Im currently in the process of making a Pitbike not sure if you guys are too fimilar with them. You can either purchase production ones like BBR, PisterPro etc or you can take little bikea usually 50cc-125cc like Honda, Yamaha, Kawi etc and supe it up for an adult/bigger person.
Right now I have a Honda CRF70 Clone that I'm in the middle of beefing up in to a pretty decent Pitbike to mess around on.
My plans for the bike are as followed:
I'm going to be switching out the tires for IRC IX 10" 80/100, Adding cradles to the frame, Switching Handlebars, Replacing Throttle Cable, Carburetor, Switch out regular stator with inner rotor kit, New CDI + Wire Harness. Repaint frame.
I'm currently in the process of painting the new handlebars that will be going on, I finished priming them yesterday so they'll be getting painted within the next few days.
Still waiting on shipping for my Inner Rotor Kit + CDI and Wires, Cradles and Carburetor.
Won't be replacing the tires until next spring after the winter.. no point in wearing them out.