Honda Power Products HHH25D Manuel De L'utilisateur page 54

5.Visually inspect the spark plug. Discard the spark plug if there is
apparent wear, or if the insulator is cracked or chipped. Clean the
spark plug with a wire brush if it is to be reused.
6.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 (0.024 – 0.028 in)
7.Check that the sealing washer is in good condition and thread the
spark plug in by hand to prevent cross-threading.
8.After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
When installing a new spark plug, tighten 1/2 turn after the spark plug
seats to compress the washer. When reinstalling a used spark plug,
tighten 1/8 – 1/4 turn after the spark plug seats to compress the washer.
CAUTION:
The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and may damage the engine.
9.Attach the spark plug cap securely.
10. lnstall the top cover, and tighten the flange bolt securely.
Be careful not to tuck down the packing when you install the top cover.
0.6 – 0.7 mm
(0.024 – 0.028 in)
SEALING WASHER
51