Honda Marine BF2.3D Owner's Manual page 50

SERVICING YOUR OUTBOARD MOTOR
6. Install the spark plug carefully, by
hand, to avoid cross-threading.
7. After the spark plug seats, tighten
with a spark plug wrench supplied
in the tool kit to compress the
sealing washer.
If reinstalling the used spark plug,
tighten 1/8 1/4 turn after the
spark plug seats.
If installing a new spark plug,
tighten 1/2 turn after the spark
plugs seat.
A loose spark plug can overheat
and damage the engine.
Overtightening the spark plug can
damage the threads in the cylinder
head.
8. Attach the spark plug cap.
9. Install the engine cover.
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