Honda F300 Owner's Manual page 42

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SERVICING YOUR TILLER
If reinstalling a 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 plug
seats.
TORQUE: 12 N∙m
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.
7. Attach the spark plug cap.
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