thank you all for you input. to my understanding in the US you can build any automotive vehicle, and register it(much more to it than that). finding a decently affordable NSR in the states is pretty hard to come by. so i've decided to start building my own NSR250 and try to make it street legal.
IF anyone has any information of any compaines, in or out of the US, for chassis and engines please let me know.
thanx. all