hey Trikers, I have a lead on an 85 250sx complete. SUPPOSEDLY, it has the top end off due to a stuck exhaust valve. I'm VERY mechanically inclined, just virgin to trikes. What all "could" be wrong with this ??? I know you can't tell me exactly without more info but if I look at this today give me some ideas. As I said, the top end is supposed to be off but everything is there. THX