Honda EM3500X Owner's Manual page 35

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 the spark plug is seated, tighten with a spark plug wrench to com-
press 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 1/8-
1/4 turn after the spark plug seats to compress the washer.
CAUTION:
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
i
recommended spark plugs or equivalent.
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