You can read the ECU with the ignition on or battery power supplied. There's a plug with 15 pins instead of 10 that is similar in color near the rectifier behind the right fairing, but the plug doesn't go there.

I've pulled apart the airbox, velocity stacks, everything that I can find and I still don't know where 14B-86173-70 goes. Maybe it disables the smog pump or tilt sensor? The only thing that I can see is that it removes the neutral light (which i find useful). Leave the dongle in place and you will only have to plug it in each time you run the YEC ECU.lġ4B-86172-70 connects to the fuel pump relay in the tail. Once you do this, you can plug into the race ECU and begin talking to it. I used vampire taps, but you over achievers will solder them in.

I tapped into the RED power wire on the smaller connector going into the ECU and for the ground i tapped into the a white connector near the ECU that has a set of 6 ground wires in it. You can either A) run an extended wire to the battery or B) tap into the power and ground at the ECU connection. The cable is very short and intended to connect to the battery because the race ECU mounts in the tail section. There is a white connector that has a red power wire and black ground wire. Part 13S-8533A-70 does indeed attach to the USB programming dongle. Kind of looks like a top speed, but not really sure what that is. The new ECU removes the speedo, but the fans do work and there's a number above that is also recorded (58) was my number. To install, simply remove the left side panel and it clips in place nicely.

04 yamaha r1 ecu flash