[AndyB]

Originally Posted by Tapoore

Now that I think about it, I remember that there is something unusual about the way that the spur gear is attached to the motor shaft on the Keyang. There is actually another spur gear inside the gearbox that's inserted inside the wormgear. If you remove the stock spur gear, you will probably need to machine a custom insert to fit in the worm gear, so I'm not sure that removing the stock gear would help you. You should probably take a look at the Keyang for yourself so you know what I'm talking about (because it sounds confusing to me).

I think you are confused.

The spur gear he is referring to is on the outside of the gearbox, on the output shaft. It couples with one of the half dozen black hubs you received in the kit of parts.