Honda HS621 Owner's Manual page 28

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5. Measure the plug gap with a feeler gauge.
Correct as necessary by bending the side electrode.
The gap should be:
0.70-0.80
mm 10.028-0.031
in)
4
PLUG GAP
6. Make sure that the spark plug washer is in good condition and thread the
spark plug in by hand to prevent cross-threading.
7.After the spak plug is seated, tighten with a spark plug wrench to
compress the washer.
NOTE:
If installing a new spark plug, tighten l/2 turn after the spark plug seats to
compress the washer. lf reinstalling a used spark plug, tighten l/8 to l/4
turn after the spark plug seats.
L
1
l
Use only the recommended spark plugs or equivalent. Spark plugs
which have an improper heat range may cause engine damage.
l
The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and may damage the engine.
.
27

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