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Snowmobile Arctic Cat (2004 year). Manual - part 42

4-3

Carburetor

Specifications

*See Main Jet Chart **Initially set up at the factory for operation between 6000-9000 feet

MODEL

ALTITUDE

TYPE

MAIN JET NEEDLE JET

JET NEEDLE

PILOT JET CUTAWAY

PILOT AIR

SCREW

(TURNS OUT)

FUEL MIXTURE

SCREW

(TURNS OUT)

Bearcat 570

0-5000

250

P-4 (480)

6DF7-3

2.5

1 3/4

5-9000

VM-34

6DF7-2

N/A

9-Over

(2)

6DF7-1

Firecat 500

0-5000

360

Fixed

9EH06-3

3.0

1 5/8

5-9000

TM-38

9EH06-2

1 1/2

9-Over

(2)

9EH06-1

2 1/2

Firecat 600

0-5000

460

Fixed

9EFH9-4

3.0

1 1/2

5-9000

TM-40

9EFH9-2

9-Over

(2)

9EFH9-1

1 3/4

Firecat 700

0-5000

510-N

Fixed

9EJI-4

3.0

1 1/2

5-9000

TM-40

9EJI-3

1 1/2

9-Over

(2)

9EJI-2

3/4

Pantera 550

0-5000

340

P-2 (480)

9DH8-3

3.0

5-9000

VM-38

P-0 (480)

N/A

9-Over

(2)

Panther 370

0-5000

250

P-6 (159)

6DH7-3

2.5

5-9000

VM-32

N/A

9-Over

(2)

Panther 570

0-5000

250

P-4 (480)

6DF7-3

2.5

1 3/4

5-9000

VM-34

6DF7-2

N/A

9-Over

(2)

6DF7-1

Sabercat 500

0-5000

290

P-4 (480)

6DF7-3

2.5

5-9000

VM-34

6DF7-2

1/2

N/A

9-Over

(2)

Sabercat 600

0-5000

460

Fixed

9EFH9-4

3.0

1 1/2

5-9000

TM-40

9EFH9-2

9-Over

(2)

9EFH9-1

1 3/4

Z 370

0-5000

250

P-6 (159)

6DH7-3

2.5

5-9000

VM-32

N/A

9-Over

(1)

Z 440

0-5000

280

P-4 (480)

6DH7-3

2.5

5-9000

VM-32

N/A

9-Over

(2)

Z 570

0-5000

250

P-4 (480)

6DF7-3

2.5

1 3/4

5-9000

VM-34

6DF7-2

N/A

9-Over

(2)

6DF7-1

ZR 900

0-5000

430

Fixed

9DFH9-4

3.0

1 1/2

5-9000

TM-40

9DFH9-3

1 3/4

9-Over

(2)

9DFH9-2

Mountain Cat 570**

0-3000

6DF7-3

3-6000

VM-34

6-9000

(2)

200

P-4 (480)

6DF7-2

2.5

1 3/4

N/A

9-Over

Mountain Cat 900**

0-3000

9DFH9-4

3-6000

TM-40

6-9000

(2)

360

Fixed

9DFH2-3

3.0

1 3/4

1 1/2

9-Over

9DFH2-2

King Cat 900**

0-3000

9DFH9-4

3-6000

TM-40

6-9000

(2)

360

Fixed

9DFH2-3

3.0

1 1/2

9-Over

9DFH2-2

4-4

Pre-Maintenance

Checks

Before troubleshooting the fuel system, several simple
checks should be performed. Many times what appears
to be a serious problem is only a minor one.

1. Make sure the gas tank shut-off valve was in the

OPEN position.

2. Turn the shut-off valve to the CLOSED position;

then remove the in-line fuel filter. If the filter is
dirty, replace the filter.

NOTE: Determine which style in-line fuel filter is

being replaced and remove and install accord-
ingly.

3. Install a new filter making sure the arrow on the

filter is directed toward the fuel pump.

728-272B

726-065A

4. Check the hoses to ensure that all are correctly

connected; then check for cracks. If any cracks are
evident in the hoses, replace them making sure
none are against any hot or moving parts. Hoses
must fit tightly. If hoses do not fit tightly, cut 6
mm (1/4 in.) from the end and install.

5. Check the impulse hose for cracks or any possible

air leaks. The hose must fit tightly at both ends. If
loose or cracked, replace the hose.

6. Check each carburetor vent hose for kinks or

obstructions; remove any obstructions.

7. Check each carburetor float chamber drain hose

for water or debris. If seen, clean by removing the
plug and draining the drain hose into a small
container.

8. Check the gas tank vent hose and fuel hose for

obstructions; remove any obstructions.

9. Turn the shut-off valve to the OPEN position.

Changing Main Jet(s)

(VM-Style)

The carburetor main jet(s) must be changed in con-
junction with the changes in temperature, altitude, and
type of gasoline being used.

1. Loosen each carburetor flange clamp and remove

each carburetor from the intake flange and boot.

2. Remove the drain plug and O-ring from each

carburetor float chamber and drain the gas into
either a small container or an absorbent towel.

3. Using the Main Jet Wrench (p/n 0644-065), thread

the main jet out of each carburetor. Account for
the baffle ring. Install the new main jet with baffle
ring and tighten securely.

4. Install the drain plug and O-ring; then tighten

securely.

0728-054

5. Install and secure each carburetor.

Changing Main Jets

(Standard TM-Style)

The carburetor main jets must be changed in conjunc-
tion with the changes in temperature, altitude, and type
of gasoline being used.

1. Remove the machine screw and washer securing

the mounting plate (for the ignition coil and fuel
pump) to the air-intake silencer.

4-5

AN613D

2. Remove the screws securing the air-intake

silencer; then move the silencer forward and out of
the engine compartment.

3. Loosen the carburetor flange clamps and slide the

carburetors out of the intake flanges. Tilt the
carburetors forward to access the main jets.

4. Remove the drain plug (with O-ring) from each

carburetor float chamber and drain the gas into
either a small container or an absorbent towel.

5. Using the Main Jet Wrench (p/n 0644-065), thread

the main jet out of each carburetor. Account for
the washer. Install the new main jet and washer
and tighten securely.

0734-280

6. Install the drain plug with O-ring; then tighten

securely.

7. Push the carburetors back into position and into

the intake flanges; then tighten the flange clamps.

8. Place the air-intake silencer into position in the

engine compartment making sure the carburetors
are properly positioned in the boot and secure with
the screws.

9. Place the ignition coil/fuel pump mounting plate

into position on the air-intake silencer and secure
with the machine screw and washer.

Changing Main Jets

(“Laydown” Engine TM-Style)

The carburetor main jets must be changed in conjunc-
tion with the changes in temperature, altitude, and type
of gasoline being used.

1. Tip the snowmobile onto its left side; then using a

torx-bit, remove the screws securing the center
belly pan (skid plate) to the front end.

NOTE: A piece of cardboard should be used to

protect the finish on the hood and belly pan.

2. Using a swivel adapter and a 17 mm socket,

remove the drain plugs from the float chambers.

3. Using the Main Jet Wrench (p/n 0644-065), thread

the main jet out of each carburetor. Account for
the washer. Install the new main jet and washer
and tighten securely.

0734-280

4. Install the drain plug with O-ring; then tighten

securely.

5. Place the center belly pan (skid plate) into position

on the front end; then secure with the screws.

NOTE: If the snowmobile has been tipped on its

side for an extended period of time, inspect the oil-
line hose for any signs of air bubbles. If air bub-
bles are visible, see Related Items sub-section for
bleeding procedure.

4-6

Carburetor

Schematics

NOTE: Some components may vary from model

to model. The technician should use discretion
and sound judgment.

0736-506

0738-474

0738-549

KEY

1. Mixing Body

Assy

2. Float Chamber
3. Plate
4. Piston Valve
5. Jet Needle
6. Main Jet
7. Baffle Ring
8. Needle Jet
9. E-Clip

10. Float
11. Cap
12. Screw w/Spring

Washer

13. Mixing Body

Top

14. Pilot Air Screw

15. Spring
16. Spring
17. Idle Speed

Screw

18. Drain Plug
19. Washer
20. Float Pin
21. Needle Valve

Assy

22. Float Arm
23. Piston Valve

Spring

24. Pilot Jet
25. Gasket
26. Starter Plunger

Spring

27. Starter Plunger

Cap

28. Hose Plate
29. Starter Plunger
30. Screw w/Spring

Washer

31. Plate
32. O-Ring
33. Vent Hose

VM-32

KEY

1. Mixing Body

Assy

2. Starter Plunger

Cap

3. Starter Plunger

Spring

4. Starter Plunger
5. Spring
6. Idle Speed

Screw

7. Spring
8. Pilot Air Screw
9. Pilot Jet

10. Baffle Ring
11. Main Jet
12. Mixing Body

Top

13. Piston Valve

Spring

14. Plate
15. Magnet Block
16. Screw w/

Washer

17. E-Clip
18. Washer
19. Jet Needle
20. Piston Valve
21. Needle Jet
22. Self-Tapping

Screw

23. Magnetic

Switch

24. Plate
25. Screw w/Spring

Washer

26. Washer
27. Needle Valve

Assy

28. Float Pin
29. Float Arm
30. Cap
31. Float
32. Gasket
33. Float Chamber
34. Plate
35. Hose
36. Screw w/Spring

Washer

37. O-Ring
38. Drain Screw
39. Cap
40. Washer (570 cc)

VM-34

VM-38

KEY

1. Mixing Body

Assy

2. Starter Plunger

Cap

3. Washer
4. Spring
5. Starter Plunger
6. Idle Speed

Screw

7. Spring
8. Spring
9. Pilot Air Screw

10. Pilot Jet
11. Screw Guide
12. Baffle Ring
13. Main Jet

14. Mixing Body

Top

15. Piston Valve

Spring

16. Plate
17. Magnet Block
18. Machine Screw
19. E-Clip
20. E-Clip Washer
21. Jet Needle
22. Piston Valve
23. Needle Jet
24. Screw
25. Magnetic Switch
26. Machine Screw
27. Washer
28. Washer

29. Washer
30. Needle Valve

Assy

31. Float Arm Pin
32. Float Arm
33. Cap
34. Float
35. Gasket
36. Float Chamber
37. Plate
38. Air Vent Tube
39. Screw w/Spring

Washer

40. O-Ring
41. Drain Plug

Content .. 40 41 42 43 ..