Obviously not every ebike is the same. The wiring may be different. If so, this video doesnt apply to you, you'll have to do your own research. Google is your friend.

Some Ebike motor controllers have a white wire, called self learning (which is used to set up the phases on the motor correctly or something). But once setup it would normally be left alone.

My bike went from being able to do around 15mph to almost 20mph

This is for off road use only, as legally ebikes in Europe are restricted to 15mph.

The bike in the video is a python metro ebike that I got very cheap because the battery was not holding charge. I rebuilt the battery with 18650's. I'll be making a video about that soon. So subscribe if thats your thing.