14
MAINTENANCE
■
Make a test cut, then adjust the H needle for best cutting
power, not for maximum speed. The H needle is restricted
to 1/4 turn.
WARNING
THE SAW CHAIN SHOULD NEVER TURN AT IDLE.
Serious personal injury may result from the saw chain
turning at idle.
CLEANING THE STARTER UNIT
See Figure 62.
Use a brush or compressed air to keep the cooling vents (B)
of the starter assembly free and clean of debris.
CARBURETOR ANTI-FREEZE MECHANISM
See Figures 64 - 65.
The chain saw is designed with a ventilation hatch on the
right side of the cylinder cover which allows warm air to be
supplied from the engine to the carburetor to help prevent
icing under colder operating conditions. Operating the
chain saw in temperatures from 32ºF to 41ºF (0ºC to 5ºC)
at times of high humidity may result in ice forming within the
carburetor. This can cause the output power of the engine
to be reduced and/or the engine to fail to operate smoothly.
When operating under these circumstances, the chain saw
should be placed in anti-freeze mode before use.
To switch to anti-freeze mode:
■
Place the ignition switch in the OFF ( )position.
■
Remove the air cleaner cover (A).
■
Remove the air cleaner.
■
Lift choke knob (E) up to remove from the cylinder
cover (C).
■
Loosen the fi ve screws holding the cylinder cover in place.
Remove the cylinder cover.
■
Remove the icing cap (D) located on the right-hand side
of the cylinder cover by pressing down on it with your
fi nger.
■
Adjust the icing cap so that the “snow” mark faces
upward, then return it to its original position in the cylinder
cover.
■
Replace the cylinder cover and reinstall screws to
secure.
■
Replace choke knob, air cleaner, and air cleaner cover.
WARNING
Always return the unit to normal operating mode
if there is no danger of icing occurring. Continuing
to use the chain saw in anti-freeze mode when
temperatures have risen and returned to normal may
result in the engine failing to start properly or in the
engine failing to operate at its normal speed.
CLEANING THE ENGINE
See Figures 66 - 67.
Clean the cylinder fi ns (B) and fl ywheel fi ns (A) with
compressed air or a brush periodically. Dangerous
overheating of the engine may occur due to impurities on
the cylinder.
WARNING
Never run the saw without all the parts, including
the drivecase cover and starter housing, securely in
place.
Because parts can fracture and pose a danger of
thrown objects, leave repairs of the fl ywheel and
clutch to factory trained authorized service center
personnel.
NOTE: If you notice a power loss with the gas-powered
tool, the exhaust port and muffl er may be blocked with
carbon deposits. These deposits may need to be removed
to restore performance.
CHECKING THE FUEL FILTER
See Figure 68.
Check the fuel fi lter (B) periodically. Replace it if contaminated
or damaged.
REPLACING THE SPARK PLUG
See Figure 69.
This engine uses a Champion RZ7C or NGK CMR7H
spark plug with 0,64 mm electrode gap. Use an exact
replacement and replace every 50 hours or more frequently,
if necessary.
■
Loosen the spark plug by turning it counterclockwise with
a wrench (A).
■
Remove the spark plug.
■
Hand thread the new spark plug, turning it clockwise.
Tighten securely with wrench (B).
NOTE: Be careful not to cross-thread the spark plug.
Cross-threading will seriously damage the cylinder.
INSPECTING/CLEANING THE SPARK
ARRESTOR SCREEN AND MUFFLER
EXHAUST PORT
See Figure 70.
The muffl er is equipped with a spark arrestor screen. A faulty
spark arrestor screen can create a fi re hazard. Through normal
use the screen can become dirty and should be inspected
weekly and cleaned as required. Always keep the muffl er
and spark arrestor on the saw in good condition.
The chain saw should always be used with correctly mounted
spiked bumper.
WARNING
Muffler surfaces are very hot during and after
