Hello! My sheave got fixed! I put the quad in reverse....reverse light came on....and the quad backed up. I went forward, and everything was great. Then I tried reverse again, and the light would come on, but the engine would only rev up, it would not move. This has lasted for a couple weeks, then yesterday, when I started it - I tried reverse....and it moved, I moved it forward to try again, and then it refused to move again. I don't know much about these machines (Yamaha) but it seems like even though the reverse light comes on, something isn't telling the bike it's in gear....where should I start with this problem?