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just another info to add , if its the wheel bearings , you can accelerate up to 50km/h + , then pull the clutch , let the bike roll free , and listen , it can also be tire pressure , i tried riding 28 psi , vs the 38 psi recommended and the tires are making sound like of that a turbine whine from an electric motorcycle.
It can be the fairings too , i had a motorcycle , naked but it has a small windshield in the headlight , and the vibration damper rubber is missing and it makes this Low frequency vibrating noise only at SPECIFIC rpm , like 4000 only and disappears. Try removing all the fairing ride , see if the humming remains.
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