Spark Plug Service - Honda HS55 Owner's Manual

SPARK PLUG SERVICE
Recommended spark plug: BPR5ES (NGK), WIGEPR-U (ND)
To ensure proper engine operation, the spark plug must be properly gapped
and free of deposits.
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1. Remove the spark plug cap.
2. Use the wrench supplied in the tool kit to remove the spark plug.
3. Visually inspect the spark plug. Discard it if the insulator is cracked or
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chipped.
4. Measure the plug gap with a feeler gauge.
0.7-0.8 mm (0.027-0.031 in)
Correct as necessary by bending the side electrode.
5. Thread the plug in by hand to prevent cross-threading.
6. Tighten a new spark plug l/2 turn with the wrench to compress the
washer.
If you are reusing a plug, it should only take l/8- l/4 turn after the plug
seats.
CAUTION:
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The spark plug must be securely tightened. An improperly tightened plug
can become very hot and possibly damage the engine.
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Never use a spark plug with an improper heat range.
PLUG GAP
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