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4. Visually inspect the spark plug. If it is cracked or chipped, or if
the electrodes are worn or burned, discard it and replace with a
new spark plug.
5. If re-using the spark plug, use a wire brush to clean any dirt
from around the spark plug base, then re-gap the spark plug.
6. Measure the plug gap with a spark plug gap gauge. The gap should be 0.7 - 0.8 mm (0.028 - 0.031 in)
(Fig. 30). Carefully adjust the gap if necessary.
7. Screw the spark plug back into the spark plug hole using the spark plug wrench. Do not over-tighten
spark plug. Recommended tightening of spark plug is ½ to ¾ of a turn (15 ft-lb torque/20.33 Nm) after
spark plug gasket contacts spark plug hole.
8. Reinstall the spark plug cap and maintenance cover.
SPARK ARRESTOR MAINTENANCE
Inspect and clean the spark arrestor every 100 hours of operation.
The spark arrester is located outside the muffler, which gets very hot during operation. Allow the engine to
cool completely before servicing the spark arrester. To inspect and clean the spark arrester:
1. Remove the two screws, and remove the tail pipe and spark
arrester.
2. Use a brush to remove carbon deposits from the spark arrester
screen. Be careful to avoid damaging the screen.
The spark arrester must be free of breaks and tears. Replace the
spark arrester if it is damaged.
3.Install the spark arrester in the reverse order of removal.
MAINTENANCE
28
0.7 - 0.8 mm
0.028 - 0.031 in.
Fig. 30
Fig. 31
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