Optimum CVT clutch calibration for Polaris Sportsman 850XP. One clutch kit that can be set up for different terrains and tire sizes and elevation means accurate clutch tuning for your situation. Improved acceleration without losing top speed. Kit includes optional engagement springs so you can set it up for your preference and riding style. This kit includes Dalton’s patented “Quick Adjust” flyweight system that allows you to add or subtract weight from the flyweights without even removing the flyweights from the drive clutch. Instead of using genericflyweights or designs from OEM snowmobiles or regular ATV models, extensive testing led to development of a new custom base flyweight specific to this model. The new “Quick Adjust” SP850 flyweight in this kit has a different curvature and location of mass which allows superior belt grip and RPM control.