HONDA EP2500CX - Manual (Page 42)

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SERVICING YOUR GENERATOR
Make sure that the spark plug sealing washer is in good condition,
and thread the spark plug in by hand to prevent cross-threading.
After the spark plug seats, tighten with a 13/16-inch spark plug
wrench to compress the washer.
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.
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.
Attach the spark plug cap.
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