Arctic Cat Sno Pro 120 2011, Service Manual

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4-2
Fuel Systems
These sub-sections have been organized for servicing
carbureted and fuel-injected fuel systems; however, some
components may vary from model to model. The techni-
cian should use discretion and sound judgment when
removing/ disassembling and assembling/installing com-
ponents.
Whenever any maintenance or inspection is made on the
fuel system where fuel leakage may occur, there should
be no welding, smoking, or open flames in the area.

NOTE: Critical torque specifications can be found in
Section 1 of this manual.

NOTE: Some illustrations and photographs used in
this section are used for clarity purposes only and
are not designed to depict actual conditions.
SPECIAL TOOLS
A number of special tools must be available to the techni-
cian when servicing the fuel systems.

NOTE: Special tools are available from the Arctic
Cat Service Parts Department.
Fuel System (Carbureted)
Table of Contents
Pre-Maintenance Checks........................................ 4-2
Changing Main Jets ................................................ 4-2
Carburetor ............................................................... 4-3
Throttle Cable........................................................ 4-11
Choke Cable ......................................................... 4-11
Troubleshooting Fuel System................................ 4-12
Pre-Maintenance Checks
1. 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.
2. Install a new filter making sure the arrow on the filter
is directed toward the fuel pump.
728-272B
3. Check the hoses to ensure that all are correctly con-
nected; then check for cracks. If any cracks are evi-
dent 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.
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 each carburetor vent hose for kinks or
obstructions; remove any obstructions.
6. 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.
7. Check the gas tank vent hose and fuel hose for
obstructions; remove any obstructions.
Changing Main Jets
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 carbu-
retor float chamber and drain the gas into either a
small container or an absorbent towel.
3. Using Main Jet Wrench, 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.
Description p/n
Arctic Cat Diagnostic System Manual
2256-974
Fuel Pump Socket Wrench
0644-364
EFI Analyzer
0744-049
EFI Analyzer Update Kit
0744-047
EFI Diagnostic System Manual
2257-850
EFI Diagnostic System Manual (Instructions)
2259-020
Fluke Model 77 Multimeter
0644-559
Fuel Hose Clamp Tool
0644-545
Fuel Pressure Test Kit
0644-493
Laptop Diagnostic Test Kit
0744-050
Laptop Diagnostic Tool
0744-048
Main Jet Wrench
0644-065
Oil Injection Usage Tool
0644-007
Throttle Cable Removal Tool
1639-963
CAUTION
When installing the carburetors, make sure the gasline
hoses are properly routed to avoid premature wear
and/or contact with exhaust components.
Manual
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