Honda HSS1380, Owner'S Manual

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The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and may damage the
engine.
Use only the recommended spark plugs or equivalent plugs. Spark
plugs which have an improper heat range may cause engine
damage.
SEALING WASHER
0.7 0.8 mm
(0.028 0.031 in)
PLUG GAP
SIDE ELECTRODE
INSULATOR
Measure the plug gap with a feeler gauge.
Correct as necessary by carefully bending the side electrode.
The gap should be:
STANDARD PLUG: BPR5ES (NGK)
W16EPR-U (DENSO)
0.7 0.8 mm (0.028 0.031 in)
After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
Make sure that the spark plug sealing washer is in good condition
and thread the spark plug in by hand to prevent cross-threading.
If installing a new spark plug, tighten 1/2 turn after the spark plug seats
to compress the washer. If reinstalling a used spark plug, tighten 1/8 to
1/4 turn after the spark plug seats.
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