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kx 500 af and kx 250 af??

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im interested in building a either a kx 500 af or a kx 250 af. i have friends with a machine shop. i was just wondering which four stroke chasis would be better suited to the project the 450 chasis or the 250f chasis. i plan to build it out of and 2009 modle. and i was wondering what year kx250 and kx500 motors work best

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im not 100% but i think past 1988 or something all the kx500 motors are the same. and im pretty sure service honda/kawasaki uses a kx250f frame but im not sure if thats just because its easier. do they have a decent tig welder cause then it dosent really matter im sure youll have to make new mounts anyways.

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is there any difference in size in the 250f and 450f chasis other than the motor. ive had a crf250 and crf450 and the bikes stood of equal size

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