Common Faults and Troubleshooting
Service and Maintenance of the Spark Plug
Remove the spark plug from the engine. If the color of the insulator
skirt of the spark plug is brown it indicates that the carburetor is
adjusted properly. Any signs of buildup on the plug should be noted
as this could be a sign of an incorrect carburetor adjustment.
Cleaning the Spark Plug
Inspect the spark plug for carbon buildup. If there are noticeable
deposits or wear on the spark plug, replace.
It is normal for the
spark plug to be
light brown. This
indicates a proper
air fuel mixture.
Correct spark plug gap helps fuel
economy and performance.
Incorrectly gapped spark plugs can
lead to hard starting and poor
performance. Always replace the
spark plug with the original NGK
replacement.
When removing and
tightening the spark plug, be
sure to use the correctly
sized socket. Improper
removal can result in spark
plug damage that can result
in costly repairs.
Check the electrode
gap of the spark plug
with a gauge and
adjust the gap to 0.025
inches.
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