Harley, I could not have picked a better spot myself.
Look at the attachment. This is the A/F map for a 2009 Dyna FXDL Stage 1.
The map shows Engine Load vs RPM and is made up of 204 cells. All the cells that are blocked off in pen that read 14.6 are closed loop cells and the ECM is being corrected by the exhaust sample and o2 sensor to MAINTAIN 14.6:1 A/F ratio. As you can also see when the engine load is near "0" (map of 20kilo/pascal or IDLE) the management system is OPEN loop and running an A/F ratio of 13:1. Now take a look at WOT. The system does not go open loop until 1750 RPM. at which time the A/F goes to 12.5.
And lastly note that once the engine hits 5000 RPM, regardless of engine load, the system is Open Loop.
The key point to remember is Narrow band O2 sensors can ONLY understand mixtures from ~14.3 to ~14.7 give or take a bit. Closed loop will mean you are running in that window and that window only. To run closed loop but OUTSIDE of that window requires wide band O2 sensors (and of course the software to understand the information outside of that window)
So to answer your question. When using narrow band sensors, which is what HD runs,, when in a cell that is closed loop,,, the A/F ratio will be ~14.6 to 1. When in an OPEN loop cell, the air fuel ratio will be what YOU define it to be.
Does this help clear it up?
By now if you have been paying attention you should have a question....
Your question should be,, well if narrow band O2 sensors only understand mixtures from 14.3 to 14.7 how can the ECM know & understand those WOT mixtures of 12.5 :1 and those idle mixtures in the 13's. ??? I mean whats up with that?:6: