2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 186Get this manual
PVT OPERATION
The Polaris variable transmission (PVT) consists of three major assemblies: 1) drive clutch; 2) drive belt; and 3) driven clutchThe internal components of the drive clutch and driven clutch control clutch engagement (for initial vehicle movement), clutch upshifting and backshiftingDuring the development of an ATV, the PVT system is matched first of all to the engine power curve; then to average riding conditions and to vehicle design usageModifications to the PVT or variations of components at random are never recommendedProper PVT system setup and careful inspection of existing components must be the primary objective when troubleshooting and tuningWARNING