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SPARK PLUG
Maintenance Interval: The spark plug should be remove from the engine and checked after each 25
hours of operation and replaced after every 100 hours of operation.
Maintenance: With the engine at ambient (room)
temperature, twist the high tension lead boot on the spark
TIPS
0.024 — 0.028 in.
plug back and forth a couple of times to loosen boot, then
(0.6 — 0.7 mm)
pull the boot off of the spark plug. Remove the spark plug.
The electrodes can be cleaned with a stiff brush. Adjust
the electrode air gap to 0.024 – 0.028 in. (0.6 – 0.7 mm).
Replace the spark plug if it is oil-fouled, damaged, or if the
electrodes are worn down. Do not overtighten the spark
plug when installing. The tightening torque is 95 – 148 in.
lbs.(10.7 – 16.6 Nm). Reinstall the cylinder cover.
CYLINDER COOLING FINS
Maintenance Interval: The cylinder cooling fins should be cleaned after every 25 hours of operation or
once a week which ever comes first. Air must flow 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.
Maintenance: With the engine at ambient (room) temperature, remove the two socket head screws, keep
remove the cover (FIG.1). Remove the two socket head screws and remove the tail pipe (FIG.2). Loosen
the cylinder cover screw (knob) and lift off the cylinder cover (FIG.3). Clean all dirt and debris from the
cooling fins and from around the cylinder base. Reinstall the cylinder cover, tail pipe, and the cover.
FIG.1
FIG.2
─ 17 ─
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