Snowmobile Arctic Cat (2007 year). Instruction - part 44

 

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Snowmobile Arctic Cat (2007 year). Instruction - part 44

 

 

4-1

4

SECTION 4 — FUEL SYSTEMS

TABLE OF

CONTENTS

Fuel System ............................................................ 4-2
Carburetor Specifications (120 cc) .......................... 4-2
Pre-Maintenance Checks (120 cc) .......................... 4-2
Carburetor Schematic (120 cc) ............................... 4-2
Removing Carburetor (120 cc) ................................ 4-3
Disassembling Carburetor (120 cc)......................... 4-3
Cleaning Carburetor (120 cc) .................................. 4-5
Inspecting Carburetor (120 cc)................................ 4-5
Assembling Carburetor (120 cc).............................. 4-5
Installing Carburetor (120 cc) .................................. 4-6
Adjusting Carburetor (120 cc) ................................. 4-8
Throttle Cable (120 cc)............................................ 4-9
Throttle Body Assembly (660 cc) .......................... 4-10
Throttle Body Assembly (1100 cc Z1) ................... 4-13
Throttle Position Sensor (660 cc/1100 cc Z1) ....... 4-16
Fuel Filter (660 cc) ................................................ 4-16
Fuel Filter (1100 cc Z1) ......................................... 4-17
Fuel Pump (660 cc) ............................................... 4-18
Fuel Pump (1100 cc Z1)........................................ 4-19
Troubleshooting Fuel System 

(660 cc/1100 cc Z1) ........................................... 4-21

Air-Intake Silencer (120 cc) ................................... 4-21
Gas Tank/Seat Assembly ...................................... 4-21

4-2

Fuel System

This sub-section has been organized for servicing

4-stroke fuel systems; however, some components

may vary from model to model. The technician

should use discretion and sound judgment when

removing/disassembling 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: For testing procedures for specific          4-
stroke EFI fuel system components, refer to the
Arctic Cat Diagnostic System Manual (p/n 2256-
974) or to the Laptop Diagnostic Tool (p/n 0744-
048).

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

Carburetor 

Specifications 

(120 cc)

Pre-Maintenance 

Checks 

(120 cc)

Before troubleshooting the fuel system, several sim-

ple 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 posi-

tion; then remove the in-line fuel filter. If the fil-

ter is dirty, replace the filter.

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

filter is directed toward the fuel pump.

728-272B

4. Check the impulse hose for cracks or any possi-

ble air leaks. The hose must fit tightly at both

ends. If loose or cracked, replace the hose.

5. Check the gas tank vent hose for kinks or

obstructions; remove any obstructions.

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

Carburetor

Schematic 

(120 cc)

0739-450

MAIN JET

MAIN AIR JET

PILOT OUTLET

77.5

1.5

1.0

PILOT JET

THROTTLE VALVE

PILOT SCREW

(TURNS OUT)

42.5

130

1

KEY

1. Carburetor Assy

2. Drain Plug

3. Gasket

4. Drain Screw

5. Gasket

6. Float Chamber

7. Gasket

8. Ring

9. Float

10. Float Pin

11. Main Jet

12. Nozzle

13. Spring

14. Needle Jet

15. Screw

16. Pilot Jet

17. Pilot Air Screw

18. Spring

19. Idle Speed Screw

20. Clamp

21. Hose

4

Removing Carburetor

(120 cc)

1. Remove the wing nut securing the air cleaner

end cap to the air cleaner housing.

2. Remove the cap screw and flanged nuts securing

the air cleaner housing to the carburetor and

engine.

A002

GF314D

3. Remove the air breather hose from the air

cleaner housing; then remove the air cleaner

housing from the carburetor. Account for the

gasket.

A001

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

position.

5. Remove the fuel supply hose.

6. Disconnect the rod and spring from the carbure-

tor.

GF317D

7. Slide the carburetor off the mounting studs.

Account for a gasket, insulator block, and a gas-

ket.

GF318D

Disassembling 

Carburetor

 (120 cc)

1. Rotate the high-speed adjuster screw clockwise

while noting the number of rotations (for assem-

bling purposes) until lightly seated; then remove

the high-speed adjuster screw.

GF319D

4-4

2. Remove the pilot jet.

GF320D

3. Remove the drain bolt securing the float cham-

ber to the carburetor.

GF321D

4. Remove the splash ring from the carburetor

tower.

GF322D

5. Remove the pin securing the float to the carbu-

retor body; then remove the float and needle

valve assembly.

GF323D

GF324D

6. Remove the main jet and the nozzle from the

carburetor tower.

GF325D

GF326D

 

 

 

 

 

 

 

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