Carburetor - Arctic Cat ZR 120 2021 Operator's Manual

Carburetor

The carburetor has been calibrated for
average riding conditions; however, alti-
tude, temperature, and general wear may
necessitate certain carburetor adjust-
ments. Since carburetor adjustments criti-
cally affect engine performance, Arctic
Cat recommends that any changes in
internal carburetor calibration be made
by an authorized Arctic Cat Snowmobile
dealer; however, three external adjust-
ments can be made on the carburetor.
These are the throttle stop screw, idle fuel
adjuster screw, and throttle cable.
Throttle Stop Screw
This screw controls the seating position of
the throttle valve which in turn determines
the proper idle speed. Rotate the screw clock-
wise to increase engine idle speed and coun-
terclockwise to decrease engine idle speed.
Idle Fuel Adjuster Screw
This adjuster screw determines the fuel/
air mixture for idling. To adjust, use the
following procedure:
1. Start the engine and allow to run at
half throttle 5-10 minutes to warm up.
2. Place the throttle in the idle position;
then rotate the idle fuel adjuster
screw/cap in or out within the
adjustment range to obtain smooth
low speed performance.
Throttle Cable
The correct throttle cable adjustment is
when (with the engine OFF) the carbure-
tor throttle is completely open (against its
limit) while the throttle lever lightly con-
tacts the handlebar grip. The throttle arm
on the carburetor should also contact the
speed control screw when the throttle
lever is released.
To adjust the throttle cable, use the fol-
lowing procedure:
Do not attempt to adjust the throttle
cable with the engine running. Per-
sonal injury could result.
1. Loosen the throttle cable jam nuts.
2. Pull all slack from the throttle cable
wire and exert slight tension on the
wire.
3. Tighten the throttle cable jam nuts.
0744-921
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.
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 control screw clockwise. DO
NOT EVER INCREASE THE MAXI-
MUM SPEED BEYOND THE ORIGI-
NAL
MAXIMUM!
! WARNING
! WARNING
8 MPH (12.8
0744-922
0744-949
KM/H)
15