Honda WB20XT Bedienungsanleitung Seite 28

4. Check that the spark plug washer is in good condition, and thread
the spark plug in by hand to prevent cross-threading.
NOTE:
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—1/4 turn after the spark plug seats to compress the washer.
CAUTION:
The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and may cause engine damage.
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