I bought a 1987 KDX 200 to ride perhaps 3 to 4 times a year with some of my friends. That may not seem like much, but I work 6 days a week and have two kids under 6. So, I am trying to do this on a budget, but have something reliable too. I have no idea on the history of the bike so I figure it is top end time. Start of disassembly: More: Cylinder looks pretty rough, but feels smooth. My fingernail does not catch on anything. Might still need a replate though. Head: Piston: I am pretty certain this thing has not been opened up at all. I am taking the piston, head and cylinder to the local mc repair guy today to have him measure it for me. I will see about plating and getting a piston/rings etc. When I get it back together I will post it all up.