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3. Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator
is cracked or chipped.
4. Measure the spark plug electrode gap with a suitable gauge. Correct the gap if
necessary, by carefully bending the side electrode. The gap should be: 0.028
－
0.031 in (0.70
－
0.80 mm).
5. Install the spark plug carefully, by hand, to avoid cross-threading.
6. After the spark plug seats, tighten with a spark plug wrench to compress the
sealing washer.
If reinstalling the used spark plug, tighten 1/8
－
1/4 turn after the spark plug
seats.
If installing a new spark plug, tighten 1/2 turn after the spark plug seats.
A loose spark plug can overheat and damage the engine.
Over tightening the spark plug can damage the threads in
the cylinder head.
7. Attach the spark plug cap.
SPARK ARRESTER SERVICE (optional equipment)
Your engine is not factory-equipped with a spark arrester. In some areas, it is
illegal to operate an engine without a spark arrester. Check local laws and
regulations. A spark arrester is available from authorized servicing dealers.
The spark arrester must be serviced every 100 hours to keep it functioning as
designed.
If the engine has been running, the muffler will be very hot. Allow the muffler to
cool before servicing the spark arrester.
SPARK PLUG
CAP
SPARK PLUG
WRENCH
0.70-0.80mm
SEALING
WASHER
