Fuel cap vent

[GoldOxide_imp]

Okay Mix*. I am thinkin' maybe this is a basic behaviour due to the fuel tank fumes capture via the carbon canister? The ol' pre-2010s Aprilias had this and made some strange moaning/hissing sounds for up to 30 minutes after a ride before gas pressures stabilized. This was particularly true on warm/hot weather days and not cold days. Anyway, just a thought, not sure if it applies here.