I've been looking at my well-mauled Yonkang Crown scoot "Hummer". I've got about 3000Km on it; the odo went out at 2400K.
It has a nominal 700W brushed motor that actually draws about 20A measured at full throttle, or about 1200W. The odd thing is that the wire from the controller to the hub is 14GA! In fact, after pulling up a long hill, the wires will be detectably warm.
Would upping the connection to 10GA, say, increase efficiency and potentially range, or would it open the door to melting the windings? (I.E. is the 3 feet of 14ga wire acting as a current limiter?) According to a DC motor rebuilder, the discoloration on the comm that I'm seeing is from overloading it already.
I had a look at the wire resistance table linked in the "Wiring brushless Etek, cable guage?" thread, but they don't go small enough for me.