YAMAHA XTZ125 2003 Repair Manual

6-14
6-14
NOTE:
Before checking the throttle cable free play, the engine
idling speed should be adjusted.
Free play:
3 ~ 5 mm (0.12 ~ 0.19 in) Throttle cable adjustment
The throttle cable should have an specified free play in the
turning direction at the grip flange. If the free play is incorrect,

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NOTE:
Before checking the throttle cable free play, the engine
idling speed should be adjusted.
Free play:
3 ~ 5 mm (0.12 ~ 0.19 in) Throttle cable adjustment
The throttle cable should have an specified free play in the
turning direction at the grip flange. If the free play is incorrect,

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6-15
6-15Before installing the spark plug, measure the electrode gap
with a wire thickness gauge and adjust the gap to
specification as necessary.
Standard spark plug:
CR7HSA (NGK) and U22FSR-U (DENSO)


Spark plug gap:
0.7 mm ( 0.028 in) Spark plug inspection
The spark plug is an important engine component and is
easy to inspect. The condition of the spark plug can indicate
the condition of the engine.
The ideal color on the white porcelain insulator around the
center electrode is a medium to light tan color for a
motorcycle that is being ridden normally. Do not attempt to
diagnose any problems yourself. Instead, take the
motorcycle to a Yamaha dealer. You should periodically
remove and inspect the spark plug because heat and
deposits will cause the spark plug to slowly break down
and erode.
If electrode erosion becomes excessive, or if carbon and
other deposits are excessive, you should replace the spark
plug with the specified plug.NOTE:
If a torque wrench is not available when you are installing a
spark plug, a good estimate of the correct torque is 1/4 to
1/2 turn past finger tight. Have the spark plug torqued to
the correct value as soon as possible with a torque wrench.
When installing the plug, always clean the gasket surface
and use a new gasket. Wipe off any grime from the threads,
and torque the spark plug properly.
Spark plug torque:
12.5 N.m (1.25 Kgf.m, 9 lbf.ft)
Before installing the spark plug, measure the electrode gap
with a wire thickness gauge and adjust the gap to
specification as necessary.
Standard spark plug:
CR7HSA (NGK) and U22FSR-U (DENSO)


Spark plug gap:
0.7 mm ( 0.028 in) Spark plug inspection
The spark plug is an important engine component and is
easy to inspect. The condition of the spark plug can indicate
the condition of the engine.
The ideal color on the white porcelain insulator around the
center electrode is a medium to light tan color for a
motorcycle that is being ridden normally. Do not attempt to
diagnose any problems yourself. Instead, take the
motorcycle to a Yamaha dealer. You should periodically
remove and inspect the spark plug because heat and
deposits will cause the spark plug to slowly break down
and erode.
If electrode erosion becomes excessive, or if carbon and
other deposits are excessive, you should replace the spark
plug with the specified plug.NOTE:
If a torque wrench is not available when you are installing a
spark plug, a good estimate of the correct torque is 1/4 to
1/2 turn past finger tight. Have the spark plug torqued to
the correct value as soon as possible with a torque wrench.
When installing the plug, always clean the gasket surface
and use a new gasket. Wipe off any grime from the threads,
and torque the spark plug properly.
Spark plug torque:
12.5 N.m (1.25 Kgf.m, 9 lbf.ft)

6-16
6-16
Clutch adjustment

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The clutch lever free play should be adjusted to 10 ~ 15
mm (0.4 ~ 0.6 in) at the clutch lever end. If the free play is
incorrect, adjust as follows.
1. Loosen the locknut at the handlebar.
2. Turn the adjuster in (A) or out (B) until proper lever free
play is obtained.
3. Tighten the locknut.
4. If the free play is still incorrect, make an adjustment at
the crankcase side.
NOTE:
If proper adjustment cannot be obtained or the clutch does
not work correctly, ask a Yamaha dealer to inspect the
internal clutch mechanism.
Clutch adjustment

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The clutch lever free play should be adjusted to 10 ~ 15
mm (0.4 ~ 0.6 in) at the clutch lever end. If the free play is
incorrect, adjust as follows.
1. Loosen the locknut at the handlebar.
2. Turn the adjuster in (A) or out (B) until proper lever free
play is obtained.
3. Tighten the locknut.
4. If the free play is still incorrect, make an adjustment at
the crankcase side.
NOTE:
If proper adjustment cannot be obtained or the clutch does
not work correctly, ask a Yamaha dealer to inspect the
internal clutch mechanism.

6-17
6-17
Front brake adjustment
A soft or spongy feeling in the brake lever can indicate the
presence of air in the brake system. This air must be
removed by bleeding the brake system before the
motorcycle is operated. Air in the brake system will
considerably reduce braking performance and could result
in a loss of control and possibly an accident. Inspect and if
necessary, bleed the brake system.

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Front brake adjustment
A soft or spongy feeling in the brake lever can indicate the
presence of air in the brake system. This air must be
removed by bleeding the brake system before the
motorcycle is operated. Air in the brake system will
considerably reduce braking performance and could result
in a loss of control and possibly an accident. Inspect and if
necessary, bleed the brake system.

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6-18
6-18
For brake pedal adjustment, be sure to proceed as
follows (it is advisable to have a Yamaha dealer make
this adjustment.)
1. Pedal height.
a. Loosen the locknut.
b. By turning the adjuster clockwise or counterclockwise
adjust the brake pedal position so that its top end is
approximatelly 2 mm (0.08 in) below the footrest top
end.
c. Tighten the locknut.
Rear brake adjustment

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WARNING:
For brake pedal adjustment, be sure to proceed as
follows (it is advisable to have a Yamaha dealer make
this adjustment.)
1. Pedal height.
a. Loosen the locknut.
b. By turning the adjuster clockwise or counterclockwise
adjust the brake pedal position so that its top end is
approximatelly 2 mm (0.08 in) below the footrest top
end.
c. Tighten the locknut.
Rear brake adjustment

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WARNING:

6-19
6-19ADVERTENCIA
After adjusting the pedal height adjust brake pedal free
play.
2. Freeplay.
The rear brake pedal free play should be adjusted to
20 ~ 30 mm (0.8 ~ 1.2 in) at the brake pedal end. Turn
the adjuster on the brake rod clockwise to reduce play
or counterclockwise to increase play.
ADVERTENCIA
Brake pedal free play should be checked whenever the
chain is adjusted or the rear wheel is removed and then
reinstalled.
If it is impossible to make proper adjustment, consult
a Yamaha dealer.
Check the operation of the brake light after adjusting
the rear brake.

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$(*-.*)*+-
,
WARNING:
WARNING:
ADVERTENCIA
After adjusting the pedal height adjust brake pedal free
play.
2. Freeplay.
The rear brake pedal free play should be adjusted to
20 ~ 30 mm (0.8 ~ 1.2 in) at the brake pedal end. Turn
the adjuster on the brake rod clockwise to reduce play
or counterclockwise to increase play.
ADVERTENCIA
Brake pedal free play should be checked whenever the
chain is adjusted or the rear wheel is removed and then
reinstalled.
If it is impossible to make proper adjustment, consult
a Yamaha dealer.
Check the operation of the brake light after adjusting
the rear brake.

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$(*-.*)*+-
,
WARNING:
WARNING:

6-20
6-20
Brake light switch adjustment
The rear brake light switch is activated by the brake pedal
and is properly adjusted when the brake light comes on
just before braking takes effect. To adjust the rear brake
light switch, hold the switchbody so it does not rotate while
turning the adjusting nut.
Turn the adjusting nut in direction
to make the brake
light come on earlier.
Turn the adjusting nut in direction  to make the brake
light come on later.Checking the front brake pads and rear brake shoes
A wear indicator is provided on each brake. This indicator
allows checking of brake pad/shoe wear without
disassembling the brake.

 
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Brake light switch adjustment
The rear brake light switch is activated by the brake pedal
and is properly adjusted when the brake light comes on
just before braking takes effect. To adjust the rear brake
light switch, hold the switchbody so it does not rotate while
turning the adjusting nut.
Turn the adjusting nut in direction
to make the brake
light come on earlier.
Turn the adjusting nut in direction  to make the brake
light come on later.Checking the front brake pads and rear brake shoes
A wear indicator is provided on each brake. This indicator
allows checking of brake pad/shoe wear without
disassembling the brake.

 
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6-21
6-21
Apply the brake and inspect the wear indicator. If the
indicator reaches the wear limit line, ask a Yamaha dealer
to replace the shoes.

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  /

Rear BrakeApply the brake and inspect the wear indicator. If the wear
indicator is almost in contact with the disc plate, ask a
Yamaha dealer to replace the pads.
Front Brake

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/
 
Apply the brake and inspect the wear indicator. If the
indicator reaches the wear limit line, ask a Yamaha dealer
to replace the shoes.

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  /

Rear BrakeApply the brake and inspect the wear indicator. If the wear
indicator is almost in contact with the disc plate, ask a
Yamaha dealer to replace the pads.
Front Brake

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/
 

6-22
6-22
Inspecting the brake fluid levelInsufficient brake fluid may let air enter the brake system,
possibly causing the brakes to become ineffective. Before
riding, check that the brake fluid is above the lower level
and replenish when necessary. Observe these precautions:

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1. When checking the fluid level, make sure the top of the
master cylinder is level by turning the handlebars.
2. Use only the designated quality brake fluid. Otherwise,
the rubber seals may deteriorate, causing leakage and
poor brake performance.
Recommended brake fluid:
DOT #4
NOTE:
If DOT #4 is not available, #3 can be used.
Inspecting the brake fluid levelInsufficient brake fluid may let air enter the brake system,
possibly causing the brakes to become ineffective. Before
riding, check that the brake fluid is above the lower level
and replenish when necessary. Observe these precautions:

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1. When checking the fluid level, make sure the top of the
master cylinder is level by turning the handlebars.
2. Use only the designated quality brake fluid. Otherwise,
the rubber seals may deteriorate, causing leakage and
poor brake performance.
Recommended brake fluid:
DOT #4
NOTE:
If DOT #4 is not available, #3 can be used.

6-23
6-23 3. Refill with the same type of brake fluid. Mixing fluids
may result in a harmful reaction and lead to poor brake
performance.
4. Be careful that water does not enter the master cylinder
when refilling. Water will significantly lower the boiling
point of the fluid and may result in vapor lock.
5. Brake fluid may deteriorate painted surfaces or plastic
parts. Always clean up spilled fluid immediately.
6. Have a Yamaha dealer check the cause if the brake
fluid level goes down.1. Complete fluid replacement should be done only by
trained service personnel.
2. Have a Yamaha dealer replace the following
components during periodic maintenance or when they
are damaged or leaking.
a. Replace all rubber seals every two years.
b. Replace all hoses every four years. Brake fluid replacement
3. Refill with the same type of brake fluid. Mixing fluids
may result in a harmful reaction and lead to poor brake
performance.
4. Be careful that water does not enter the master cylinder
when refilling. Water will significantly lower the boiling
point of the fluid and may result in vapor lock.
5. Brake fluid may deteriorate painted surfaces or plastic
parts. Always clean up spilled fluid immediately.
6. Have a Yamaha dealer check the cause if the brake
fluid level goes down.1. Complete fluid replacement should be done only by
trained service personnel.
2. Have a Yamaha dealer replace the following
components during periodic maintenance or when they
are damaged or leaking.
a. Replace all rubber seals every two years.
b. Replace all hoses every four years. Brake fluid replacement