5.
When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer. When reinstalling a used
spark plug, tighten 1/8 1/4 turn after the spark plug seats to
compress the washer.
The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and may damage the
engine.
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