I've been wanting to build one of these Chinese motor kits for a couple years now and finally got around to it. I've already posted regarding exhaust pipes in the general discussion area, so thought I should probably throw something in here. I was happy to find out that motored bikes are actually legal in Wisconsin (as long as they won't go faster than 30MPH w/150# rider on board and have a 2sq/in reflector in the back). All that's required is a driver's license (13yr old is a bit pissed about that....) See attached photo for the bike. My 17yr old is running it mostly.