Just heard this yesterday, but kind of glad they’re gone. Mine are always open anyway. Tried closing them before and the only thing I noticed was turbulent air coming up from the tank at highway speed with them closed. Could feel it start and stop with opening/closing of vents and could physically see the rain coming up around the tank the couple times I tried it in the wet. If nothing else it’s less moving parts in the fairing assembly.
I’ve tried opening and closing the upper vent under numerous conditions and combinations with the lowers and never noticed any difference. The only time my upper is closed is going thru toll booths. I have a small piece of Velcro attached to the button to hold my easy pass and opening it puts the pass at the right angle, gets read every time. After I go through the toll booth the pass goes back in glove box and vent gets closed. I’ve heard of some guys that get a whistling sound from their upper vent not closing all the way due to the rubber “tab” not being seated right. I’m not explaining it right, but you can see it if you have it off for anything.
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Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.