Carburator Adjustements - Poulan Pro 3300 Counter-Vibe Operator's Manual

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D.
CARBURETOR ADJUSTMENTS
• Poor engine performance can bea 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.
• Forthe best results, Beaird-Poulan recommends
that you have a qualified service dealer make all
carburetor adjustments. "Your dealer has thetrain-
ing,experience and toolsnecessary to properly adjust
your saw to meet our factory performance specifica-
tions. This service is not covered by warranty. If +t
becomes necessary for you to make carburetor
adjustments yourself, followthe described procedures
very carefully.
• The carburetor has been adjusted at the factory
for sea level conditions. Adjustmentsmay become
necessary if the unit is used at s{gnificantlyhigher
altitudes or if you notice any ofthe 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
by air filter cleaning. "See" 5. High Speed Mix-
ture Adjustment."
I CAUTION:I Permanent damage will occur to any
2-cycle engine if incorrect carburetor adjust-
ments are made.
• If the unit will not operate properlyafter making
these adjustments, take the unit to a qualified
service dealer.
WARNING
The chain will be moving during most ofthis procedure.
Wear your protective gear and observe all safety
precautions.
1. PREPARATION
a. Stop engine.
b. Use a fresh fuel mixture with proper gasolinel
oil ratio.
c. Place the saw on asolid, flatsurfaceand makesure
the chain will not contact any object.
d. Locate the three (3) carburetor adjusting screw
openings to the right ofthe air filtercover.Figure 40.
e. Start the engine and allow engineto idle 3 minutes
to warm up. The engine must be at operating
temperature for proper adjustments to be made.
IDLE
Figure 40
2. IDLE SPEED ADJUSTMENT
a. Allow engine to idle.
b. AdjustIdle Speed Screw untilenginecontinuesto
run withoutstalling and withoutthechain moving.
--Turn screw clockwise _ to increase
engine speed ff engine stallsor dies.
-- Turnscrew 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.
_ILWARNING
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
clockwise _ until the RPM starts to drop.
Note the position,.
c. Turnthe Low Speed Mixture Screw counterclock-
wise _ untilthe RPM speeds up and starts
to drop again. Note the position.
d. Set the Low Speed Mixture Screw at the mid-
point between the two positions.
4. ACCELERATION ADJUSTMENT
If engine dies or hesitates instead of accelerating, turn
the LOwSpeed Mixture ScR,w 1/16of aturn at a time
counterclockwise _ until you have smooth
acceleration.
5. HIGH SPEED MIXTURE ADJUSTMENT
I CAUTION:] Adjustments as small as 1/16 of a
turn can affect engine performance. It is impor-
tant to turn the screw only 1/16of 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 1/16of 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 1116 of a turn adjustments until the saw
runs smoothly in cut.
tCAUTION: ] Atoo lean high speed setting (clock-
wise _ adjustment) will cause engine
damage to any 2+cycle engine from overheating
and lackof lubrication. 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 will not operate properly after
making these adjustments, take the unitto a qualified
service dealer.
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