Polaris RMK Shift Owner's Manual page 86

Carburetor (Carbureted Models)
The number stamped in the end of the main jet indicates the jet size. The
jet installed at the time of manufacture is not necessarily correct for your
elevation. It's your dealer's responsibility to make sure the correct main
jet is installed.
Operating the snowmobile with incorrect jetting can result in serious engine
damage. Have your Polaris dealer perform all carburetor adjustments to
ensure all adjustments are done correctly.
Carburetor Adjustments
The frequency at which the carburetors are synchronized or balanced is
important. Properly adjusted carburetors can greatly improve engine
performance, fuel economy, engine life, and reliability.
If you notice any of the following conditions, the carburetor may need
adjustment:
• Hard starting
• Poor idle
• Overheated pistons and cylinder walls
• Plug fouling
• Poor engine response to various throttle valve openings
CAUTION
MAINTENANCE
83