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I have a 89 yz250 and was just wondering if anybody knows if i could change the engine to something much bigger say a 450? if any body has any info or nows where to get it plz help!
 

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Why would you want to put a 4 stroke motor into an old frame??? Why not just buy a YZ450F if that is what you want? The YZ250 with a bigbore kit like the 285 is a huge improvement in the powerband.

Welcome to E2S.
 
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