−
−
0.031
0.035 in (0.80
0.90 mm)
81
Spark Plug
Servicing Your Honda
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.
Disconnect the spark plug cap.
Tighten the spark plug:
With the plug washer attached, thread the
spark plug in by hand (to prevent cross-
threading).
If you have to install a new plug, first check
the gap.
Make sure the plug washer is in good
condition.
Check the spark plug gap ( ), using a wire-
type feeler gauge. If adjustment is necessary,
bend the side electrode carefully. The gap
should be:
Inspect the spark plug electrodes for wear.
The center electrode ( ) should have square
edges. The side electrode ( ) should not be
eroded. The insulator should not be cracked
or chipped.
If installing a new plug, tighten it twice to
prevent loosening:
If the old plug is good:
1/8 turn after it seats.
First, tighten the plug:
NGK:
turn after it seats.
DENSO:
turn after it seats.
Then loosen the plug.
Next, tighten the plug again:
1/8 turn after it seats.
Reinstall the spark plug cap. Take care to
avoid pinching any cables or wires.
Remove the spark plug with a plug wrench
( ) and handle.
2.
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7.
1
a.
b.
c.
3/4
1/2
2
3
4
8.
05/03/30 20:08:18 31KPS630_090
