Poulan 2100 - Manual (Page 19)

D. CARBURETOR ADJUSTMENTS
• Poor engine x>erformance can be a result of
other causes such as dirty air filter, carbon
build-up on muffler outlets, etc. See the
*Trouble Shooting Chart** before proceed­
ing with carburetor adjustments.
• For best results, it is recommended that you
have a qualified service dealer make all car­
buretor adjustments. Your dealer has the train­
ing, experience, and tools necessaiy to properly ad­
just you saw to meet our factory performance speci­
fications, This service is Tiot covered by warraTiiy. If
it becomes necessaiy for you to make carburetor
adjustments yourself, follow the described proce­
dures very carefully.
• The carburetor has been adjusted at the fac­
tory 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 de­
scribed 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 acceler­
ate, See “4, Acceleration Adjustment.”
— Loss of cutting power which is not corrected by
air filter cleaning. See “5. Hig^ Speed Mixture
_____ Adjustment. ”
I
CAUTION; , I Permanent damage will occur to
any 2-cycle en^ne if incorrect carburetor
adjustments are made,
• If the unit will not operate properly after
making these adjustments, take the saw to a
qualified service 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 the 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 screw
openings to the right of the air filter cover. Fig­
ure 37.
e. Start the engine and allow engine to idle three
(3) minutes to warm up. The engine must be at
operaungtemperatureforproperadjustmerttsto
be made.
Idle Speed
Screw High Speed
Mixture
Screw
bow Speed
• • Miv+tirtì ftr Mixture Screw
2. IDLE SPEED ADJUSTMENT
a. Allow the engine to idle.
b. Adjust the Idle Speed Screw untU the engine
continues to run without stalling and without
the chain moving.
— Turn screw clockwise to increase engine
speed if engine staMs or dies.
— Turn screw counterclockwise to slow engine
down and!or to keep the chain from turning.
c. No further adjustments are necessaiy if
the chain does not move at idle speed and
if x>erformance is satisfactory.
A WARNING
In “3. Low Speed Mixture Adjustment,** reeheck
idle speed aher each adjustment. The chain
must not move at idle speed.
3. LOW SPEED MIXTURE ADJUSTMENT
a. Allow engine to idle,
h. Turn the Low Speed Mixture Screw slowly
clockwise until the RPM starts to drop. Note
the position.
c. Turn the Low Speed Mixture Screw slowly
counterclockwise 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 the engine dies or hesitates instead of accelerat­
ing, turn the Low Speed Mixture Screw 1/16 of a
turn at a time counterclockwise untU you have
smooth acceleration.
5. HIGHSPEED MIXTURE ADJUSTMENT
ICAUTIQN; \ Adjustments as small as 1/16 of a
turn can affect eiigiue performance. It is im-
poitant to turn the screw only 1/16 of a turn
per adjustment and test the x>erformance 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.
Figure 37
I.CAUTIQN 1 J ^ lean hi^ speed setting
(clockwise adjustment) will cause engine
damage to any 2-cycle engine from over­
heating and lack of lubrication. Never set
the hi^ speed mixture screw so far clock­
wise that you have high speed but lack pow­
er while cutting;. An effective approach fol­
lows.
— Turn screw counterclockwise until engine loses
power while cutting.
— Then, turn screw clockwise in 1/16 of a turn in­
crements only unul the engine has power while
cutting.
NOTE: If the unit wiU not operate properly after
making these adjustments, take the saw to a quali­
fied service dealer.
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