I have noticed several times while working on the bike when the engine and key is off that I periodically hear what sounds like the fuel solenoid cycling on and off. Is this normal? I'm concerned about it wearing down the battery over time if it sits for long periods. My bike is a 2009 model for what it's worth.
I think what you're hearing is air entering the gas tank as it cools.
It's been reported on the forums a few times, and I think any actual electrical activity is highly improbable when the ignition is off.
I have noticed that since the weather has gotten warmer, every so often there is a whining noise coming from my tank. I can place my and on the fuel cap and it will be muffled, and am hypothesizing that it's something to do with air entering or escaping.