Welcome to the forum, I've owned a few motorcycles as well while growing up. Now, that my kids have taken over; these little engines cure my itch for 2 wheels. You can build a basic Motorbike for pretty cheap, but, you'll come to find out that this hobby can get real expensive real fast, so watch out. Take care and post picture of your progress.
Mile High Motor Bicycle
EZ Motorbike Dealer - Denver, CO