93 polaris 250
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Doesn't do any good just replacing a stock piston in a worn cylinder bore usually. Have the cylinder measured for the next over size needed as Wiseco,etc has pistons from stock all the way to 2mm over stock size.Then the cylinder has to be bored and honed to the piston. If you happened to have had a new over size piston installed and still no start,usually it's the crank seals that is if you have good spark,compression and good fuel supply.