Snowmobile Arctic Cat (2007 year). Instruction - part 45

 

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Snowmobile Arctic Cat (2007 year). Instruction - part 45

 

 

4-5

4

Cleaning Carburetor 

(120 

cc)

1. Place all metallic components in a wire basket

and submerge in carburetor cleaner.

2. Soak for approximately 30 minutes; then rinse

with fresh parts-cleaning solvent.

3. Wash all non-metallic components with soap

and water. Rinse thoroughly.

4. Dry all components with compressed air only

making sure all holes, orifices, and channels are

unobstructed.

5. Blow compressed air through all hoses to

remove any obstructions.

Inspecting Carburetor 

(120 cc)

„ NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is
necessary.

1. Inspect the mixing body for cracks, nicks,

stripped threads, and any other imperfections in

the casting.

2. Inspect the float for perforations or damage.

3. Inspect the gaskets for distortion, tears, or

noticeable damage.

4. When applicable, inspect the idle speed screw,

needle jet, pilot air screw, and pilot jet for wear,

damage, or distortion.

5. Inspect the main jet for obstructions or damage.

6. Inspect the carburetor mounting flange for dam-

age and tightness.

7. Place the carburetor insulator on a surface plate

covered with #400 grit wet-or-dry sandpaper.

Move the insulator over the surface plate using a

figure eight motion. The motion should produce

an even wear pattern over the entire sealing

area.

A739

8. Inspect the condition of the throttle return

spring.

Assembling Carburetor

(120 cc)

1. Install the nozzle and main jet into the carbure-

tor tower.

GF326D

! CAUTION

DO NOT place any non-metallic components in
parts-cleaning solvent or carburetor cleaner
because damage or deterioration will result.

! WARNING

Always wear safety glasses when drying compo-
nents with compressed air.

! CAUTION

DO NOT use wire or small drill bits to clean carbure-
tor orifices, holes, or channels. Distorted or dam-
aged orifices, holes, or channels can result in poor
carburetor operation.

! CAUTION

An air leak between the carburetor and engine will
cause a lean condition and severe engine damage
will result.

! CAUTION

Water or parts-cleaning solvent must be used in
conjunction with the wet-or-dry sandpaper or dam-
age to the sealing surfaces may result.

4-6

GF325D

2. Place the needle valve assembly and the float

into position and secure to the carburetor body

with the pin.

GF324D

GF323D

3. Install the splash ring onto the carburetor tower.

GF322D

4. Secure the float chamber to the carburetor with

the drain bolt.

GF321D

5. Install the pilot jet.

GF320D

6. Install the high-speed adjuster screw and rotate

the screw clockwise until lightly seated; then

rotate the screw counterclockwise the proper

number of rotations as noted during disassem-

bling.

GF319

Installing Carburetor

(120 cc)

1. Place the carburetor into position on the mount-

ing studs accounting for a gasket, insulator

block, and a gasket.

4-7

4

GF318D

2. Connect the rod and spring to the carburetor.

GF317D

3. Install the fuel supply hose on the carburetor.

4. Place the gasket and air cleaner housing into

position on the carburetor; then install the air

breather hose.

GF316D

A001

5. Place the air cleaner housing and carburetor on

the engine and secure with the flanged nuts and

cap screw.

GF314D

A002

6. Secure the air cleaner end cap to the air cleaner

with the wing nut.

7. Turn the gas tank shut-off valve to the OPEN

position and check the fuel system for leakage.

8. Adjust the carburetor (see Adjusting Carburetor

in this section).

4-8

Adjusting

Carburetor

(120 cc)

The carburetor has been calibrated for average

riding conditions; however, altitude, temperature,

and general wear may necessitate certain carburetor

adjustments. Since carburetor adjustments critically

affect engine performance, three external adjust-

ments can be made on the carburetor. These are the

idle speed screw, pilot air screw, and throttle cable.

0735-464

IDLE SPEED SCREW

The idle speed screw controls the seating position of

the throttle valve which in turn determines the

proper idle speed. Rotate the screw clockwise to

increase engine idle speed and counterclockwise to

decrease engine idle speed.

PILOT AIR SCREW

The pilot air screw determines the fuel/air mixture

for idling. To adjust the pilot air screw, use the fol-

lowing procedure:

1. Carefully rotate the pilot air screw clockwise

until a light “seating resistance” is felt.

2. Rotate the pilot air screw counterclockwise 1

turn.

3. Start the engine and “fine tune” the pilot air

screw until the engine idles smoothly.

THROTTLE CABLE

The correct throttle cable adjustment is when (with

the engine OFF) the carburetor throttle is com-

pletely open (against its limit) while the throttle

lever lightly contacts the handlebar grip. The throt-

tle arm on the carburetor should also contact the

speed control screw when the throttle lever is

released.

To adjust the throttle cable, use the following proce-

dure:

1. Loosen the throttle cable wire binding screw.

0735-459

2. Pull all slack from the throttle cable wire and

exert slight tension on the wire.

3. Tighten the throttle cable wire binding screw.

SPEED CONTROL SCREW

The maximum speed of the snowmobile can be

reduced by adjusting the speed control screw.

To reduce the maximum speed, rotate the speed con-

trol screw clockwise. DO NOT EVER INCREASE

THE MAXIMUM SPEED BEYOND THE ORIGI-

NAL 8 MPH MAXIMUM.

! CAUTION

DO NOT force the pilot air screw when seating; dam-
age to the pilot air screw will result.

! WARNING

Do not attempt to adjust the throttle cable with the
engine running. Personal injury could result.

! WARNING

DO NOT operate the snowmobile when any compo-
nent in the throttle system is damaged, frayed,
kinked, worn, or improperly adjusted. If the snowmo-
bile is operated when the throttle system is not func-
tioning properly, personal injury could result.

 

 

 

 

 

 

 

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