STM SLIPPER WET CLUTCH YAMAHA R3 2014 - 17

BRAND: YAMAHA

MODEL: R3

DOES NOT INCLUDE BASKET AND PACK DISCS TO BE USED THE ORIGINAL

STM’s first experience with a wet slipper clutch dates back to 2002. The excellent results obtained in terms of smoothness of operation and overall reliability led STM to further their development. Today STM is proud to offer a complete range of slipper-clutch systems for the most popular Japanese and European Sportbikes. Working with top World SBK teams, STM focused on the possibility to adjust the engine brake dynamics by modulating several clutch system parameters. This led to a research and development program which focused on the characteristics and utilization of different types of diaphragm springs (the “Evoluzione” technology). STM slipper clutches operate through two “Evoluzione” diaphragm springs which allow the modulation of the clutch: one (the primary spring) replaces and functions like the coil springs of the OEM clutch; the other (the secondary spring) controls the operation of the antihopping mechanism inside our clutches. The action of the “Evoluzione” primary diaphragm spring is digressive, on the contrary to traditional coil springs. The progressive nature of coil springs means that the more they are compressed the harder they are to be compressed. Basically with coil springs the clutch pull gets progressively harder as the lever approaches the handlebar. This is not the case with a diaphragm spring which gives the ability to apply a smaller force on the lever to achieve the same amount of spring compression. The result is an easier lever pull towards the end of the range of motion for the lever. Another benefit to the “Evoluzione” primary diaphragm spring is that it applies a greater force on the clutch pack than a coil spring. The “Evoluzione” primary spring also allows a faster and superior engagement of the clutch under acceleration. In addition, adopting the “Evoluzione” technology into our secondary springs allows our clutches to be completely adjustable in regards to engine braking. This enables the clutch to be set up to suit the rider’s preference for a multitude of specific circumstances. The smaller the load of the secondary spring, the less engine break the rider will experience when downshifting and vice versa. For practical reasons all STM slipper clutches are sold for a specific application with a base primary and secondary set-up that is recommended by our technicians. Our clutches, however, offer the great advantage of being adjustable to the rider’s preferences simply by changing the load of the primary and/or secondary spring. STM technicians know that the lubrication of all clutch components is an extremely relevant factor for the durability of the components themselves and for their consistency during races. The lubrication of the clutch is guaranteed by the new FLS (Forced Lubrication System) which assures optimal circulation of engine oil through specifically designed passageways.