2.
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.
3.
Measure the plug gap with a feeler gauge. Correct as necessary
by bending the side electrode.
The gap should be:
0.70 0.80 mm (0.028 0.031 in)
−
−
0.70 0.80 mm
−
(0.028 0.031 in)
−
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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 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.
The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and may damage the
engine.
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