Just started the project of tearing apart my top end on my '06 kaw 250f, it has the 269cc bore kit on it. I blew a valve so I'm going to try and take it to a machine shop to get it machined back to specs because I don't want to spend the $699 on the head. But I'm going back to the standard jug and piston size so I'll replace the old one regardless. My question is, is there a way to troubleshoot any bottom end damage without splitting it? There is a little lateral movement in the piston once the head and the jug are removed. Is that normal or not so much? If so I'll have a parts bike available.