Polaris 440 IQ - Manual (Page 58)

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.
Carburetors on most Polaris 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.