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3. Remove the fan housing.
4. Use a 9/16" socket wrench on the flywheel
nut to keep the crankshaft from moving.
Figure 49.
NOTE: Place the socket handle forward as
shown in Figure49.
5. Remove the clutch with a 3/4" socket or end
wrench in a clockwise direction. Fiqure50.
[CAUTION:_ Do not remove the clutch with a
punch or a power tool to avoid damage or
breakage to the clutch.
6. Remove worn sprocket and replace.
7. Install clutch in a counterclockwise direction.
Figure50.
8. Hold flywheelbyhand and tightenclutchwitha 3/4
socketwrench.
NOTE: Do not hold a wrench on the flywheel
nut when replacing the clutch. This could
loosen the flywheel nut•
9. Reinstall fan housing, bar,chain and bar clamp
housing.
REMOVE CLUTCH
CLOCKWISE
INSTALL CLUTCH
COUNTERCLOCKWISE
2O
Em
Figure49
Figure 50
CARBURETOR ADJUSTMENTS
• The-carburetor has been adjusted at the fac-
tory for sea level conditions. Adjustment may
become necessary if the unit is used at
significantly higher altitudes or if you notice
any of the following conditions:
--Chain moves with the engine at idle speed.
--Loss of cutting power which is not cor-
rected by air filter or muffler screen clean-
ing.
--Engine dies or hesitates when it should
accelerate•
• Permanent damage will occur to the engine if
incorrect carburetor adjustments are made. To
make the adjustment, follow the procedure below
very carefully.
I _WARNING
The chain may be moving during this procedure.
Wear your protective gear and observe all of the
. safety precautions.
1. PREPARATION
a. Stop engine.
b. Use a fresh fuel mixture with proper
gasoline/oil ratio.
c. Place the saw on a solid, flat surface and
make sure the chain will not contact any
object.
d. Locate the three (3) carburetor adjusting
screwsIocatedonthe fan housing side of thesaw.
Figure 51.
e. Turn the Low Speed Mixture Screw and the
High Speed Mixture Screw clockwise
just until they stop. Do not turn the screws
until they are tight as you may damage
the needle seats.
f. Turn the Low Speed Mixture Screw and the
High Speed Mixture Screw one ful! turn
counterclockwise a--,,
IDLE
SPEED ADJ. SCREW
•LOW HIGH
SPEED
ADJ. : ADJ;
SCREW
Figure 51
2. IDLE SPEED ADJUSTMENT--I
a: Start the engine and allow to idle.
Adjust if the engine dies or stops by turning
the Idle Speed Screw 1/2 turn clockwise
NOTE: To increase idle speed, turn the Idle
Speed Screw clockwise _ . To
decrease idle speed, turn the Idle Speed
Screw counterclockwise
c. Run the engine for a few minutes to bring it
up to operating temperature.
NOTE: The engine must be at operating
temperature for proper adjustments to be
made.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Turn the Low Speed Mixture Screw slowly
clockwise _ until the RPM starts to
drop. Note the position.
b. Turn the Low Speed Mixture Screw coun-
terclockwise _ until the RPM speeds
up and starts to drop again. Note the posi-
tion.
c. Set the Low Speed Mixture Screw at the
mid-point between the two positions.
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