Exactly what 250R parts will fit on the 400EX Frame? Do I have to buy all 400EX parts or will my 250R parts just switch over?

 

Why are you guys still doing this conversion with the 400EX around. I have not saw any 400EX rolling chassis lying around, if I did, I would put a XR650R liquid cooled motor in (and bore and stroke it of course). This would be the Bombadier (or what ever that thing is called) killer. Iv'e rode one and I think they are to big and balky.