Owner's manual

62
OPERATION
Carburetion
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,
foreign 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.
CAUTION! Improper carburetor adjustments may result in operator safety
hazards as well as serious engine damage. Always have your POLARIS dealer
perform any carburetor adjustments.
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 from +15° to +35° F. (-9° to +2° C.). 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. See page
75 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 for your
vehicle. See page 105.
TIP:Always ensure that the correct jets are installed in the machine for the
geographical area of operation. 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.