I was riding my bike when I heard a vibration I pulled over to see what was vibrating I couldn't find anything so I got back onto the road and I realized I didn't have any power and my clutch is going out, so I assumed. I bought some new clutch disc and replace them the mechanic at Renegade said that the Clutch disk was burnt and that I should have replaced the metal rings between the disc. what would make my bike roll forward when in gear? Or is there another problem.