Snowmobile Arctic Cat (2000 year). Manual - part 51

! WARNING

DO NOT operate the snowmobile when any
component in the throttle system is damaged,
frayed, kinked, worn, or improperly adjusted. If
the snowmobile is operated when the throttle
system is not functioning properly, personal
injury could result.

Adjusting Carburetors

(TM-Style)

The air-intake silencer and boots must be in
position whenever the engine is run. If the
silencer is removed and the engine is run, a lean
condition will result. Therefore, DO NOT run the
engine when the air-intake silencer is removed.

ADJUSTING CHOKE CABLES (Twin)

1. Be sure ignition switch key is in the OFF position

and the brake lever lock is set.

2. Loosen the jam nut securing each choke cable

adjuster.

Fig. 4-84

734-496A

3. Slowly rotate one choke cable adjuster while

checking the choke lever for free-play. As soon as
all free-play has been removed from the end of the
choke lever, stop rotating the adjuster.

4. With free-play removed from the lever, slowly

rotate the adjuster again while checking the choke
lever for free-play. Adjust until 3 mm (1/8 in.)
free-play between front bottom edge of lever and
housing is attained. Securely tighten the jam nut.

Fig. 4-85

0732-848

5. Repeat steps 3 and 4 on the other carburetor.

ADJUSTING CHOKE CABLE (Triple)

1. Be sure ignition switch key is in the OFF position

and the brake lever lock is set.

2. Loosen the jam nuts securing the choke cable to the

bracket at the carburetor.

Fig. 4-86

0734-317

3. Slowly rotate one jam nut while checking the choke

lever for free-play. As soon as all free-play has been
removed from the end of the choke lever, stop
rotating the jam nut.

4. With free-play removed from the lever, slowly

rotate the jam nut again while checking the choke
lever for free-play. Adjust until 3 mm (1/8 in.)
free-play between front bottom edge of lever and
housing is attained. Securely tighten the jam nuts.

SYNCHRONIZING THROTTLE VALVES

1. Open the air-intake silencer cover; then remove the

3 Phillips-head screws securing the cover/tool tray
assembly to the silencer.

2. Tip the cover/tool tray assembly forward and out of

its slots and remove the assembly.

! CAUTION

4-23

3. Using a large flat-blade screwdriver, remove the

resonator tabs from the air-intake silencer slots and
remove the resonator to access the intake bores.

NOTE: The resonator can be removed more easily

by removing the back tabs first.

4. With the throttle in the idle position, select a small

drill bit that will just fit under the cutaway of the
fixed throttle valve.

5. Using the same drill bit, check the clearance under

each adjustable throttle valve cutaway. If clearance
is different from the first carburetor checked, adjust
the throttle valve by loosening the lever ring locking
screw; then using an open-end wrench, rotate each
synchronizing nut in either direction until the
clearance is the same as the first carburetor
checked.

Fig. 4-87

0734-445

6. After synchronization has been attained, hold the

synchronizing nut with the open-end wrench and
tighten the lever ring locking screw.

7. Install the resonator and cover/tool tray assembly.

ADJUSTING FUEL MIXTURE SCREWS

1. While counting the rotations, carefully rotate the

fuel mixture screws clockwise until lightly seated.

Fig. 4-88

734-496B

Fig. 4-89

0734-317

Do not force a fuel mixture screw when rotating
it clockwise; damage to the mixture screw taper
may result.

2. Rotate each fuel mixture screw counterclockwise

the same number of turns as noted in step 1 for an
initial setting.

ADJUSTING ENGINE IDLE SPEED

NOTE: Make engine idle adjustment only after the

engine has reached running temperature. Since the
idle speed screw has not been adjusted, apply slight
throttle pressure to keep the engine running. Allow
engine to warm up for 2-3 minutes.

1. After the engine has been allowed to warm up for

2-3 minutes, fine-tune the idle speed screw until the
tachometer reads 1500 RPM.

2. Test the throttle control lever by compressing and

releasing it several times. The lever must return to
the idle position quickly and completely.

! WARNING

! CAUTION

4-24

Throttle Cable

(VM-Style)

REMOVING

Fig. 4-90

734-533A

Fig. 4-91

734-609A

Fig. 4-92

733-420B

1. Loosen the throttle cable adjuster jam nuts.

2. Remove the mixing body tops.

3. Remove the throttle cables from the piston valves.

4. Remove the throttle cables from the mixing body

tops.

5. Remove the handlebar pad and console.

6. Remove the cable ties securing the throttle cable.

7. Remove the throttle cable end from the throttle

lever.

8. Remove the retaining ring securing the cable to the

throttle switch assembly; then remove the cable
from the throttle switch assembly.

9. On twin and triple carburetor models, it may be

necessary to remove the PTO-side carburetor.

10. Remove the E-ring securing the oil-injection cable

to the control arm. Account for a washer.

11. Loosen the jam nut securing the adjustment cable;

then remove the cable from the oil-injection pump.

INSTALLING

1. Route the throttle cable from the throttle switch

assembly to the carburetors and oil-injection pump;
avoid any sharp bends or moving parts.

2. Install the oil-injection adjustment cable on the

oil-injection pump; secure with the jam nuts.

3. Install the oil-injection cable on the control arm;

secure with a washer and E-ring.

4. Install the PTO-side carburetor if removed.

5. Install the throttle cable into the throttle switch

assembly. Secure with a retaining ring.

6. Install the throttle cable end on the throttle lever.

7. Secure the throttle cable to the steering post with

cable ties.

8. Install the handlebar pad and console.

9. Attach the throttle cable to each throttle valve. The

valve must seat in the groove of the throttle cable
end; then thread the throttle cable into each mixing
body top.

10. Install each piston valve and mixing body top on the

carburetor(s). Tighten securely.

11. Adjust the carburetor(s) (see appropriate Adjusting

Carburetors in this sub-section).

KEY

1. Retaining Ring
2. Throttle Cable
3. Cable Tie
4. E-Ring
5. Washer
6. Nut

KEY

1. E-Ring
2. Throttle Cable
3. Cable Tie
4. Retaining Ring
5. Washer
6. Nut

KEY

1. E-Ring
2. Cable Tie
3. Washer
4. Retaining Ring
5. Nut
6. Throttle Cable

4-25

Compress the throttle control lever to ensure
free movement. If the throttle cable sticks or
binds, correct the problem before starting the
engine.

12. Synchronize the oil-injection pump (see Related

Items in this section).

Throttle Cable

(TM-Style)

Fig. 4-93

734-240A

REMOVING

1. Loosen the throttle cable adjuster jam nuts at the

bracket.

2. Remove the throttle cable from the pulley on the

throttle lever shaft.

3. Remove the handlebar pad and console.

4. Remove the throttle cable from the throttle lever.

5. Remove the retaining ring securing the cable to the

throttle switch assembly; then remove the cable
from the throttle switch assembly.

6. Open the belt guard; then remove the drive belt.

7. Remove the E-ring securing the oil-injection cable

to the control arm. Account for a washer.

8. Loosen the jam nut securing the adjustment cable;

then remove the cable from the oil-injection pump.

INSTALLING

1. Install the oil-injection adjustment cable on the

oil-injection pump; secure with the jam nuts.

2. Install the oil-injection cable on the control arm;

secure with a washer and E-ring.

3. Route the throttle cable from the carburetor to the

throttle switch assembly. Secure with a retaining
ring.

Avoid any sharp bends and hot or moving
components or damage may occur.

4. Install the throttle cable on the throttle lever.

5. Install the handlebar pad and console.

6. Install the throttle cable into the throttle lever shaft

pulley.

7. Install the throttle cable into the bracket; then adjust

the jam nuts to attain no free-play between the
throttle lever and the control housing.

NOTE: There must be no free-play between the

lever and the control housing.

Compress the throttle control lever to ensure
free movement. If the throttle cable sticks or
binds, correct the problem before starting the
engine.

8. Synchronize the oil-injection pump (see Related

Items in this section).

9. Install the drive belt; then close and secure the belt

guard.

Choke Cable

(VM-Style)

REMOVING

1. Bend down the lock tabs locking each brass choke

cable housing on each carburetor.

2. Using a 12-mm wrench, remove each brass choke

cable housing from each carburetor. Account for the
lock tab washers.

3. Remove each brass plunger and spring from the

cable end; then remove each brass choke cable
housing.

4. Remove the screws securing the console.

5. Position the choke lever in the middle-choke

position; then remove the knurled nut securing the
choke lever housing to the console.

! CAUTION

KEY

1. E-Ring
2. Cable Tie
3. Washer
4. Retaining Ring
5. Nut
6. Throttle Cable

! CAUTION

4-26

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