Spark Plug - Yamaha DT125R Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
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1. Spark plug cap
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Spark plug

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Removal
1. Remove the spark plug cap.
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1. Spark plug wrench
EAU01833
2. Use the spark plug wrench in the
tool kit to remove the spark plug
as shown.
Inspection
1
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
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.
6-10
periodically remove
Specified spark plug:
BR9ES (NGK)
BR8ES (NGK) (CH, A only)
and