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Steve, clearly a 400cc 2 stroke would hand an *** to any 400ex known to man. Hey aaron, Ive yet to see that quad, we shoulda checked it out last time we were there!
The YZ400F is a 4-stroke, I have never heard of a YZ400, unless its super old. And also I wouldnt do the conversion, it might be to much horsepower for the 250X chassis.