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4. Inspect the electrodes and center
porcelain for deposits, erosion or
carbon fouling. If the erosion or deposit
is heavy, replace the plug. Clean a
carbon or wetfouled plug with a plug
cleaner, otherwise use a wire brush.
5. Check the spark plug gap (2) using a
wire-type feeler gauge. If adjustment is
necessary, bend the side electrode (3)
carefully.
The gap should be:
0.8 - 0.9 mm (0.03 - 0.04 in)
(2) Spark plug gap
E
(3) Side electrode
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 each 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:
a) First, tighten the plug:
NGK: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
Improperly tightened spark plug can
damage the engine. If a plug is too loose, a
piston may be damaged. If a plug is too tight,
the threads may be damaged.
9.
Reinstall the spark plug caps.
10. Install the remaining parts in the
reverse order of removal.
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