Read the info here for more details on importing bikes
http://www.pocketbikeforum.com/artic...-part-2-a.html
One way you could try and get away from issues at the border, is to simply import the bike as a RUM and once it's here add the things that are required and go apply for a VIN and state that it is a custom built machine made by yourself. That may work, but there's never any guarantees.