Checking The Spark Plug - Yamaha YFM25RX Owner's Manual

EWB00010
WARNING
Indicates a potential hazard that could result in
serious injury or death.
EBU23211

Checking the spark plug

The spark plug is an important engine component,
which is easy to check. Since heat and deposits
will cause any spark plug to slowly erode, the spark
plug should be removed and checked in accor-
dance with the periodic maintenance and lubrica-
tion chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
To remove the spark plug
1. Remove the spark plug cap.
1. Spark plug cap
2. Remove the spark plug as shown, with the
spark plug wrench included in the owner's tool
kit.
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