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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.
With the engine at ambient (room) temperature,
loosen the knob and remove the air cleaner cover
(Fig. 8).
2.
Loosen the knob and lift off the cylinder cover
(Fig. 8).
3.
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.
4.
Remove the spark plug.
5.
Clean the electrodes with a stiff brush (Fig. 23).
6.
Adjust the electrode air gap to .024–.028 in.
(0.6–0.7mm) (Fig. 23).
7.
Replace the spark plug if it is oil-fouled,
damaged, or if the electrodes are worn down.
8.
Do not overtighten the spark plug when
installing. The tightening torque is 95–148 in.
lbs. (10.7–16.6 N m).
9.
Reinstall the cylinder and air cleaner covers
(Fig. 8).
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.
Cooling Fin Cleaning
1.
With the engine at ambient (room) temperature,
loosen the knob and remove the air cleaner cover
(Fig. 8).
2.
Loosen the knob and lift off the cylinder cover
(Fig. 8).
3.
Clean all dirt and debris from the cooling fins
and from around the cylinder base.
4.
Reinstall the cylinder and air cleaner covers
(Fig. 8).
Spark Arrester
POTENTIAL HAZARD
Muffler surface becomes hot when 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.
Maintenance Interval
The spark arrester should be inspected and
cleaned after every 25 hours of use.
Replace the screen if it cannot be thoroughly
cleaned, or if it is damaged.
13
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