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7. Tighten with wrench to compress washer. If spark
plug is new, use 1/2 turn to compress washer
appropriate amount. If reusing old spark plug, use
1/8 to 1/4 turn for proper washer compression.
NOTE:
An improperly tightened spark plug will become
very hot and could damage the engine.
8. Reinstall the spark plug cap (B).
A
Air Filter Maintenance
For proper performance and long life, keep air filter
clean.
1. Turn the knob (A) on the bottom of air the filter
cover to release the cover. Remove cover (B) and
set aside.
2. Remove the filter element (C).
3. If the filter element is dirty, clean with warm,
soapy water. Rinse and let dry.
4. Apply a light coat of engine lubricant to the
element, then squeeze it out.
5. Replace the element (C) in the air filter unit.
6. Replace the air filter cover (B) and fasten knob (A).
A
B
A-Fasten knob
B-Air filter cover
B
A - Spark plug
B - Spark plug cap
0.7 - 0.8 mm
0.028 - 0.031 in.
D
C
C-Filter element
D-Air filter unit
Cleaning the Spark Arrestor
1. Allow the engine to cool completely before
servicing the spark arrestor.
2. Loosen the screw (A) to be able to remove clamp
(B) and cover plate (C).
3. Remove the spark arrestor screen (D).
4. Carefully remove the carbon deposits from the
spark arrestor screen with a wire brush.
5. Replace the spark arrestor if it is damaged.
6. Position the spark arrestor on the muffler and
attach with the screws removed in step 2.
NOTE:
This product is equipped with a spark arrestor that
has been evaluated by the USDA Forest Service;
however, product users must comply with Federal,
State, and local fire prevention regulations. Check
with appropriate authorities. Contact customer
service or a qualified service center to purchase a
replacement spark arrestor.
C
B
A
Valve Clearance
Important: Please contact Authorized Service Center
for service assistance. Proper valve clearance is
essential for prolonging the life of the engine. Check
valve clearance per maintenance schedule.
Valve
0.004~0.006 inch
Clearance
Torque
NOTICE
Checking and adjusting valve clearance must be
done when the engine is cold.
Page 20
D
Intake Valve
Exhaust Valve
0.006~0.008 inch
0.1~0.15 mm
0.15~0.2 mm
10-12 N·M
10-12 N·M
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