Polaris Trail Touring Owner's Manual page 63

OPERATION
Carburetion
Proper carburetor adjustment is critical. Always have your Polaris
dealer perform any carburetor adjustments.
A lean mixture (too much air, too little fuel) may result in piston burn-
ing, bearing failure, or complete engine failure. A rich mixture (too
much fuel, too little air) may foul plugs and cause generally poor engine
performance.
A lean mixture may be caused by things like fuel line restrictions, for-
eign matter in the carburetor or clogged fuel filters. A rich mixture may
be caused by snow build-up on the pre-filter in the air intake system.
Either condition may be caused by improper carburetor adjustment.
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