Mattg8230
04-21-2004, 10:16 PM
Hey guys i gotta 99 400ex with many race modifications and Im trying decide if i would rather buy a crf450 motor and put it into my 400EX or bore my 400 Engine into a 440. How much work would it be to put a crf450 Engine into my stock frame. Any suggustions you guys can give me would be great!!