6.Check that the spark plug washer is in good condition, and thread the
spark plug in by hand to prevent cross-threading.
7.After each spark plug is seated, tighten with a spark plug wrench to
compress the washer.
NOTE:
If installing a new spark plug, tighten l/2 turn after the spark plug seats to
compress the washer. If reinstalling a used spark plug, tighten l/8 - l/4
turn after the spark plug seats to compress the washer.
l The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and could damage the engine.
l Never use spark plugs which have an improper heat range. Use only
the recommended spark plugs or equivalent.
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