The SP1 and SP2 both use 7 fiber's and 6 steel disk's. The SP1 has 5 inner fibers (same as SP2) and a different material (Honda disk A) fiber for the outer and inner most friction disks. The SP2's outer most disk is the same as the SP1 (A) but the inner most is different yet again (disk B) to allow for the sp2 only judder spring.
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Ronayers.com Fiche Desktop Motorcycle Honda 2005 RVT1000R CLUTCH