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8.
Inspect the electrodes and center
porcelain for deposits, erosion or carbon
fouling.
u If the erosion or deposit is heavy,
replace the plug.
9.
Make sure that a 1.0 mm wire-type feeler
gauge cannot be inserted between the
spark plug gap. If the gauge fits in the
gap, replace the plug with a new one.
10.
Make sure the plug washer is in good
condition.
11.
Install the spark plug. With the plug
washer attached, thread the spark plug in
by hand to prevent cross-threading.
12.
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:
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 loose, a piston may be
damaged. If a plug is too tight, the threads may
be damaged.
13.
Reinstall the spark plug cap. Take care to
avoid pinching any cables or wires.
14.
Install the parts in the reverse order of
removal.
Spark Plug u Checking Spark Plug
Maintenance
59
Spark plug gap
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