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:
0.80 - 0.90 mm (0.031 - 0.035 in)
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.
(3)
(2) Spark plug gap
(3) Side electrode
106
8. Tighten each spark plug:
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,
(2)
the threads may be damaged.
9.
10. Install the remaining parts in the reverse
• 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.
DENSO: 3/4 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
Reinstall the spark plug caps. Take care
to avoid pinching any cables or wires.
order of removal.