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MAINTENANCE
2. Remove the spark plug cap (A).
3. Clean any dirt from around the base of the spark plug.
4. Using the provided park plug wrench (B), remove the
spark plug.
5. Inspect the electrode for wear and carbon buildup.
Look for a sharp outer edge with no rounding or
erosion of the electrode.
6. Inspect spark plug. Replace if electrodes are worn or
if insulator is cracked, chipped, or fouled.
7. Clean the spark plug with a wire brush if it is to be
reused.
8. Using a wire-type feeler gauge, measure the spark
plug electrode gap. If necessary, correct the gap by
carefully bending the side electrode. The gap should
be 0.028-0.031in (0.7-0.8mm). Correct as necessary
by carefully bending the side electrode.
9. Ensure the spark plug sealing washer is in good
condition and thread the spark plug in by hand to
prevent cross-threading.
10. After a new spark plug has been seated by hand, it
should be tightened 1/2 turn with a wrench to
compress the sealing washer. If a used plug is being
reinstalled, it should only require 1/8 to 1/4 turn after
being seated.
A loose spark plug can overheat and damage the
engine. Over tightening the spark plug can damage
the plug threads.
Never use a spark plug with an improper heat range.
11. Re-install the spark plug cap and close the
maintenance cover.
inspect electrode for
wear and buildup
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