Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 147Get this manual
CARBURETION Keihin Carburetor Service Carburetor Disassembly Cont10Remove main jet
11Remove pilot jet12Remove pilot air screw and clean all passages in the carburetor body with carburetor cleanerDry all passages and jets with compressed airReplace gaskets and any parts which show wear or damage