Honda Automobiles BF2D Owner's Manual page 52

SERVUCING YOUR WONDA OUUBOARD MOTOR
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 compress
the washer.
If installing a new spark plug, tighten l/2 turn after the spark plug seats to
compress the washers. If reinstalling a used spark plug, tighten l/8-1/4
turn after the spark plug seats to compress the washer.
8. Install the engine cover.
1 NOTICE-]
l
The spark plug must be securely tightened. An improperly tightened plug
can become very hot and may cause engine damage.
l
Use only the recommended spark plug or equivalent. A spark plug which
has an improper heat range may cause engine damage.