Snowmobile Arctic Cat (2002 year). Instruction - part 52

 

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Snowmobile Arctic Cat (2002 year). Instruction - part 52

 

 

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 condi-
tions.

Fuel System

(Carbureted)

Table of Contents

Pre-Maintenance Checks........................................ 4-2
Changing Main Jet(s)(VM-Style) ............................. 4-3
Changing Main Jets (TM-Style) .............................. 4-4
Carburetor Schematics ........................................... 4-4
Removing Carburetor (BV-Style)............................. 4-6
Removing Carburetor (VM-Style)............................ 4-7
Removing Carburetors (TM-Style) .......................... 4-8
Disassembling Carburetor (BV-Style)...................... 4-8
Disassembling Carburetor (VM-Style)................... 4-10
Disassembling Carburetors (TM-Style) ................. 4-12
Cleaning Carburetor.............................................. 4-14
Inspecting Carburetor............................................ 4-15
Assembling Carburetor (BV-Style) ........................ 4-15
Assembling Carburetor (VM-Style) ....................... 4-16
Assembling Carburetors (TM-Style) ...................... 4-18
Installing Carburetor (BV-Style)............................. 4-20
Installing Carburetor (VM-Style)............................ 4-21
Installing Carburetors (TM-Style) .......................... 4-22
Adjusting Carburetor (BV-Style) ............................ 4-23
Adjusting Carburetor(s) (VM-Style) ....................... 4-24
Adjusting Carburetors (TM-Style).......................... 4-28
Throttle Cable (BV-Style) ...................................... 4-29
Throttle Cable (VM-Style)...................................... 4-31
Throttle Cable (TM-Style)...................................... 4-32
Choke Cable (VM-Style) ....................................... 4-33
Choke Cable (TM-Style)........................................ 4-34
2002 Carburetor Specifications (Production) ........ 4-35
Mikuni Tuning Components................................... 4-36
Major Tuning Components .................................... 4-37
Troubleshooting Fuel System (Carbureted) .......... 4-38

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.

735-390A

726-065A

4-3

4

728-272A

725-067A

734-292A

734-292B

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.

4-4

Changing Main Jets

(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.

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.

Carburetor

Schematics

0735-414

KEY

1. Carburetor Assy
2. Gasket
3. Float
4. Gasket
5. Drain Plug
6. Main Jet
7. Spring
8. Float Pin
9. Needle Jet

10. Nozzle
11. Adjuster Screw

12. Spring
13. Pilot Jet
14. Screw
15. Ring
16. Float Chamber
17. Drain Screw
18. Gasket
19. Hose
20. Clamp
21. Screw

BV-18

 

 

 

 

 

 

 

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