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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.
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- 0.7mm).
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. 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.
All manuals and user guides at all-guides.com
Cooling Fin Cleaning
1. With the engine at ambient (room) temperature,
2. Twist the high tension lead boot on the spark plug
3. Loosen the knob and lift off the cylinder cover.
4. Clean all dirt and debris from the cooling fins and
5. DO NOT overlook cleaning of the cooling air intake
6. Reinstall the fan cover and the filter cover.
Spark Arrester
― US - 21 ―
loosen the knob and remove the air filter cover.
back and forth a couple of times to loosen the boot,
then pull the boot off of the spark plug.
from around the cylinder base.
area below the crankcase and above the fuel tank! This
area must be free of debris and obstruction for the
engine to cool properly.
High Tension
Lead Boot
Air Filter Cover
Knob
WARNING
POTENTIAL HAZARD
• Muffler surface becomes hot when the Pruner is 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.
Knob
Cylinder Cover
Cooling
Fins
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