I recently traded a 2001 Yamaha ttr225 for a 2001 400ex even. The 400ex smoked bad but I figured as long as it runs I can do the work. After taking the top end apart I found little wear and nice looking internals. The guy said it was .030 over and whole motor had been gone through but I was skeptical because I was wondering how the rings were gone if it was recent. Sure enough I looked at the piston and it had kcy on it but after measuring it found to be .025 over? I have heard that is a stock honda oversized piston. Well after taking the measurement and it coming to 85.769 I asume they put it back together with standard bore size rings. When putting the oil ring in the cylinder to check gap it fell to the bottom.