Poulan 2300 AV - Manual (Page 19)

D. CARBURETOR ADJUSTMENTS
• Poor engine performance can be a result of other
causes such as dirty air filter, carbon build-up on
muffler outlets, etc. See “Trouble Shooting
Chart” before proceeding with carburetor
adjustments.
• For best results, Poulan recommends that you
have a qualified service dealer make all car­
buretor adjustments.
Your dealer has the training,
experience and tools necessary to properly adjust
your saw to meet our factory performance specifica­
tions. This service is not covered by warranty. If it
becomes necessary for you to make carburetor
adjustments yourself, follow the procedures below
very carefully.
• The carburetor has been adjusted at the factory for sea
level conditions. Adjustments may become necessary
if the saw is used at significantly higher altitudes or if
you notice any of the following conditions:
NOTE: Be sure to properly prepare the saw as
described in “1. Preparation” below, before making
any adjustments.
— Chain moves when the engine runs at idle
speed. See “2. Idle Speed Adjustment."
— Saw will not idle. See “2. Idle Speed Adjust­
ment” and ”3. Low Speed Mixture Adjust­
ment.”
— Engine dies or hesitates when it should accel­
erate. See “4. Acceleration Adjustment.”
— Loss of cutting power which is not corrected
byairfiltercieaning. “See “5. High Speed Mix­
ture Adjustment.”
i CAUTION:! Permanent damage will occur to any
2-cycle engine if incorrect carburetor adjust­
ments are made.
• If the unit will not operate property after making
these adjustments, take the saw to a qualified ser­
vice dealer.
A warning
The chain will be moving during most of this pro­
cedure. Wear your protective gear and observe all
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, fiat surface and make sure
the chain will not contact any object.
d. Remove the two carburetor cover screws and
carburetor cover. Figure 45.
Locate the three (3) carburetor adjusting screw
openings to the right of the air filter cover. Figure 44.
Start the engine and allow engine to idle 3 minutes
to warm up. The engine must be at operating tem­
perature for proper adjustments to be made.
e.
f.
2. IDLE SPEED ADJUSTMENT
a. Allow engine to idle.
b. Adjust Idle Spaed Screw until engine continues to
run without stalling and without the chain moving.
— Turn screw clockwise to increase engine speed
if engine stalls or dies.
— Turn screw counterclockwise to slow engine
down and/or to keep the chain from turning.
c. No further adjustments are necessary if the
chain does not move at idle speed and if perfor­
mance is satisfactory.
A WARNING
Recheck idle speed after each adjustment below. The
chain must not move at idle speed to avoid serious
injury.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Allow engine to idle.
b Turn the Low Speed Mixture Screw slowly clock­
wise until the RPM starts to drop. Note the
position.
c. Turn the Low Speed Mixture Screw counterclock­
wise until the RPM speeds up and starts to drop
again. Note the position.
d. Set the Low Spe^ Mixture Screw at the mid­
point between the two positions.
4. ACCELERATION ADJUSTMENT
If engine dies or hesitates instead of accelerating, turn
the Low Speed Mixture Screw 1/16 of a turn at a time
counterclockwise until you have smooth acceleration.
5. HIGH SPEED MIXTURE ADJUSTMENT
I CAUTION: I Adjustments as small as 1/16 of a
turn can affect engine performance. It is impor­
tant to turn the screw only 1/16 of a turn per adjust­
ment and test the performance of the saw before
making further adjustments.
a. Make a test cut.
b. Adjust the High Speed Mixture Screw 1/16 of a turn
as follows:
— Clockwise if saw smokes or loses power.
— Counterclockwise if the saw has speed out of the
cut but lacks power in the cut.
c. Repeat test cut.
d. Continue 1/16 of a turn adjustments until the saw
runs smoothly in cut.
I CAUTIONTI A too lean high speed setting (clock­
wise adjustment) will cause engine damage to any
2-cycle engine from overheating and lack of lubri­
cation. Never set the high speed mixture screw so
far clockwise that you have high speed but lack
power while cutting. An effective approach
follows.
— Turn screw counterclockwise until engine loses
power while cutting.
— Then, turn screw clockwise in 1/16 of a turn
increments only until the engine has power
while cutting.
NOTE: If the unit wilt not operate properly after
making these adjustments,
take the saw to a
qualified service dealer.