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Checking Spark Plug
WARNINg
DO NOT check for spark with spark plug removed. DO NOT crank
engine with spark plug removed.
WARNINg
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
NOTE: Check the spark plug once a season or every 25 hours of
operation. Change the spark plug once a season or every 100 hours.
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
1.
Remove the spark plug boot and use a spark plug wrench to
remove the plug. See Figure 13.
2.
Visually inspect the spark plug. Discard the spark plug if there is
apparent wear, or if the insulator is cracked or chipped. Clean the
spark plug with a wire brush if it is to be reused.
3.
Measure the plug gap with a feeler gauge. Correct as necessary
by bending side electrode. See Figure 14. The gap should be set
to .02-.03 inches (0.60-0.80 mm).
4.
Check that the spark plug washer is in good condition and thread
the spark plug in by hand to prevent cross-threading.
5.
After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
NOTE: When installing a new spark plug, tighten 1⁄2-turn after the
spark plug seats to compress the washer. When reinstalling a used
spark plug, tighten 1⁄8- to 1⁄4-turn after the spark plug seats to
compress the washer.
CAUTIoN
The spark plug must be tightened securely. A loose spark plug can
become very hot and can damage the engine.
Maintenance & Service
17
Spark Plug
Figure 13
Electrode
.02-.03 in.
(0.60-0.80 mm)
Figure 14
Spark Plug Boot
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