Since this got bumped. I'll update. I've been riding this bike nearly everyday. I love it! Put a 15 bing on it and it runs the same as it did with the clone. Low 40's MPH. Still haven't serviced the wheel bearings or anything. The 70cc kit is spaced properly, no porting, case matched. The ZA50 hasn't blown up yet! But it's only turning around 7,000 RPM. I would like it to rev another thousand RPM but something is holding it back. Maybe the circuit pipe, IDK.
I've got a 19mm PHBG, intake, etc to swap on it one of these days. But im too busy riding to swap it out. ZA50's rule.