Kawasaki 650/700 Prairie, Brute Force 650i Models Stock, 0-2000 feet elevation, tires up to 26 inches DK650/700S. This combination of a new, slightly heavier secondary spring and our plain/white primary spring has resulted in better belt grip and an increase in bottom and midrange throttle response and acceleration. Better belt life and improved backshifting for off-trail situations have made this kit very popular. For use with 25-26’’ tires.