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5.
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 wet-
fouled plug with a plug cleaner, otherwise
use a wire brush.
6.
Check the spark plug gap (
wire-type feeler gauge. If adjustment is
necessary, bend the side electrode (
carefully.
The gap should be:
0.80 0.90 mm (0.031 0.035 in)
−
(3)
(2) Spark plug gap
2
) using a
3
)
−
(2)
(3) Side electrode
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7.
Make sure the plug washer is in good
condition.
8.
With the plug washer attached, thread
the spark plug in by hand to prevent
cross-threading.
9.
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:
NGK:
1/2
DENSO:
3/4
b)
Then loosen the plug.
c)
Next, tighten the plug again:
1/8 turn after it seats.
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.
10.
Reinstall the spark plug cap.
11.
Install the removed parts in the reverse
order of removal.
turn after it seats.
turn after it seats.
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