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Discussion Starter #1
ok i just purchased a 2001 sportsman 400 for a father/son project. measured piston and its a 87mm ......... all ebay kits say its a 83mm and 500cc kits are 92mm.......... why cant i find a 87mm kits??????? that would make this 400cc a 425cc right??? searched and cant no kits or any info............ can i bore this to a 92mm and use a 500cc kit???please help us figure this out so we can go riding!!!!!
 
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