing.
Install the bearing with seal facing outward.
Use a socket that matches the outside diam-
eter of the race of the bearing.
Right side of bearing shall be installed first.
Install 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 - 32
CHAS

FRONT FORK
EC550000
FRONT FORK
Å
TT-R125E
ı
TT-R125LWE
Extent of removal:
1
Front fork removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removal
FRONT FORK 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.
Front wheel Refer to “FRONT WHEEL AND FRONT
BRAKE” section.
(Refer to “FRONT WHEEL” section for
the TT-R125LWE.)
Handlebar Refer to “HANDLEBAR” section.
AB
1 Cap 1–
2 Pinch bolt (upper bracket) 1 1 Only loosening.
3 Cap bolt 1 1Loosen when disassembling the front fork.
4 Pinch bolt (lower bracket) 1 1 Only loosening.
5Front fork
11
1

5 - 36
CHASFRONT FORK
Inner tube
1. Inspect:
Inner tube surface a
Score marks → Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece → Replace.
Inner tube 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 inner
tube as this may dangerously weaken the
tube.
2. Inspect:
Piston metal 1
Wear/damage → Replace.
Inner tube bending limit:
0.2 mm (0.008 in)
Outer tube
1. Inspect:
Outer tube 1
Slide metal 2
Score marks/wear/damage → Replace
outer tube assembly.
Cap bolt
1. Inspect:
Cap bolt 1
O-ring 2
Wear/damage → Replace.

5 - 44
CHAS
REMOVAL POINTS
Brake master cylinder (TT-R125LWE)
1. Remove:
Brake master cylinder bracket 1
Brake master cylinder 2
CAUTION:
Do not let the brake master cylinder hang
on the brake hose.
Keep the brake master cylinder cap side
horizontal to prevent air from coming in.
U P1 2
Handlebar grip
1. Remove:
Handlebar grip 1
NOTE:
Blow in air between the handlebar or tube
guide and the grip. Then remove the grip
which has become loose.
INSPECTION
Handlebar
1. Inspect:
Handlebar 1
Bends/cracks/damage → Replace.
WARNING
Do not attempt to straighten a bent handle-
bar as this may dangerously weaken the
handlebar.
HANDLEBAR

5 - 46
CHAS
2. Install:
Handlebar grip (left) 1
Apply the adhesive to the handlebar 2.
NOTE:
Before applying the adhesive, wipe off grease
or oil on the handlebar surface a with a lac-
quer thinner.
3. Install:
TT-R125E
Collar 1
4. Install:
Throttle grip assembly 1
Grip cap (upper) 2
Throttle cable 3
On tube guide 4.
NOTE:
Apply the lithium soap base grease on the
throttle cable end and tube guide cable wind-
ing portion.
5. Install:
Throttle cable cap 1
Screw (throttle cable cap) 2
Grip cap (lower) 3
Screw (grip cap) 4
Cover (grip cap) 5
WARNING
After tightening the screws, check that the
throttle grip 6 moves smoothly. If it does
not, retighten the bolts for adjustment.
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
T R..4 Nm (0.4 m · kg, 2.9 ft · lb)
HANDLEBAR

5 - 48
CHASSTEERING
EC560000
STEERING
Extent of removal:1 Lower bracket removal2 Bearing removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalSTEERING 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 forks Refer to “FRONT FORK” section.
Handlebar Refer to “HANDLEBAR” section.
Front fender
1 Steering stem nut 1
2 Upper bracket 1
3 Special washer 1
4 Upper ring nut 1
Use special tool.
Refer to “REMOVAL POINTS”. 5 Rubber washer 1
6 Lower ring nut 1
7 Lower bracket 1
8Bearing cover
1
21

5 - 50
CHAS
EC563000
REMOVAL POINTS
EC563202
Ring nut
1. Remove:
Ring nut 1
Use the steering nut wrench 2.
WARNING
Support the steering shaft so that it may
not fall down.
Steering nut wrench:
YU-33975/90890-01403
Bearing race
1. Remove:
Bearing race 1
Remove the bearing race using long
rod 2 and the hammer.
EC563300
Bearing (lower)
1. Remove:
Bearing (lower) 1
Use the floor chisel 2.
CAUTION:
Take care not to damage the steering shaft
thread.
EC564000
INSPECTION
Steering stem
1. Inspect:
Steering stem 1
Bend/damage → Replace.
STEERING