Poulan 2100 User Manual download pdf (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. ”

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.

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.

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

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.

-19-

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Poulan 2100 User Manual Page 19

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