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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 -15° to +5° F. (-26° to -15° C). Carburetors
must be re-calibrated if the snowmobile is operated outside this produc-
tion temperature and/or altitude range. The main jet installed in produc-
tion is not correct for all altitudes and/or temperatures. See page 74 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 in the speci-
fications section of this manual. See page 98.
Tip: 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 encoun-
tered.