THIS KIT REPLACES THE THUMB LEVER THROTTLE SYSTEM WITH MOTION PRO'S NEW HIGH QUALITY BILLET MOTORCYCLE STYLE TWIST HANDLE FOR THOSE WHO PREFER THE TWIST TO THE THUMB LEVER. COMES COMPLETE WITH IDLE KIT AND SCREW ON CARB TOPS AND CABLE ADJUSTERS TO REPLACE THE WHOLE T.O.R.S. SYSTEM ON THE STOCK BIKE, TO RETURN THE CARBS TO NORMALCY AND MAKE IT EASIER WHEN WORKING WITH JETTING.