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Performance Clutch

Performance Clutch

T.P.P. Centrifugal Weight Assisted Clutch Pressure Plate
T.P.P. Centrifugal Weight Assisted Clutch Pressure Plate
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.
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Stronger clutch

The extra performance on the crankshaft must somehow be transferred to the road. The solution: more friction (= transmission) surface of the clutch plates or increase the contact pressure. The complete solutions from Barnett and Rivera definitely offer more friction surface for clutches on 4-speed bikes. On the subject of more contact pressure, the concept of centrifugal (slipper) clutches comes from drag racing. Not only do they only engage above a certain speed, they also allow a defined slip in the lower part of the speed range in order to increase the torque. In other words, the sensitive action of the clutch hand is virtually automated. Barnett has adapted this idea to production bikes with the Lock-Up clutch. T.P.P. supplies precision-milled pressure plates with centrifugal weights for the Evo models.

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