Honda WX10TA Owner's Manual page 41

7. After the spark plug seats, tighten with a spark plug wrench to
compress the 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 plug
seats.
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 top cover, and tighten the 5 mm hex bolt securely with a
hexagon wrench.
SERVICING YOUR PUMP
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