Hi Guy ! I'd like to know if you can do a YZ-426 with a Yz-400. I think the stroke is the same, only de bore is diferent ( 92mm 400 95mm 426) . So does somebody have already done that and whitch part do i need to do it. I also want to know if its possible to convert a 426 to a 450 . I know the base is not the same, but the bearing for the crank is the same. My idea is to use a 450 chrank with a cylinder of 450 and the 450 cam and cam chain. Do you know if it can be made ?