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[QUOTE="pelayo, post: 732839, member: 51086"]
Help! I run a 1997 KX80 motor in my shifter kart.  I have never had a problem with this engine until recently when the piston seized.  I noticed the carb was starting to fall off, so I assumed there was too much air getting in and the motor overheated before the piston stuck.  Well, I got the cylinder honed and put in new piston and rings and after heat cycling the engine a couple of times, the first time I decided to go for it, a half of a lap later, the piston seized yet again.  This time my local shop sent the cylinder out for replating.  What should I be thinking about next time I put this thing back together?  Do you think I just didn't break it in (or simply warm up the motor) enough last time?  Also, I really don't know the optimal operating temperature (using the CHT sensor) for KX80s.  Any thoughts?  Last question, I see guys at the track use premix ratios from 30:1 to 60:1.  What really is the best ratio for a stock motor?  Any and all help would be greatly appreciated.
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