CB1100 Idle speed instability problem

[max]

Data for Doc;

resistance of cold ( 20 celsius ) eot sensor 2093 ohms. engine starts and runs at 1500 rpm.

after 2 or so minutes the engine dropped to 1100 rpm and i switched it off to measure the resistance with a known accurate fluke digital multi meter and i have made a little connector which plugs into the eot sensor 1/8" spacing molex.

resistance at 1100 rpm. is 453 ohms and dropping ( temp still rising at that time )
this is a moving target as the engine is still transferring heat through the metal but much lower value is likely with a hot engine.

Resistance to engine chassis is infinity ohms ( the sensor floats electrically ).

Voltage takes a bit more work to do accurately.

Some observations; engine does not start with eot sensor disconnected and engine light comes on, it just stutters.

If the engine is started very quickly DURING the initialization phase ( when the meters are cycling ) the rpm's are initially higher and drop quickly to 1050, ( i've noticed this before and did not think it was important until now
this could mean that the iacv starts open and then moves to the desired setting of 1050 rpm.

Again; my cb1100 is from 2010 and does not have any issues.

cheers max