21
SERVICE AND MAINTENANCE
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
WARNING
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. Replace-
ment 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 overheat-
ing and ignition of accumulated debris.
CAUTION
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.
Plastic Rib
Feature
Shroud
Plastic
Feature
Air Filter
Cover
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 18.
WARNING
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
Spark Plug
Spark Plug Boot
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 19. The gap should be set
to 0.024-0.031 in.
Figure 17
Figure 19
Figure 18
