Honda H3011H Owner's Manual page 53

6. Install the spark plug carefully, by hand, to avoid cross-threading.
7. After the spark plug is seated, tighten with a spark plug wrench to com-
press the washer.
IMPORTANT NoT'CE Loose spark plug can get hot enough to damage
the engine. Overtightening may damage the threads.
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.
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