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6.
Attach the air filter cover, making sure to align plastic rib features on the
shroud to the plastic features on the air filter cover. See Figure 18. Turn
thumb screws clockwise until snug. Check for any misalignment.
Air Filter
Cover
Plastic
Feature
Spark Plug Service
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 19.
Spark Plug Boot
WARNING
If the engine has been running, the muffler will be very hot. Be careful not
to touch the muffler.
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.
SERVICE AND MAINTENANCE
Shroud
Plastic Rib
Feature
Figure 18
Spark Plug
Figure 19
3.
Measure the plug gap with a feeler gauge. Correct as necessary by bending
side electrode. See Figure 20. The gap should be set to 0.024-0.031 in.
Electrode
0.024-0.031 in.
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 1/8-1/4 turn after the spark plug seats to compress the washer.
IMPORTANT: The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and may damage the engine.
Muffler
Temperature of muffler and nearby engine areas may exceed 150˚ F (65˚C).
Avoid contact with these areas.
•
Inspect muffler periodically, and replace if necessary. Replacement parts
for the muffler must be the same and installed in the same position as the
original parts.
Clean Engine
•
Daily or before every use, clean grass, chaff or accumulated debris from
engine. Keep linkage, spring, and controls clean.
•
Keep area around and behind muffler free of any combustible debris.
•
Keeping engine clean allows air movement around engine.
•
Engine parts should be kept clean to reduce the risk of overheating and
ignition of accumulated debris.
Do not use water to clean engine parts. Water could contaminate fuel
system. Use a brush or dry cloth.
Carburetor Adjustment
•
The carburetor on this engine is not adjustable.
21
Figure 20
WARNING
CAUTION
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