Okay, so I've got this 2003 Rm 125 that runs pretty good, but I've done minor things to it such as buying aftermarket pipe and silencer, change the jetting, and soon I need to replace the fork fluid and seals. But anyway, one thing I have been debating to do is to replace the piston and rings. I bought the bike 6 months ago from a former pro (It's winter in Wisconsin, so I've only had a chance to race it 2 times). He used it as his practice bike. It was in pretty good condition. He only wanted $600 for it, so I had to take the deal. He said that he had a Wiseco Pro-lite piston in it, but he didn't remember how many hours it had been since he replaced it. So here's the question. Do I buy gaskets, take the cylinder apart, take a look, check the compression, and then if its really bad looking just put it back together and ride it until it blows up? Or, do I buy the gaskets and piston all at once and replace it no matter what? Thanks.