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03 KX125 won't turn over...

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Ok guys i have the same EXACT problem only mine is a 98' kx125. I just bought it, cleaned everything up, changed tranny oil and mixed fresh gas, cleaned the air filter and all that good stuff. i rode it around easy for a little bit and as i pulled back into my drive way it slowly died (just like monstermx 117 described). i has a fresh top end and the motor is quite and tight(runs perfect never gave me any grief). I put a brand new plug in it and tested it (it has great spark) all of the wires and connections look perfect. I took off the carb and cleaned it completely inside and out. and still nothing. just like monstermx117 said it will backfire after every 10 kicks or so. Any help will be greatly appreciated!!

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The rings on my piston were seized. There was no play whatsoever. Take your piston out and take a look at it.

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