WOW. Where do you live. i hope not Va because I am always winding down the road. I live in military housing and there is a nice parking lot that I do laps on. I have never been bothered though. My Kart is still pretty loud with a silencer but I don't feel like it is any louder than someone driving by with there speakers blowing out windows.
That suck about the cops. I live out in the country, but when the cops try to pull me over I hit the feilds and make my way home. One guy got a ticket for $1200 for riding his kart on the gravel road, plus he wasn't wearing a helmet.
Nice minibike. Could you maybe post some pics of your throttle hookuo on that briggs. I have the same type of engine, and am not 100% sure how to do it.