Honda HS928 Owner's Manual page 49

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.
SERVICING YOUR SNOWBLOWER
SIDE ELECTRODE
0.028–0.031 in
(0.7–0.8 mm)
SEALING
WASHER
INSULATOR
47