Developed and manufactured by Barnett for the Big Twin and Sportster models from Milwaukee. The Scorpion billet clutches feature friction discs with carbon ceramic compound that provide over twice as much friction surface area compared to your stock clutch and will hold all extra horsepower that is added to stock engines. All Scorpion clutches provide a positive engagement and release. The age-old problem of “finding neutral” is virtually eliminated and shifting through the gears becomes smooth and precise. Steel spacers on the clutch pack ends eliminate wear on the aluminum surfaces. Scorpion billet clutches incorporate six heavy-duty coil springs instead of the stock diaphragm spring. In addition, an extra spring set with a different spring rate is included which allows the clutch to be tuned from mild (street) to wild (race), depending on the usage. Tunability is easy without the removal of the primary cover. This kit is made to be used with the stock Harley-Davidson clutch basket. A replacement disc pack for the respective clutch consisting of all steel and friction discs is available separately.