Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 57

 

  Index      Snowmobiles / ATV     Snowmobile Arctic Cat 2-Stroke - instruction 2007 year

 

Search            copyright infringement  

 

 

 

 

 

 

 

 

 

Content   ..  55  56  57  58   ..

 

 

Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 57

 

 

4-2

Fuel System

(Carbureted)

This sub-section has been organized for servicing car-

bureted fuel systems; however, some components may

vary from model to model. The technician should use

discretion and sound judgment when removing/ disas-

sembling and assembling/installing components.

Whenever any maintenance or inspection is made on

the fuel system in which fuel leakage may occur, there

should be no welding, smoking, or open flames in the

area.

„NOTE: Some illustrations and photographs used
in this sub-section are used for clarity purposes only
and are not designed to depict actual conditions.

Fuel System

(Carbureted)

Table of Contents

Carburetor Specifications ........................................ 4-3
Pre-Maintenance Checks ........................................ 4-3
Changing Main Jet(s) .............................................. 4-3
Carburetor Schematics............................................ 4-4
Removing Carburetor .............................................. 4-5
Disassembling Carburetor....................................... 4-5
Cleaning Carburetor ................................................ 4-7
Inspecting Carburetor.............................................. 4-8
Assembling Carburetor............................................ 4-8
Installing Carburetor .............................................. 4-10
Adjusting Carburetor(s) ......................................... 4-11
Throttle Cable........................................................ 4-14
Choke Cable.......................................................... 4-15
Mikuni Tuning Components ................................... 4-16
Major Tuning Components .................................... 4-18
Troubleshooting Fuel System ................................ 4-19

4

4-3

Carburetor 

Specifications

„NOTE: The above specifications are production
settings. For high altitude jetting and settings,
refer to the jet chart beneath the snowmobile hood
or to the current High Altitude Guidebook.

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 accordingly.

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

filter is directed toward the fuel pump.

728-272B

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 con-

tainer.

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)

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 car-

buretor 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.

MODEL

TYPE

MAIN 

JET

NEEDLE JET

JET 

NEEDLE

PILOT 

JET

CUT-AWAY

PILOT AIR 

SCREW 

(TURNS OUT)

FLOAT HEIGHT

SETTING

(mm)

Bearcat 570 (2)

220

P-4M (961)

CE25-3

40

3.0

1 1/2

22-24

VM-34

Panther 370 (1)

250

P-5M (953)

6DH7-3

40

2.5

1

22-24

VM-32

Panther 570 (2)

220

P-4M (961)

CE25-3

40

3.0

1 1/2

22-24

VM-34

Z 370

(1)

250

P-5M (953)

6DH7-3

40

2.5

1

22-24

VM-32

Z 570

(2)

220

P-4M (961)

CE25-3

40

3.0

1 1/2

22-24

VM-34

4-4

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

securely.

0728-054

5. Install and secure each carburetor.

Carburetor Schematics

„NOTE: Some components may vary from model
to model. The technician should use discretion
and sound judgment.

0740-658

0738-474

! CAUTION

When installing the throttle bodies/carburetors,
make sure the gasline hoses are properly routed to
avoid premature wear and/or contact with exhaust
components.

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. E-Clip Washer

19. Jet Needle

20. Piston Valve

21. Needle Jet

22. Plate

23. Screw w/Spring 

Washer

24. Washer

25. Needle Valve 

Assy

26. Float Pin

27. Float Arm

28. Cap

29. Float

30. Gasket

31. Float Chamber

32. Hose Plate

33. Vent Hose

34. Screw w/Spring 

Washer

35. O-Ring

36. Drain Plug

37. Cap

38. Washer

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

VM-34

4

4-5

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.

 

 

 

 

 

 

 

Content   ..  55  56  57  58   ..