Cowling C; Spark Plug - Yamaha TW125 Owner's Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
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1. Cowling C

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2. Screw
Cowling C
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To remove
Remove the cowling screw and
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pull outward on the areas shown.
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To install
Place in the original position and
install the screw.
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1. Spark plug wrench

Spark plug

EAU01145
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 insula-
tor around the center electrode is a
medium-to-light tan color for a
motorcycle that is being ridden
EAU01833
normally.
Do not attempt to diagnose such
problems yourself. Instead, take
the motorcycle to a Yamaha deal-
er. 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 excessive, or if carbon
and other deposits are excessive,
you should replace the spark plug
with the specified plug.
6-8
Specified spark plug:
DR8EA (NGK)