I am looking to put a 310r into my electrical challenged cannondale. I've had some serious electrical probs and I'm tired of replacing fried parts. I want to swap in a honda. I'm figuring that the aluminum frame with a port/polish 310r would be fast. What does everyone else think? Does anyone know about custom frame honda applications. I know the CRF450 will swap in easily with new motor mounts. What's the difference in size between the 250r and the 450, i.e. motor mount width and case length.