Spark Plug
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 Interval
• The spark plug should be removed from the engine
and checked after each 25 hours of operation.
Cooling Fin Cleaning
• Replace the spark plug after every 100 hours of
1. With the engine at ambient (room) temperature,
operation.
loosen the knob and remove the air filter cover.
Spark Plug Maintenance
2. Twist the high tension lead boot on the spark plug
back and forth a couple of times to loosen the boot,
1. Twist the high tension lead boot on the spark plug
then pull the boot off of 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.
2. Remove the spark plug.
4. Clean all dirt and debris from the cooling fins and
from around the cylinder base.
3. Clean the electrodes with a stiff brush.
5. Reinstall the fan cover and the filter cover.
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).
7. Always use only the specific heat range of spark plug.
This is particularly critical with today's lowemission
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 flow freely around and through the
cylinder cooling fins to prevent engine overheating.
Air Filter Cover
Cylinder Cover
High Tension
Lead Boot
Knob
Cooling
Fins
Knob
Spark Arrester
WARNING
POTENTIAL HAZARD
• Muffler surface becomes hot whenTrimmer
in operation and remains hot for
some time after the engine is shut off.
WHAT CAN HAPPEN
• Contact with hot muffler surfaces could cause
a burn.
HOW TO AVOID THE HAZARD
• Make sure the muffler is cool before inspecting
and cleaning the spark arrester.
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Summary of Contents for B23C
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