Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 136Get this manual
CARBURETION Pilot System (0-38 Throttle)
The pilot system's main function is to meter fuel at idle and low speed drivingThough its main function is to supply fuel at low speed, it does feed fuel continuously throughout the entire operating rangeFuel for the pilot jet is drawn from the float bowl, mixed with air regulated by the air screw, and delivered to the engine through the pilot outletThe mixture is regulated to some degree by adjusting the air screwWhen the air screw is closed, the fuel mixture is made richer as the amount of air is reducedWhen the air screw is opened, the mixture is made more lean as the amount of air is increased
Throttle Valve Throttle Stop Screw Bypass Pilot Outlet Air Screw
Pilot Jet