Poulan 3300 - Manual (Page 19)

D. CARBURETOR ADJUSTMENTS
• Poor engine performance can be a result of other
causes such as dirty air filter, carbon buiid-upon
muffler outlets, etc. See “TVouble Shooting
Chart” before proceeding with carburetor
adjustments.
• Fbrthe best results, Beaird-Poulan recommends
that you have a qualified service dealer make all
carburetor adjustments.
Yourdealer hasthetrain-
ing, experience and tools necessary to properlyadjust
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, followthe described procedures
very carefully.
• The carburetor has been adjusted at the factory
for sea level conditions. Adjustments may become
necessary if the unit is used at significantly higher
altitudes or if you notice any of thefollowing 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 airfiltercleaning. “See "5. Highspeed Mix­
ture Adjustment.”
ICAUfiON:! Permanent damage will occurto any
2-cycle engine if incorrect carburetor adjust­
ments are made.
• If theunit will not operate properly after making
these adjustments, take the unit to a qualified
service dealer.
______
A WARNING
The chain will be moving during mostof thisprocedure.
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, flatsurfaceand makesure
the chain will not contact any object.
d. Locate the three (3) carburetor adjusting screw
openings to the right oftheairfilter cover. Figure 40.
e. Start the engine and allow engine to idle 3 minutes
to warm up. The engine must be at operating
temperature for proper adjustments to be made.
2. IDLE SPEED ADJUSTMENT
a. Allow engine to idle.
b.
AdjustIdleSpeedScrewuntilenginecontinuesto
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
clockwise A 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 Speed 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 aturn at a time
counterclockwise
until you have smooth
acceleration.
5. HIGH SPEED MIXTURE ADJUSTMENT
I CAUTION-1 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 1/16ofaturn
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 CAUTIONFI a too 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 for clockwise that you
have high speed but lack power while cutting. An
effective approach follows:
— Turn screw counterclockwise A until
engine loses power while cutting.
— Then, turn screw clockwise wHk 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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