2007 Polaris 550 LX Owners Manual - Page 65

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 between -10 to +10 degrees F. (-23 to -12 degrees 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 88 for more information. 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. 62