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Spark Plug u Checking Spark Plug
55
Maintenance
5.
Check the spark plug gap using a wire-
type feeler gauge.
uDo not adjust the spark plug gap. If the
gap is out of specification, replace the
spark plug with a new one.
6.
Make sure the plug washer is in good
condition.
7.
With the plug washer attached, thread
the spark plug in by hand to prevent
cross-threading.
8.
Tighten the spark plug:
● If the old plug is good:
1/8 turn after it seats.
● If installing a new plug, tighten it twice
to prevent loosening:
9.
Reinstall the spark plug cap. Take care
avoid pinching any cables or wires.
The gap should be:
0.031 to 0.035 in (0.80 to 0.90 mm)
Side
electrode
Spark plug gap
a) First, tighten the plug:
1/2 turn after it seats.
b)Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
An improperly tightened spark plug can damage the
engine. If a plug is too lose, a piston may be damaged. If
a plug is too tight, the threads may be damaged.
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