www.kartworld.com has a nice go-kart kit and mini bike kit. Be warned though, I used to have a go-kart and the cops do not like them at all. I didn't get any tickets but I was ordered to go home many times.
Also try Manco Karts. They have a bunch of off road karts. I also had three run-ins with the same officer one afternoon in my son's racing kart. I explained how we were "testing & tuning" but he sternly told me to keep off the street!!!! Warning was well taken. Wait till he sees the next one!
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