The Eccentric hub on my 450xc keeps moving. I bought the quad last year and had no problem with it moving. untill the end of the season when it moved to much that the chain was so tight it had no movement. I have taken everything apart and cleaned both the hub and swingarm and the next time i ride it will move. It is starting to worry me beacuse I am getting in to racing this year. I dont want to worry about it moving while racing and mess the engine up for the chain being over tight. I was wondering if anyone has come up with a way to keep it from moving?