Yamaha YZF-R125, Service Manual

Page: 80 / 356

ENGINE
3-7
c. Tighten the locknut.
NOTE:
If the specified throttle cable free play cannot be
obtained on the throttle body end of the cable,
use the adjusting nut on the handlebar end.
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Handlebar end
a. Slide back the rubber cover “1”.
b. Loosen the locknut “2”.
c. Turn the adjusting nut “3” in direction “a” or “b”
until the specified throttle cable free play is
obtained.
d. Tighten the locknut.
e. Slide the rubber cover to its original position.
WARNING
EWA12930
After adjusting the throttle cable free play,
start the engine and turn the handlebar to the
right or left to ensure that this does not
cause the engine idling speed to change.
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4. Install:
• Right side panel
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20690
CHECKING THE SPARK PLUG
1. Remove:
• Right side cover
Refer to “GENERAL CHASSIS” on page 4-1.
2. Disconnect:
• Spark plug cap
3. Remove:
• Spark plug
CAUTION:
ECA13330
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
4. Check:
• Spark plug type
Incorrect
→
Change.
5. Check:
• Electrode “1”
Damage/wear
→
Replace the spark plug.
• Insulator “2”
Abnormal color
→
Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
7. Measure:
• Spark plug gap “a”
(with a wire thickness gauge)
Out of specification
→
Regap.
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
T
R
.
.
Throttle cable locknut
7 Nm (0.7 m·kg, 5.1 ft·lb)
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
2
1
b
a
2
1
3
a
b
Manufacturer/model
NGK/CR8E
Spark plug gap
0.7–0.8 mm (0.028–0.031 in)
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