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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 i n the air intake
system. Either condition may be caused by improper carburetor
adjustment.
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 t emperatures, the air is less dense.
Carburetors on m ost Polaris models are calibrated for an altitude of
0-2000 ft (0-600 meters) and ambient t emperatures between -10 t o +10
F (-23 to -12 C). All carburetors must be re-calibrated if operated
outside this production temperature and/or altitude range. The main jet
installed in production is not correct for all altitudes and/or
temperatures.
NOTE: 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 t o be encountered.
Improper carburetor adjustments may result in operator safety
hazards as well as serious engine damage. Always have your
Polaris dealer perform any carburetor adjustments.
WARNING
CAUTION
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 your
Owner’ s Manual Supplement.
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