Putting this in for my buddies 99 670 formula delux sled. Broke the crank last year (engine had approx. 9000 miles) did a complete rebuild and was looking for a clutching setup that works with this machine. I can't tell you what was in it because the clutches are wrecked and not sure what he has done with them. I ride polaris myself and don't know were to even start, with skidoo running different wieght/spring ratios then what Iam use to.