Thanks for all the help. You guys are the best. I'll dig in a little and see what's up. When I spin the back wheels, the center shaft still spins as well as the brake disc. The disconnect seems to be after that. I've seen some good info on basic mods here (clutch and all) is it worth doing CV joints as well? They don't seem to be that expensive. May as well get it all done at once. So far the orange/black one seems really fast. I haven't had a chance to run the purple/green yet. It had a defective fuel tank (complete blockage in the down tube) out of the box and then the issue with the rear wheels. Hopefully it's just a set screw and I'll get to run it as well. Any other suggestions for basic mods?

Thanks again, i really appreciate the help and your time.