Honda EU20i Manuel De L'utilisateur page 47

5.Visually inspect the spark plug. Discard it if the insulator is cracked,
chipped, or fouled. 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 carefully bending the side electrode.
The gap should be:
0.6–0.7 mm (0.024–0.028 in)
0.6–0.7 mm
(0.024–0.028 in)
SEALING WASHER
7.Install the spark plug carefully by hand, to avoid cross-threading.
8.After a new spark plug has been seated by hand, it should be
tightened 1/2 turn with a wrench to compress the sealing washer.
If a used plug is being reinstalled, it should only require 1/8 to 1/4
turn after being seated.
9.Reinstall the spark plug cap on the spark plug securely.
10. Reinstall the spark plug maintenance cover.
CAUTION:
• The spark plug must be securely tightened. An improperly tightened
plug can become very hot and possibly damage the generator.
• Never use a spark plug with an improper heat range.
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INSULATOR
SIDE ELECTRODE