I was tying down bags on my 2014 FXST just now. I sat on the bike and when I lifted it off the jiffy stand I could hear a "whir-whir-whir" noise from behind the air filter. After a couple of seconds it stopped. When I put the bike back down on the jiffy stand, the same thing happened - a "whir-whir-whir" noise from behind the air filter and after a couple of seconds it stopped. The ignition switch was OFF and I had the FOB in my pocket. I think I read somewhere that this is the IAC that makes the noise. It concerned me because if it kept adjusting while the bike is not working, I assume it will flatten the battery. Is it normal for this to happen?

Yes, that is the AIC as it has a small electric motor in it to raise and lower the valve.

Agree, wouldn't be to worried if it does stop after a while. My car does this when I use the remote to unlock or lock, even before I put the key into the ignition and I don't think it has an IAC. If it has it's hidden really well because I'll be damned if I can find it