ya the chinese stuff is shit. there only good if you're buying a 50 cuz they're cheap and when you break it you just buy a new one. i would go 4 stroke, just because thats where this revolution is going. i know all you 2 stroke die hards might get offended, as i love the smell and powerband of a 2 stroke, but all technology is going into the 4strokes.
not to mention, he is 7, and it will be alot easier for him to learn how to shift a 4 stroke rather than looping a 2stroke when he dumps the clutch and never wants to ride again.