E. carburetor adjustments, Tviiarning, Preparation – Poulan 3400 User Manual

Page 20: Idle speed adjustment— i, Low speed mixture adjustment, Idle speed adjustment—ii, High speed mixture adjustment

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CLOCKWISE

REMOVE CLUTCH

INSTALL CLUTCH

COUNTERCLOCKWISE

5. Remove the clutch with a 3/4" socket or end wrench

maclockwise

direction. Figure 48.

Figure 48

ICAUTIO^ Do not remove the clutch with a

punch or a powerful tool to avoid damage or
breakage to the clutch; •

. Remove worn drum/sprockejt-and replace.

7. Install clutch in a

counterclockwise

direction. Rg-

ure48.

. Hold flywheel by hand and tighten clutch with 3/4

socket wrench.

NOTE:

Do not hold a wrench on the flywheel nut

when replacing the clutch. This could loosen the
flywheel nut.

9. Reinstall fan housing, bar chain and bar clamp.

E. CARBURETOR ADJUSTMENTS

• The carburetor has been adjusted at the factory for

sea level conditions. Adjustment may become nec
essary if the unit is used at significantly higher al
titudes or if you notice any of the following conditions:

—Chain moves with the engine at idle speed.
— Loss of cutting power which is not corrected

by air filter or muffler screen cleaning.

— Engine dies or hesitates when it should accel

erate.

• Permanent damage will occur to the engine if in

correct carburetor adjustments are made.

It Is

best to let a qualified service dealer make carburetor
adjustments. If you choose to make the adjustments
yourself, follow the procedu re below very carefu lly.

TVIIARNING

The chain may be moving during this procedure.
Wear your protective gear and observe all of the
safety precautions.

1. PREPARATION

- a. Stop engine.

Use a fresh fuel mixture wifii proper gasoline/oil

ratio. '■■■■

------

Place the saw on a solid, flat surface and nriake

sure the chain will not contact any object,

d. Locate the three (3) Carburetor adjusting screws

located on the fan housing side of the saw. Figure

49.

Turn the Low Speed Mixture Screw and the

High Speed Mixture Screw Clockwise

just until they stop.

Do not turn Vie

screws

until

they qre tight as you m^ damage the needle

seats.

f. Turn the

Low Speed Mixture Screw

and the

High Speed Mixture Screw

one full turn coun-

tercloclwise

2. IDLE SPEED ADJUSTMENT— I

a. Start the engine and allow to idle.
b. Adjust if the engine dies or stops by turning the

ldleSpeedScrew1/2turncioclwise

speed,

turn the idle

. To decrease

Speed Screw coun-

Figure49

NOTE:

To increase idle

Speed Screw clockwise
idle speed, turn the Idle

terclockwise

c. Run the engine for a few minutes to bring it up

to operating temperature.

NOTE:

The engine must be at operating temper

ature for proper adjustments to be made.

3. LOW SPEED MIXTURE ADJUSTMENT

a. Turn the

Low Speed Mixture Screw

slowly

clockwise

until the RPM starts to

drop. Note the position.

b. Turn the

Low Speed Mixture Screw

coun

terclockwise

until the RPM speeds up

, . and startsto drop again. Note the position.

c. Set the

Low Speed MIxture Screw

at the mid

point between the two positions.

4. IDLE SPEED ADJUSTMENT—II

a. Allow engine to idle.
b. Adjust if the chain is turning by turning the

Idle

Speed Screw

counterclockwise

c. Squeeze the throttle trigger: the saw should ac

celerate without hesitafing.

NOTE:

It may be necessary to recheck the low

speed mixture setting after the idle speed has
been reduced by repeating “Low Speed Mixture
Adjustment” as in step 3 above.

5. HIGH SPEED MIXTURE ADJUSTMENT

a. Make a test cut.
b. Adjust

the saw smokes or seems to have low

power

the test cut by turning the

High Speed

Mixture Screw

1/16

th of a turn clockwise^^.

c. Repeat test cut.
d. Repeat adjustrnerit until the saw runs smoothly.