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CB1100 Idle speed instability problem
Well you are the only one with a re-occurring isip, i would be inclined to go back to the place that sold you the replacement and ask for a new partnumber one no charge, we are doing Honda a favor by solving their problems for them.

500 odd k's seems a faulty part to me and it sounds like you know what you're doing on the bike.

We still don't know what is wrong with the part but we also have not measured the ohms resistance of the two stepper windings either at this stage and it may be a good idea to measure both of them, write it down and see what the resistance of the other part is, i will measure mine tomorrow and post the result, we may find a clue, who knows.

The iacv is in a hot place behind the cylinders and that may contribute to the fault, it works a bit every time the throttle operates from the stop and it seems it cannot overcome the force required to motivate the iacv piston and gets worse over time, also we could not find any soot deposits around the iacv piston, it was all very clean, was that the case with yours as well?

As a check it may be an idea to unplug the iacv and ride it like that for a short while to isolate the issue, the bike will respond with a softer character, but to fool the engine you can connect the old iacv temporarily and watch the response.......
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RE: CB1100 Idle speed instability problem - by max - 12-13-2018, 08:12 PM

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