That a good wiring diagram to go off if from how you described your stator. With the motor running, use a multimeter to check if you are getting power from both the yellow and white wire. Then check the R/R to verify if power is going in on the yellow, and out on the red.
Nice find. Not sure what area you are in. But recently I had to take my Powermax 150 for my yearly inspection. Only place that does "motorcycles" is the local Harley dealership. They hated it until they rode it around the parking lot a few times. Then they had grins from ear to ear.
Its just that the units refered to as Hoverboards are only two drive motors hooked together by a bearing that allows you to tip you feet forward or backwards to change the motion of drive on that side from forward to reverse. No gyros or other balancing devices inside just a motor, incline switch and battery along with a few lights.
I agree with rockynv, there's really nothing special about them. I question why, or who, has been pushing them so agressively on TV and the Internet. For such a simple device it seemed like everyone started talking about them overnight.
So after installing my replacement stator and immediately destoying it, I was able to figure out the problem.
The threads from the flywheel that hold the plastic fan went to garbage. I guess I have been over tightening them. That caused them bulge out on the back side of my flywheel and destroy the exciter coil.
Expensive lesson learned. Don't over tighten the fan bolts. And many thanks to tvnacman for getting another stator and new flywheel out so quickly.