Owner's Manual

6-10
PERIODIC MAINTENANCE AND MINOR REPAIR
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EAU01833
Spark plug
Removal
1. Remove the spark plug cap.
2. Use the spark plug wrench in the
tool kit to remove the spark plug
as shown.
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 insulator
around the center electrode is a
medium-to-light tan color for a motor-
cycle that is being ridden normally.
Do not attempt to diagnose such
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 any spark
plug to slowly break down and erode.
If electrode erosion becomes exces-
sive, or if carbon and other deposits
are excessive, you should replace
the spark plug with the specified plug.
1. Spark plug cap
Specified spark plug:
BR9ES (NGK)
BR8ES (NGK) (CH, A only)
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1. Spark plug wrench
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