I will have a bike with a crank shaft out. I think my 8 year old needs a CRF150R motor but somehow fitted into a KTM65 Chassis. Anybody ever heard of such a thing? I am seeking advise on the possibility of doing it. Point out what the drawbacks would be. I think there is room, but I haven't measured. What do you think? Maybe Service Honda has attempted something like this. Didn't they put a CRF250X motor in a CR85R Frame?