Yamaha WOLVERINE R-SPEC YXE70WPAJ Owner's Manual page 144

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1. Spark plug wrench
Inspection
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
8
of the spark plug can indicate the condition of
the engine.
The ideal color of the porcelain insulator
around the center electrode is a medium-to-
light tan for a vehicle that is being ridden nor-
mally.
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 ex-
cessive, or if carbon and other deposits are
excessive, you should replace the spark plug
with the specified plug.
Specified spark plug:
NGK/CPR7EA-9
Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
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1. Spark plug gap
8-31