If your spark plug shows any of the conditions besides Normal, the spark plug must be replaced.
Replacing a Spark Plug
See your Owner's Manual for the correct spark plug for your specific model. .
1. Disconnect the spark plug wire from the spark plug.
2. Remove the spark plug with a spark plug wrench.
**NOTE** When installing the new spark plug, ensure the
spark plug has the proper air gap spacing. Measure the spark plug's air gap with
a gap tool.
Gapping a Spark Plug
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Reinstalling the Spark Plug
Example: Install the spark plug with a 13/16" spark plug socket and ratchet wrench (tighten it to 180 inch pounds torque). If you do not have a torque wrench, tighten firmly. Consult your Owner's Manual for your specific spark plug's socket size.