Honda HS724 Owner's Manual page 46

SERVICING YOUR SNOWBLOWER
5.Measure the plug gap with a 
wire-type feeler gauge. Correct as
necessary by carefully bending
the side electrode.
The gap should be:
0.028–0.031 in (0.7–0.8 mm)
6.Make sure that the spark plug
sealing washer is in good
condition, and thread the spark
plug in by hand to prevent 
cross-threading.
7.After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
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.
The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and may damage the engine.
44
SIDE ELECTRODE
0.028–0.031 in
(0.7–0.8 mm)
WASHER
INSULATOR