I just wanted to put this out there because it's.....so dumb. I bought a 1987 200x for $600 that was smoking but seemed to run fine. I just got new gaskets and rings and went to install everything and then I saw it. The last person that worked this engine swapped the valves. The large intake was in the small exhaust port and the small exhaust was in the large port. It also bent the intake valve. I couldn't believe my eyes. So I ordered a new valve set and have to wait another week to ride while I wait.