Honda F220 Owner's Manual page 37

Spark plug service
Recommended spark plug:
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
1.Remove the spark plug cap.
Use the spark plug wrench to remove the spark plug.
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
2.Visually inspect the spark plug. Discard it if the insulator is cracked
or chipped. Clean the spark plug with a wire brush if it is to be
reused.
3.Measure the plug gap with a feeler gauge.
Correct as necessary by bending the side electrode.
The gap should be: 0.6–0.7 mm (0.02–0.03 in)
SPARK PLUG WRENCH
4.Check that the spark plug washer is in good condition and thread the
spark plug in by hand to prevent cross-threading.
5.After seating it by hand, tighten a new spark plug 1/2 turn with the
wrench to compress the washer. If you are reusing a plug, it should
only take 1/8–1/4 turn.
CAUTION:
The spark plug must be securely tightened. An improperly tightened
plug can become very hot and possibly damage the engine.
Never use a spark plug with an improper heat range.
34
CR4HSB (NGK)
U14FSR-UB (DENSO)
0.6–0.7 mm
(0.02–0.03 in)
SIDE ELECTRODE
SPARK PLUG