I find that many times when I am getting gas, opening the gas cap, I get a pretty good amount of suction. So much so that I've learned to put my hand over the gas cap so the spray doesn't get on the tank. None of my other bikes do this but they are not MV's. Is this normal or should I be looking for a clogged vent? I will say that I don't have a stock gas cap. It's a CNC pictured below.
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