CB1100 Idle speed instability problem

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So if you start the engine and it warms up at 1500 does it not gradually slow down to 1050 or another acceptable level? when sitting still?
Also try disconnecting the engine temperature sensor ( just below the cam chain tensioner at the back of the cylinders ),
with some combination it may decide to come down to 1050 at which point you can shut it down with the ignition key and unplug the iacv.

As you know the butterfy valves of the throttle body are closed at idle, all the iacv does is supply the " correct "
amount of air passed each valve and has an individual adjustment screw ( 4 in total ) under the throttle body to
adjust the airflow to the individual cylinders and is measured with 4 vacuum gauges to make the engine run with an equalized amount of mixture to make it run smooth, i have checked my 4 set screws with 4 vacuum gauges and all was perfect so i left it alone, normally these do not need service unless the idle is rough and thus " out of sync ".

There is no information in the service manual about this, all it says is " don't touch " but if the tech knows what he is doing.........