Poulan 4400 - Manual (Page 11)

CARBURETOR ADJUSTMENT
(Model 4400/4900/5400)
STOP THE ENGINE ~ Make sure you are using clean, fresh
fuel mixture at the correct gasoline/oil ratio. THE AIR
FILTER MUST BE CLEAN AND FASTENED SECURELY.
The cylinder shield should be in place and fastened securely.
1. Turn the high speed and low speed mixture screws
clockwise until they stop. DO NOT TIGHTEN OR
FORCE THE SCREWS ANY FARTHER! YOU MAY
DAMAGE THE NEEDLE SEATS. Turn the high speed and
low speed mixture screws 1 full turn counterclockwise.
Figure 19.
CAUTION! THE CHAIN WILL BE MOVING DURING
THE FOLLOWING PROCEDURE.
2. Start the engine and run for a few minutes to bring it to
operating temperature.
3. Squeeze the throttle trigger and run the engine at full RPM
for approximately 3 SECONDS, then allow it to return to
idle speed.
4. If the engine will not idle after it is warm, or it idles too
fast causing the chain to move, adjust the idle speed screw.
Turn the screw clockwise to increase idle speed,
counterclockwise to decrease idle speed. The idle
speed should be set as fast as possible, without causing the
chain to move.
5. Turn the low speed mixture screw clockwise until
the engine RPM increases and then starts to decrease. Note
this setting point. Now turn the screw counterclockwise
X. until the RPM starts to decrease again. Set the low
speed mixture screw midway between these two points.
6. Squeeze the throttle trigger quickly. If the engine dies or
hesitates, turn the low speed mixture screw 1/16 turn
counterclockwise iC . Repeat this procedure until the
engine will accelerate without hesitation.
CAUTION! THE HIGH SPEED MIXTURE SCREW MUST
NEVER BE SET AT LESS THAN 7/8 TURN OPEN. A^
LEAN MIXTURE WILL CAUSE THE ENGINE TO RUN
HOT AND DAMAGE IT.
7. With the high speed mixture screw 1 full turn open, make a
test cut with the saw. If the engine fails to have power and
run smoothly during the test cut, allow the engine to return
to idle speed, and turn the high speed mixture screw 1/16
turn clockwise Make another test cut. Continue this
procedure until the engine runs smoothly and with power
in the test cut. REMINDER-NEVER SET THE HIGH
SPEED MIXTURE SCREW LESS THAN 7/8 TURN OPEN.
8. After the low speed and high speed mixture settings are
made, it may be necessary to re-adjust the engine idle
speed. Refer to step 4.
AIR FILTER
Clean the air filter after every 10 tanks of gas or every 5
hours of operation.
TO CLEAN:
1. Close choke to prevent dirt from entering carburetor.
2. Remove the cylinder cover, then remove air filter. Fig. 20.
3. Separate the two air filter halves.
4. Using a soft bristled brush such as a small paint brush,
brush away all dust or other debris from the filter.
5. Clean by soaking in a non-oily, non-flammable solvent.
6. Allow to dry.
7. Before replacing filter clean away chips, saw dust, and
other debris on surfaces filter is to be placed on.
WARNING:
Do not operate your saw without the air filter in place.
Dirt and dust in the air can be drawn in carburetor caus­
ing damage to the engine.
MOUNTS:
Your saw is equipped with a counter-vibe system which
consists of 6 isolator mounts Fig. 21, Just as the shock
absorbers on a car protect you from jolts and bumps the
isolators protect the user from engine, bar and chain
vibration. Mounts should be checked daily when saw is in
operation and should be replaced when vibration appears
excessive or when mounts develop an out of round or
swollen shape. This is usually caused from being exposed
to gasoline and oil for long periods of time. IT IS
NECESSARY TO REPLACE ALL MOUNTS WHEN A
MOUNT FAILURE OCCURS.