I did the job on '04 750 GSX-R yesterday, and here is inside the ignition : We can clearly see that 100 ohms resistor. The B/Y wire is tapped on the red wire in the ignition harness so it feed 12v through the resistor, then return a signal to the ecm through the O/Y wire. The R is power 12v, the O is ignition, the Brown wire and O/G does not serve anymore in the keyless mod. If you have question just PM or email me, or I'll probably retype later a full procedure for 04-05. Have fun !