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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 in the air intake
system. Either condition may be caused by improper carburetor
adjustment.
WARNING
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 Gu idelines
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.
Carburetors on most P olaris models are calibrated for an altitude of
0-2000 ft (0-600 meters) and ambient temperatures between -10 to +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.
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.
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 to be
encountered.