Stock or oversize tires. Adjustable clutch kit. One clutch kit that can be set up for different terrain and tire sizes/elevations means accurate clutch tuning for your situation. Improved acceleration, back shifting, and belt performance. The location of the clutches on the 900 XP makes the Dalton flyweights a great tuning option. This kit includes Dalton’s patented “Quick Adjust” flyweight system that allows you to add or subtract weight from the flyweights for fine tuning without even removing the flyweights from the drive clutch. Instead of using generic designs, Dalton’s new “Quick Adjust” flyweight in this kit was designed specifically for this 900 XP application. -Instruction manual includes “flyweight Set Up Guide” for most applications.