Hunting rpm

[SportsterDoc]

My CB developed higher idle revs when being warmed up without me knowing why.
Since summer I get used to it and talked to Honda engineers about this phenomenon. One gave me the tip to ignore it and take it as being normal. There are a lot of sensors interplaying with the ECU, but which one can be the reason the higher revs? Another engineer suggested to let the ECU reset by a honda dealer and if this will not cause any change, then a new program can be played into the EPROM, which was developed to stop the low rev idle problem. It may help.

I will do the first and maybe the second step next spring. All I found out 'til now is, the engine has higher idle revs when it is cold, 1.500U/min. Then, when the machine is slightly warmed up, the idle speed sinks slowly down to 1.050. So far so normal.
After a few more km the idle speed does not return from higher revs when I close the throttle to these revs, but stays at 1.500 as being cold. But I can bring the engine to have the normal idle speed again by either use the key off mode and then start the engine again. Or I slow the machine down in a high gear, which causes less then 1.500. Then the idle speed is normal. I often use the second method. The CB is somehow a machine of mircales and wonders. And it is a standard 2013 one.

Wisedrum

Once my bike enters the high idle (1,500 rpm) mode after reaching operating temperature there is nothing I can do, except unplug the EOT sensor, to get the idle back to the normal 1050 rpm. I have tried your suggestions and they didn't work for me.
Installed a new EOT sensor last Saturday. The idle speed actually returned to normal after warm-up (1,050 rpm) for a short while, but after a few miles of 2nd gear stop and go riding in the neighborhood it returned to 1,500 rpm (seems the engine just needed to get hotter). Unplugged the EOT sensor and the rpm returned to a perfect 1,050 (never ran better!). I was in a rush and didn't measure the resistance of either the old or new sensors before installing the new one. I checked the old sensor and it measured 1.90 kilo-ohm. I removed and inspected the new sensor and it measured 1.95 kilo-ohm. Both the old and the new sensors are out of spec, which is 2.4 - 2.9 kilo-ohm. Now I have to see if the dealer will swap this sensor for a replacement. Even though unplugging the EOT sensor causes the bike to run perfectly, and both of my sensors are out-of-spec, I am not convinced the EOT is the root cause. I sure hope Honda comes up with a fix because this is frustrating me, and I am out of warranty. I asked at the service counter if there were any known repairs for this condition and I was told that there are not any recalls or service bulletins available. So please, if anyone does get their ECM remapped by Honda then please let me know. I also tried disconnecting the battery to see if this would reset my ECM but this didn't do anything either.

Dave, I found your post Googling for EOT resistance values.
Difficult to find much other than this forum.

At what temperature were the new and old sensors measured for resistance?
At what temperature is the spec for 2.4 - 2.9 K ohms?