Honda HS622 Owner's Manual page 39

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 (0.028-0.031 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. If reinstalling a used spark plug, tighten l/8 to
l/4 turn after the spark plug seats.
pciq
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.
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