ideas

So I have seen these Honda motors for go karts and minibikes and started thinking about mounting them on a bicycle. Has anyone done this before and what are the results? speed, mpg, power, problems. The motor I'm looking at is a Honda GXH 50 and it has 2.1 HP. Any help or info would help...

My older brother makes custom bikes for a local vintage bike club, and we are contemplating buying 2 powerking 49cc sets for some tinkering fun. However, it looks like they are totally illegal in ny? Anyone ride in ny? Email me if you have info or just reply here:-|| really wanted to build one...