Centrifugal force allows the actuator arms to move outward, which applies extra pressure against the pressure plate and clutch springs for positive engagement with no clutch slippage Gives you the advantage of using the lighter pull 6 clutch spring set with no clutch slippage at hard throttles Works well on any size engine Manufactured from hard anodized CNC machined billet aluminum Includes instructions This will not work with early BDL stepped dome pressure plate or open belt drive systems with dome pulley cover Fits BDL 8mm belt drives with dome style BDL pressure plate