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4.
Apply a light coat of motor oil (SAE 30 or
equivalent viscosity) to the foam element and
squeeze out all excess oil.
5.
Reassemble the filter screen and foam element to
the air filter body.
6.
Reinstall the air filter cover and tighten the knob.
Fuel Filter
Maintenance Interval
• The fuel filter should be replaced after every 100
hours of operation.
• Fuel filters needing more frequent replacement may
indicate debris in fuel tank.
Fuel Filter Replacement
The fuel filter is attached to the end of the fuel pick-up
hose inside the fuel tank.
Wire
Fuel Filter
To replace the fuel filter:
1.
Make sure the fuel tank is empty.
2.
Remove the fuel cap.
3.
Using a wire hook, gently pull the fuel filter out
through the fuel filler opening.
Use caution not to "fishhook" the fuel hose.
Replace immediately if punctured!
4.
Grasp the fuel hose next to the fuel filter fitting
and remove the filter, but do not release the hose.
5.
While still holding on to the fuel hose, attach the
new fuel filter.
6.
Drop the new fuel filter back into the fuel tank.
7.
Make sure that the fuel filter is not stuck in a
corner of the tank, and that the fuel hose is not
doubled over (kinked) before refueling.
Spark Plug
Maintenance Interval
• The spark plug should be removed from the engine
and checked after each 25 hours of operation.
• Replace the spark plug after every 100 hours of
operation.
Fuel Pick-up Hose
— US-18 —
Spark Plug Maintenance
1.
Twist the high tension lead boot on the spark plug
back and forth a couple of times to loosen the
boot, then pull the boot off of the spark plug.
2.
Remove the spark plug.
3.
Clean the electrodes with a stiff brush.
4.
Adjust the electrode air gap to .024-.028 in. (0.6-
0.7 mm).
5.
Replace the spark plug if it is oil-fouled, damaged,
or if the electrodes are worn down.
6.
Do not overtighten the spark plug when installing.
The tightening torque is 95-148 in∙lbs. (10.7-16.6 N·m).
.024" - .028" (0.6 - 0.7 mm)
7.
Always use only the specific heat range of spark plug.
This is particularly critical with today's low-emission
engines. For best results, use the exact replacement.
Cylinder Cooling Fins
Maintenance Interval
• The cylinder cooling fins should be cleaned after
every 25 hours of operation, or once a week,
whichever comes first.
• Air must f low freely around and through the
cylinder cooling fins to prevent engine overheating.
Leaves, grass, dirt and debris buildup on the fins
will increase the operating temperature of the
engine, which can reduce engine performance and
shorten engine life.
Cooling Fin Cleaning
1.
With the engine at ambient (room) temperature,
loosen the knob and remove the air filter cover.
2.
Twist the high tension lead boot on the spark plug
back and forth a couple of times to loosen the
boot, then pull the boot off of the spark plug.
3.
Loosen the knob and lift off the cylinder cover.
4.
Clean all dirt and debris from the cooling fins and
from around the cylinder base.
5.
DO NOT overlook cleaning of the cooling air
intake area below the crankcase and above the
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