Yamaha YP125R, Service Manual

Page: 151 / 498

ENGINE (YP250R)
3-24
2. Adjust:
• Throttle cable free play
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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
EWA12910
After adjusting the throttle cable free play,
start the engine and turn the handlebar to the
right and to the left to ensure that this does
not cause the engine idling speed to change.
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EAS20690
CHECKING THE SPARK PLUG
1. Disconnect:
• Spark plug cap “1”
2. Remove:
• Spark plug
NOTICE
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.
3. Check:
• Spark plug type
Incorrect
→
Change.
4. Check:
• Electrode “1”
Damage/wear
→
Replace the spark plug.
• Insulator “2”
Abnormal color
→
Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• Spark plug gap “a”
(with a wire thickness gauge)
Out of specification
→
Regap.
7. Install:
• Spark plug
Throttle cable free play
3.0–5.0 mm (0.12–0.20 in)
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
a
1
b
a
3 2
Manufacturer/model
NGK/DPR8EA-9
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
1