Hello TT need some help here any info will be greatly appreciated!! I got a 2011 kx250f I rode it a few times then all the sudden I go to crank it the next day and wouldn't start unless I pull started it! Ok then I thought the valves have tightened up! Tore it down and the exhaust valves were to spec but the intake valves had zero clearance! So I pulled the shims out and it had .235 shims so I did the equation and it came to a .220 so I order some .215, .220, and .225! Ended up putting the .215's in! Rode it a few times anS now the same thing!!! Has anyone had any problems out of these bikes with the valves stretching or do you think it just need re-shimmed??? Thanks everyone!!!