Honda EG3600CX Owner's Manual page 46

6. Make sure that the sealing 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
compress the washer.
If installing a new spark plug, tighten 1/2 turn after the spark plug seats
to compress the washer. If reinstalling a used spark plug, tighten 1/8 to
1/4 turn after the spark plug seats.
8. Reinstall the spark plug cap on the spark plug securely.
The spark plug must be securely tightened. An improperly
tightened plug can become very hot and possibly damage the
generator.
Never use a spark plug with an improper heat range.
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