If you already know where another thread is, don't bother replying and just post a link Anyway, I have a 1986 CR250, last owner of 3 years said that he didn't know anything about a "piston" or a "top end job" when I asked, @_@ Anyway, here're my questions: Should I replace the entire top end? Since I don't have money for a whole new top end can I just replace the rings? Or should I ride it until I get a job? Basically, since I can't get a new top end, should I even bother getting new rings? Or would it be a waste of time?