Polaris 550 IQ Shift - 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.
The carburetors are calibrated for an altitude of 0-2000 ft. (0-600 m) and
ambient temperatures of 0_ to +20 F. (-18_ to -7_ 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 74 for more
information.
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.
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 your Owner's Manual Supple-
ment.