i would just save yourself a ton of money and go ahead and buy a good clutch. ive been runnin the street bike clutch now for a while and its never slipped once on my 77hp 4mm stroker. you can get them from Jeff @ FAST racing in holton kansas. for the springs, steels and fibers it costs 95 + shipping. give him a call @ 1-785-364-5325. tell him Tyler Clark gave u the number.