Checking The Spark Plugs - Yamaha VMX12 2001 Service Manual

ADJUSTING THE THROTTLE CABLE FREE PLAY/

CHECKING THE SPARK PLUGS

c. Tighten the locknut.
@
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.
@
EAS00059
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
1. Disconnect:
2. Remove:
@
Before removing the spark plugs, blow
away any dirt accumulated in the spark
plug wells with compressed air to prevent it
from falling into the cylinders.
@
3. Check:
4. Check:
5. Clean:
6. Measure:
3 - 15
WARNING
• spark plug cap
• spark plug
CAUTION:
• spark plug type
Incorrect → Change.
Spark plug type (manufacturer)
DPR8EA-9 (NGK)
X24EPR-U9 (DENSO)
• electrodes 1
Damage/wear → Replace the spark plug.
• insulator 2
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
• spark plug
(with a spark plug cleaner or wire brush)
• spark plug gap a
(with a wire gauge)
Out of specification → Regap.
Spark plug gap
0.8 ~ 0.9 mm
CHK
ADJ