4300 was the first attempt
copy from:
The Official 4300 Brushless/LiPo/Foam Touring Thread post #153
The updated solder tabs have nothing to do with the timing of the motor. The reason we went to them was two fold. First it has less voltage drop than the PC Board and secondly it is easier to solder the wires to it.
Actually we designed the 4300 to be an equivalent stock motor but it turned out to be as fast as a 19 turn so that is why we brought out the 13.5 turn. This time we sent quite a few 13.5 turn motors to drivers around the country to get their feedback instead of our own. Now we have two motors that are what I like to call Spec class motors. And yes we a pleasantly surprised that they are catching on so fast.
Bob