2005 YAMAHA XTZ125 Owners Manual

6-10
6-10
The air filter should be cleaned at the specified intervals.
It should be cleaned more frequently if you are riding in
unusually wet or dusty areas.
1. Remove the right side cover.(pag. 3-13)
2. Remove the air filter case cover by removing the bolts.
3. Remove the air filter from the case.Air filter



   

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The air filter should be cleaned at the specified intervals.
It should be cleaned more frequently if you are riding in
unusually wet or dusty areas.
1. Remove the right side cover.(pag. 3-13)
2. Remove the air filter case cover by removing the bolts.
3. Remove the air filter from the case.Air filter



   

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6-11
6-11
CAUTION:
Make sure the element is properly seated in the air filter
case.
CAUTION:
The engine should never be run without the air filter
element installed; excessive piston and/or cylinder wear
may result.
Recommended oil:
Engine oil 20W50 4. Remove the air filter element from the guide and clean
it with solvent. After cleaning, remove the remaining
solvent by squeezing the air filter
5. Apply recommended oil to the entire surface of the filter
and squeeze out the excess oil. The air filter should be
wet but not dripping.
6. Reinstall the air filter in its case.
7. Install the air filter case cover and the right side cover.
CAUTION:
Make sure the element is properly seated in the air filter
case.
CAUTION:
The engine should never be run without the air filter
element installed; excessive piston and/or cylinder wear
may result.
Recommended oil:
Engine oil 20W50 4. Remove the air filter element from the guide and clean
it with solvent. After cleaning, remove the remaining
solvent by squeezing the air filter
5. Apply recommended oil to the entire surface of the filter
and squeeze out the excess oil. The air filter should be
wet but not dripping.
6. Reinstall the air filter in its case.
7. Install the air filter case cover and the right side cover.

6-12
6-12Valve clearance adjustment
The correct valve clearance changes with use, resulting in
improper fuel/air supply or engine noise. To prevent this,
valve clearance must be adjusted regularly. This adjustment,
however, should be left to a professional Yamaha service
technician. Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting should
be left to a Yamaha dealer who has the professional
knowledge, specialized data, and equipment to do so
properly. However, the following may be serviced by the
owner as part of routine maintenance.
CAUTION:
The carburetor was set at Yamaha factory after many
tests. If the settings are changed, poor engine
performance and damage may result.
Valve clearance adjustment
The correct valve clearance changes with use, resulting in
improper fuel/air supply or engine noise. To prevent this,
valve clearance must be adjusted regularly. This adjustment,
however, should be left to a professional Yamaha service
technician. Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting should
be left to a Yamaha dealer who has the professional
knowledge, specialized data, and equipment to do so
properly. However, the following may be serviced by the
owner as part of routine maintenance.
CAUTION:
The carburetor was set at Yamaha factory after many
tests. If the settings are changed, poor engine
performance and damage may result.

6-13
6-13NOTE:
A diagnostic tachometer must be used for this
procedure.
Standard idle speed:
1,300 ~ 1,500 r/minNOTE:
If the specified idle speed cannot be obtained by performing
the above adjustment, consult a Yamaha dealer.

 
 
"
Idle speed adjustment
1. Attach the tachometer. Start the engine and warm it up
for a few minutes (normally, 1 or 2 minutes) at
approximately 1,000 to 2,000 r/min. Occasionally rev
the engine to 4,000 to 5,000 r/min. The engine is warm
when it quickly responds to the throttle.
2. Set the idle to the specified engine speed by adjusting
the throttle stop screw; turn the screw in to increase
engine speed and out to decrease engine speed.
NOTE:
A diagnostic tachometer must be used for this
procedure.
Standard idle speed:
1,300 ~ 1,500 r/minNOTE:
If the specified idle speed cannot be obtained by performing
the above adjustment, consult a Yamaha dealer.

 
 
"
Idle speed adjustment
1. Attach the tachometer. Start the engine and warm it up
for a few minutes (normally, 1 or 2 minutes) at
approximately 1,000 to 2,000 r/min. Occasionally rev
the engine to 4,000 to 5,000 r/min. The engine is warm
when it quickly responds to the throttle.
2. Set the idle to the specified engine speed by adjusting
the throttle stop screw; turn the screw in to increase
engine speed and out to decrease engine speed.

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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