STM Yamaha R1 Slipper Clutch 04-05

Direct fitment for the 04-05 Yamaha YZF-R1. STM uses the same technology, which has been already used on dry clutches, on wet clutches, too make performances get better, components lubrication increases system efficacy.This system is working with steel balls and ramps, helps the pilot while turning avoiding the rear wheel to slip during hard braking. Also if you use it on every day roads, there are some advantages: it avoids dangerous skiddings, it increases safety and protects the internal parts of the engine. All components come from STM, they are made on the most sophisticated machines. Each of them has some innovations which are at the base of this clutch efficacy. Drum and hub are realized in Ergal 7075 and oxidized to last long. Also the pusher plate is in 7075, but it has a steel ring which gives a stiff support to the Diaphragm Evoluzione spring . Pusher spring hub kit, has a nut, steel balls and seeger, it increases clutch sensitiveness. Secondary spring gives a perfect control of plates opening, thank to his hardness it is possible to understand the opening moment of the clutch during an hard braking. All clutches have a special key to assemble them. In order to assemble the clutch kit you need the original friction material and basket.