Seems like there has been confusion over which wire, resulting in some controversy over the potential effectiveness of this. That happened in the original thread that I read with grayracer513, back in 2007.
It did indeed. It's easy to see how the confusion could happen, since the color of that circuit changes multiple times, and is the same as part of the neutral switch circuit.
The neutral switch circuit on the harness side of the CDI connector is shown as being EITHER sky blue, or blue/white. However, the lead this wire connects to at the CDI is sky blue only. There is a blue/white lead coming from the CDI, separate from the sky blue lead. This lead connects across the connector to a blue/black wire, which connects to yet another blue/white wire at a point between the starter relay and the the relay diode pair
. This makes the CDI aware of current flowing between the relay and diode, so it does in fact "know when the button is pushed".
I have no first hand knowledge of whether this works as advertised or not, but any argument against it based on anything to do with the neutral switch is inoperative on its face; the two are NOT related.
Either way, the point that the bike has to be tuned correctly is valid. Going by what Don has said, it's worth trying at the least.