Snowmobile Polaris Widetrak LX (2015 year). Manual - part 13

54

OPERATION

Carburetion

Jetting Guidelines

Changes in altitude and temperature affect air density, which is the 
amount of oxygen available for combustion. In low elevations and cold 
temperatures, the air has more oxygen. In higher elevations and higher 
temperatures, the air is less dense.

All carburetors have been pre-set at the factory to the settings indicated 
by the shaded cells of the jetting chart on page 105. Carburetors must be 
re-calibrated if the snowmobile is operated outside this production 
temperature and/or altitude range. The main jet installed in production is 
not correct for all altitudes and/or temperatures. The number stamped in 
the end of the main jet indicates the jet size that was installed at the time 
of manufacture.

NOTICE: Using non-recommended jets and/or needles can result in shorter 

engine life, lower fuel economy, increased emissions and poor 
performance and drivability. Always use POLARIS-recommended jets 
and needles.

It’s the owner’s responsibility to ensure that the correct jets are installed 
in the snowmobile for a geographical area. Be very careful when jetting 
down in warm weather. As the weather turns colder it will be necessary 
to re-jet upward to prevent engine damage. When selecting the proper 
main jet always use the lowest elevation and temperature that is likely to 
be encountered.

55

OPERATION

Engine Stop Switch

Push down on the engine 
stop switch to stop the 
engine in an emergency. 
This will ground out the 
ignition and bring the 
engine to a quick stop. 
To restart the engine, the 
switch must be pulled up 
to the ON position.

Throttle Safety Switch

The throttle safety switch is designed to stop the engine whenever all 
pressure is removed from the throttle lever and the throttle cable or 
valves do not return to the normal closed position. Test the throttle 
safety switch system daily before operation.

WARNING! Operating the snowmobile with a faulty throttle safety switch can 
result in serious injury or death in the event of an accident. If the throttle safety 
switch does not shut off the engine during a carburetor/throttle system 
malfunction, immediately push down the engine stop switch. Do not start the 
engine again until the malfunction has been corrected by your dealer.

Test the throttle safety switch 
system daily before operation.

1. Sit on the seat.

2. Start the engine and allow it 

to idle.

3. Hold the throttle lever pin 

stationary by exerting pres-
sure on the pivot pin in the direction shown in the illustration.

4. Apply a slight amount of throttle. A properly functioning switch 

must shut down the engine.

Stop Switch

56

OPERATION

Throttle Lever

WARNING! An improperly functioning throttle lever may cause erratic 
snowmobile behavior and loss of control, which could result in serious injury or 
death. If the throttle lever does not work properly, DO NOT start the engine.

If the engine stops abruptly when the throttle lever is released:

1. Turn the ignition switch to OFF.

2. Visually inspect the throttle cable and carburetor(s) to determine 

what caused the safety switch to activate.

3. Test the throttle lever by compressing and releasing it several times. 

The lever and cable must return to the idle position quickly and 
completely.

4. If the throttle lever operates properly, turn the ignition switch on and 

go through normal starting procedures.

5. If the engine doesn’t start, take the snowmobile to an authorized 

POLARIS dealer for service.

Tip: Excessive free play in the throttle cable may cause the safety switch to 

activate, preventing the engine from starting. If this occurs, return the 
snowmobile to an authorized POLARIS dealer for service. 

If an emergency exists and it’s necessary to start the engine, the throttle 
safety switch and engine stop switch may be disconnected from the wire 
harness. When these switches are disconnected, the ignition key switch 
must be used to shut off the engine. DO NOT continue to operate the 
snowmobile with the throttle safety switch disconnected. Return the 
snowmobile to an authorized POLARIS dealer for service as soon as 
possible.

57

OPERATION

Emergency Stopping

The following chart lists methods for stopping the snowmobile in the 
event of an emergency. Refer to page 55 for more information about the 
engine stop switch and throttle safety switch.

Emergency Starting

Your snowmobile is equipped with a tool kit containing essential tools 
for emergency use. Snowmobiles equipped with electric start have a 
recoil for emergency starting. If the recoil starter system fails, an 
emergency start strap is provided in the kit.

SYSTEM

WHAT IT DOES

THROTTLE

CONDITION

Ignition Switch

Interrupts ignition circuit

All

Brake

Slows jackshaft

All

Choke

Floods engine

Half throttle or less

Engine Stop Switch

Interrupts ignition circuit

All

Throttle Safety Switch

Interrupts ignition circuit

All

Tether Switch (Option)

Interrupts ignition circuit

All