Fuel System; Carburetor Specifications (120 Cc); Pre-Maintenance Checks (120 Cc); Carburetor Schematic (120 Cc) - Arctic Cat 660 cc Service Manual

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
2002-2003 Arctic Cat Diagnostic System Manual
(p/n 2256-974).
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
MAIN JET MAIN AIR JET
77.5
PILOT JET THROTTLE VALVE
42.5
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.
3. Install a new filter making sure the arrow on the
filter is directed toward the fuel pump.
4-2
(120 cc)
PILOT OUTLET
1.5 1.0
PILOT SCREW
(TURNS OUT)
130 1
(120 cc)
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4. 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.
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
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. Pilot Air Screw
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728-272B
(120 cc)
12. Spring
13. Pilot Jet
14. Idle Speed Screw
15. Ring
16. Float Chamber
17. Drain Screw
18. Gasket
19. Hose
20. Clamp
21. Screw
0735-414
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