1999 Ski-Doo Factory Shop Manual Volume Two, Page 190Get this manual
Section 04 ENGINE Subsection 11 (CARBURETOR AND FUEL PUMP)
The compensation ratio will depend on the air temperature and the atmospheric pressureThe higher the air temperature, the leaner the air fuel mixture
The lower the atmospheric pressure, the leaner the airfuel mixtureNOTE: The atmospheric pressure decreases as the altitude increases