thats a hardknock Kelly kikker, there's still some debate whether the bike is street legal or meant for off road use. Some states have pulled the registrations but others will allow them as a custom garage built. I think they can be regged in NV.

The HardKnock is a kit you build yourself comes in 4 boxes and you assemble the unit. Comes in 100cc all the way to a 200cc and there are only a handful 250cc V-Twin units that I have seen on the kikker forums