I apologize in advance for the length, just wanna get as many details out as possible. So earlier this summer I came across what i believed to be a steal of a deal. A guy I knew from town was selling 2 non running 2000 zr 600s that looked in fairly good condition (other than a tear in both seats) for just $400. I was told that neither have ran in about 2 years when one motor blew and the second was bought from a family friend for a parts sled. They never got the time and wanted them gone. I bought them planning to get both of them running, one for me and one for my girlfriend. Long story short I got the first one running with just a new drive shaft, chain case parts, and idler wheels. But that was the one with the good motor. I am now onto the second one. This one has about 4000 miles and one cylinder with no compression and the other with about 100 psi. My initial thought was just a quick top end rebuild and a chain case (as this one was stripped because it had reverse) and it’ll be good to go. I would also like to quickly point out that for this sled, my goal is to just get it going for as little money as possible for this years snow, then really dig into it over the summer when I have some spare cash. So once I tore apart the top end, I found an almost completely demolished piston. Like both skirts are about gone and there’s alittle bit of something melted into the top of it. BUT, the cylinder walls have no scuffs at all and there is no noticeable damage anywhere else, even the head. So my question is can I just go along with my plan of a quick top end rebuild, by which I mean just a light hone on the cylinders and 2 new pistons. Or should I be worried about something else that may have happened. I’ve done 2 top ends before and never seen a piston this messed up. I’d really hate to pour a lot of cash into a top end and chaincase and have something else be seriously wrong so what else should I look for? I looked down in the crank to see if anything got damaged and it all looks fine and the same as the other side. I guess I’m really just looking for some suggestions so anything will help. Thanks!