the insulation ring on it is broken or cracked.
Clean the spark plug with a brush when put it back in place.
3) Check the plug gap with a feeler gauge.
Vary the gap by moving the side electrode.
Normal plug gap: 0.70~0.80mm
4) Check the plug O-r
ing for normal condition. Screw it in with the
plug wrench to protect the plug thread.
NOTE:
g
In the case of screwing in a new spark plug, tighten it by an
additional 1/2 screw turn after the plug reaches and pushes on the
O-ring, while in the case of a
used spark plug, an additional 1/2~1/4
screw turn is necessary.
CAUTION:
g
Make sure the spark plug is properly tightened. Improper
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