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.

Update your old 4-speed Big Twin from the old coil spring clutch to the late style diaphragm spring clutch which proved to be superior right from the start when it was introduced in 1985 on Evo Big Twins plus the Pro-Clutch friction area is increased by almost 100%, which allows a decrease in diaphragm spring pressure. For the rider this means less effort at the hand lever, smooth control and still excellent horsepower handling potential. Repeated burn-outs or two-up serpentine riding in the mountains with frequent clutch dragging are no problem for a Pro-Clutch. All kits install quickly and easily into the stock chain housing. The kits for 4-speed Big Twins from 1936–84 come with a durable double-row ball bearing that replaces the shaky stock “caged bearing” for a sturdy connection between mainshaft, hub, and basket. The stock clutch basket may be retained. All Pro-Clutch kits include a clutch hub, friction plates and steel plates, stainless steel pressure plate, diaphragm spring, spring retainer, four shoulder nuts, a clutch hub nut with seal, and installation instructions.

Easy on the hand with smooth engagement combined with no-slip performance at full throttle, high rev take-offs - these are guide lines which are not easy to meet for a clutch system. While modern bikes perform satisfactory in stock configuration, they soon reach their limits with increased engine potential. A 124 cui. S&S powerplant literally smokes the original clutch or requires clutch springs and lever pulling efforts that only some Arnold Schwarzenegger would find acceptable. This problem goes to extremes in drag racing and that's exactly where they developed a brilliant device to fight it: The variable pressure clutch.
Its principle is an array of weighted levers on the pressure plate which increase pressure on the clutch pack due to centrifugal forces when the engine revs up. Clutch slippage is made nearly impossible with this set-up. The drawback is that pure variable pressure clutches are not suitable for street riding with its varying traffic situations. The Japanese T.P.P. pressure plates so-to-say combine the best of both worlds: conventional clutch actuation supported by a variable pressure type pressure plate. The big advantages of this combo are that much lighter diaphragm clutch springs can be used for up to 50% easier lever effort and the weighted levers increase pack compression up to 60% for zero loss of engine performance through slippage. The kits show the best combination of low lever effort and secure clutch pressure for the respective model/engine group. Patent protected in Europe.

Yer finally fed up using that stone hard clutch every time you need to change a gear on your way to yoga class, the local library or your favourite soda fountain? W&W has the fully analog solution, made from natural wood and steel. Customize your hand and arm muscles with – ta-daaah! - HAND GRIPS. Compatible with every OS on the market. No messy wrenching, no dirty hands. No homologation necessary. No USB port needed. Easy pump-O-action!