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Servicing the Spark Plug (continued)
3. Clean the area around the base of the plug to keep dirt and debris out of the engine.
4. Remove the spark plug.
Checking the Spark Plug
Do not clean the spark plug(s). Always replace the spark plug(s) when it has a black
coating, worn electrodes, an oily film, or cracks.
If you see light brown or gray on the insulator, the engine is operating properly. A black
coating on the insulator usually means the air cleaner is dirty.
Set the gap to 0.75 mm (0.03 inch).
Maintenance: Engine Maintenance
G437139
IMPORTANT
G437150
Page 5–10
3464-637 A
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