Well I finally got around to rebuilding my top end....new pistons, rings, cylinders, and gaskets.(Sorry, no batteries=no pics). After pulling the old pistons out, they didn't seem nearly as bad as I was expecting. The rings still had a good amount of spring in them, nothing looked too worn. After sitting and looking at it all for a few minutes, I realized there were NO GASKETS. Nothing under the cylinders and nothing between the cylinders and the head. Could they have simply disintegrated? The bike has at least 30k miles on it, yet the pistons look ok.