Polaris 2013 WideTrak LX - Manual (Page 58)

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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.
All carburetors have been pre-set at the factory to the settings indicated
by the shaded cells of the jetting chart on page 105. 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. The number stamped in
the end of the main jet indicates the jet size that was installed at the time
of manufacture.
NOTICE: Using non-recommended jets and/or needles can result in shorter
engine life, lower fuel economy, increased emissions and poor
performance and drivability. Always use POLARIS-recommended jets
and needles.
It’s the owner’s responsibility to ensure that the correct jets are installed
in the snowmobile 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.