I got a deal today for a 400 ex, not bought yet but the guy told me he'd sell it to me for 700$. A picture of it below. He said that he believes the reason it wont run is because it skipped a tooth on the cam chain. 700$ seems kind of fishy considering the amount of stuff on the quad. I guess the question is, what am i getting into if it skipped a tooth on the cam chain? A new cam??