Snowmobile Arctic Cat (2008 year). Manual - part 72

4-4

Removing Carburetor

„NOTE: On twin carburetor models, remove the
carburetors using this basic procedure.

1. Turn the gas tank shut-off valve to the CLOSED

position.

2. Remove the mixing body top by rotating it coun-

terclockwise; then remove the top with spring,

plate, jet needle with E-clip, and piston valve from

the carburetor.

CM047

3. Remove the brass choke-cable housing from the

carburetor. Account for a washer.

CM048

4. Disconnect the fuel hose from the carburetor inlet

fitting.

AH284D

5. If applicable, disconnect the safety switch wiring

harness connector from the main wiring harness.

6. Loosen the carburetor-flange clamp; then remove

the carburetor.

CM049

„NOTE: Slide the carburetor into the air-intake
silencer boot until free of the flange; then remove
carburetor.

Disassembling 

Carburetor

„NOTE: On twin carburetor models unless there
is a problem with the safety switches, do not
loosen or remove the screws securing the switch
to the carburetor.

1. Remove the four screws and lock washers secur-

ing the float chamber; then remove the float cham-

ber and gasket.

AH144

„NOTE: The floats should be removed only if
replacement is necessary or the float chamber
requires cleaning with carburetor cleaner.

! CAUTION

Keep MAG-side and PTO-side carburetors identified
for installing purposes.

4

4-5

2. Remove the caps from the float towers; then

remove the floats. Remove the drain plug and O-

ring.

B344

3. Remove the float arm pin; then remove the float

arm.

CM050A

4. Remove the needle valve and the seat. Account for

a washer from the seat.

CM051

5. Remove the main jet and baffle ring; then remove

the main jet extender guide from the needle jet.

Push the needle jet out through the top of the car-

buretor.

AH084

6. Remove the pilot jet.

CM052

7. While counting the rotations for installing pur-

poses, rotate the pilot air screw clockwise until

lightly seated; then remove the pilot air screw and

spring.

CM053A

8. Remove the idle speed screw and spring.

! CAUTION

Use care when removing the float arm pin or the tow-
ers may break. Also, the pin must be removed from
its flattened side.

4-6

CM053B

9. On the 370 cc, remove the throttle cable from the

piston valve; then remove the valve.

AH042

10. On the 570 cc, remove the Phillips-head screw

securing the throttle cable retainer to the piston

valve; then remove the retainer. Account for the jet

needle with E-clip and washer.

AH074A

CM054

„NOTE: Note the position of the E-clip on the jet
needle for assembly purposes.

11. Separate the starter plunger assembly from the

choke cable by compressing the spring and remov-

ing the plunger from the cable; then remove the

spring. Thread the plunger cap off the cable.

Cleaning Carburetor

1. Place all metallic components in a wire basket and

submerge in carburetor cleaner.

2. Soak for approximately 30 minutes; then rinse

with fresh parts-cleaning solvent.

3. Wash all non-metallic components with soap and

water. Rinse thoroughly.

4. Dry all components with compressed air only

making sure all holes, orifices, and channels are

unobstructed.

5. Blow compressed air through all hoses to remove

any obstructions.

Inspecting Carburetor

„NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is
necessary.

1. Inspect the mixing body for cracks, nicks, stripped

threads, and any other imperfections in the casting.

! CAUTION

If an engine problem has been experienced due to
improper gas/air mixture, verify the carburetor jet-
ting and E-clip position with the Specification Chart
and Main Jet Chart on the snowmobile for altitude,
temperature, and type of gasoline.

! CAUTION

DO NOT place any non-metallic components in
parts-cleaning solvent or carburetor cleaner
because damage or deterioration will result.

! WARNING

Always wear safety glasses when drying compo-
nents with compressed air.

! CAUTION

DO NOT use wire or small drill bits to clean carbure-
tor orifices, holes, or channels. Distorted or dam-
aged orifices, holes, or channels can result in poor
carburetor operation.

4

4-7

2. Inspect the piston/throttle valve for cracks, score

marks, or imperfections in the casting.

3. Inspect the condition of the piston valve spring.

4. Inspect the float for perforations or damage.

5. Inspect the gaskets, O-rings, and washers for dis-

tortion, tears, or noticeable damage.

6. When applicable, inspect the tips of the idle speed

screw, jet needle, pilot air screw, needle valve, and

fuel mixture screw for wear, damage, or distortion.

„NOTE: When inspecting the inlet needle,
inspect the side guides and tip for wear. If the
guides show any sign of wear, replace the inlet
needle.

7. Inspect the pilot jet and main jet for obstructions

or damage.

8. Inspect the starter plunger and seat for wear or

damage.

9. Inspect the carburetor mounting flanges for dam-

age and tightness.

Assembling Carburetor

1. Install the idle speed screw and spring.

CM053B

2. Install the pilot air screw and spring. Rotate clock-

wise until lightly seated; then turn counterclock-

wise the same number of turns as noted in

disassembling for an initial setting.

CM053A

3. Install the pilot jet.

CM052

4. Insert the needle jet into position from the top of

the carburetor making sure the groove in the nee-

dle jet is aligned with the pin in the mixing body;

then place the jet extender, baffle ring, and main

jet into position and secure.

AH084

5. In order, place a washer and inlet seat into position

and secure. Install the inlet needle valve.

! CAUTION

An air leak between the carburetor and engine will
cause a lean condition and severe engine damage
will result.

! CAUTION

DO NOT force the pilot air screw when seating. Forc-
ing the screw will result in damage to the carburetor
body.