Re: trying to build a commuter
If you want to be able to pedal you will have to make sure you have a kit that freewheels easily. The chinese kit I had did not freewheel, the chain and clutch housing always rotated when the wheel rotated.
I know Staton has a freewheel kit and I believe that Dax Titan is easy to pedal. Golden Eagle, I think you have to remove the belt to get free pedaling.
But to repeat, you are not going to get an easily pedalable bike if you install a 2 cycle chinese kit.