From what I know this is normal. Mine makes a quiet noise and my 05 ZX6R used to make a loud whine on hot days. Everyone on the Kawi boards talk about it as well so I figure it's nothing to worry about.My V is about a month old. No gas smell but I do get the hissing from the tank after I park it. I know the FI system pressureizes the tank but I'm wondering if I have a vent pinched somewhere?