CB1100 Idle speed instability problem

[dave]

Update: IT'S OUT! Got the IACV out of the bike tonite without removing the throttle body assembly, like the FSM instructs you to do. I removed the remaining sections of the air box, which allowed me to access the IACV mounting screws. Actually, I removed the screws in the fwd-most section of the air box and forced it to the side because there is a plug connection at the very top that I couldn't even get my fingers on unless I unplugged a whole bunch more electrical connections, and then moved the main wire harness out of the way first. There is absolutely no visible damage or any visible difference between the old IACV and the new IACV. The battery is out of the bike, so I didn't test the valve's operation by turning the key on and off, but I will do this. I expect it will cycle, because I previously heard it cycling every time I turned the key on, whether the bike was running well or not. There is something potentially wrong with the way the valve came out though. I expected the valve to have been positioned all the way to its "as-installed" location, which is the valve rotated clockwise the full length of its travel on the threaded shaft, (this is how the FSM instructs you to install the valve) but instead, it was about 1/3 of what I "estimate" to be its full travel in the opposite direction. I'll have a better idea of how far it was located from the "as-installed" location when I test the valves side-by-side. There is no damage to the threaded shaft, and I do not believe the valve slipped over the threads on the shaft to not rest in the "as-installed" location. The valve came out very easily, with no binding what-so-ever. I have about 50 miles on the bike with the IACV disconnected. During this time it started harder than normal, and the cold idle was 600 - 700 RPM, but once warmed it ran well -perfect idle (but this was only about 50 miles, over three short, around town trips). This makes me believe that the location I found the valve in is probably pretty close to the location it should be in with the engine warmed up and the valve functioning normally. So the question is this: Was the valve improperly installed at the factory, or is there an issue with either the electric motor itself, or a bad signal from the ECU that controls the valve position?