Snowmobile Polaris 550 IQ Shift / 550 IQ 136 / 550 IQ LXT (2013 year). Instruction - part 13

 

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Snowmobile Polaris 550 IQ Shift / 550 IQ 136 / 550 IQ LXT (2013 year). Instruction - part 13

 

 

54

OPERATION

Carburetion

NOTICE: Making non-recommended adjustments could result in vehicle or 

engine damage as well as denial of warranty claims. We recommend 
that all carburetor adjustments be performed by your POLARIS 
dealer. 

Proper carburetor adjustment is critical. A lean mixture (too much air, 
too little fuel) may result in piston burning, bearing failure, or complete 
engine failure.  A rich mixture (too much fuel, too little air) may foul 
plugs and cause generally poor engine performance.  

A lean mixture may be caused by things like fuel line restrictions, for-
eign matter in the carburetor or clogged fuel filters. A rich mixture may 
be caused by snow build-up on the pre-filter in the air intake system. 
Either condition may be caused by improper carburetor adjustment.

55

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.

The carburetors are calibrated for an altitude of 0-2000 ft. (0-600 m) and 
ambient temperatures of -15° to +5° F. (-26° to -15° C). Carburetors 
must be re-calibrated if the snowmobile is operated outside this produc-
tion temperature and/or altitude range. The main jet installed in produc-
tion is not correct for all altitudes and/or temperatures. See page 74 for 
more information.

NOTICE: A main jet that's too small will cause a lean operating condition and 

may cause serious engine damage. Jet the carburetors carefully for 
elevation and temperature according to the jetting charts in the speci-
fications section of this manual. See page 98.

Tip: It's the owner's responsibility to ensure that the correct jets are installed in 

the machine 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 encoun-
tered.

56

OPERATION

Engine Stop Switch

Push down on the engine 
stop switch (X) to ground 
out the ignition and stop 
the engine quickly. Pull 
the switch up to the ON 
position to allow restart-
ing.

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.

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 exert-
ing pressure on the pivot pin in the direction shown in the illustra-
tion.

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

must shut down the engine.

X

57

OPERATION

Throttle Lever

WARNING! An improperly functioning throttle lever may cause erratic machine 
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 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.

Excessive freeplay in the throttle cable may cause the safety switch to 
activate, preventing the engine from starting. If this occurs, return the 
machine 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 
machine with the throttle safety switch disconnected. Return the 
machine to an authorized POLARIS dealer for service as soon as possi-
ble.

 

 

 

 

 

 

 

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