I suggested the XR route because they are realitly cheap to find used, and have a really great resale value when its move up time. I know all about the money issues. Great things aint always free. But if you persist on it, get him a KX65 or similar bike, although they may be more at the initial time of investment, and tmae it down, and as he grows then open it back up and let him rip on it. It just may be frustrating or overwhelming learning how to ride, all the skills that go with that, and then add a clutch and gear selection on top of it all. Im not saying it couldnt be done, but you would get more out of the bike, but it would take alot more patience, practice and perservence. Good Luck on what you do decide and i apologize it i offened you in any way with my post, i know not everyone has a money tree in their yard, at least i dont anyway. Lol. But may i add that its great that you want to introduce him into one of the best sports ever!!!