mazzola
1 mW
New, never used conversion kit with 4 speed gearboxed motor, controller, and accelerator from Foshan Uni Tech. Originally bought a kit from Alibaba (see similar listing for specs). Asking $500, shipping included, which will get to your door way faster than the 6+ weeks from China. I'm willing to break up the kit if you're only interested in the controller or the motor. Take a look at skeetab5780's dirtbike build too, which uses a similar motor.

(note: my motor has orange phase wire covers)
Shipping available to US lower 48 from Austin, TX

(note: my motor has orange phase wire covers)
Shipping available to US lower 48 from Austin, TX