Sorry for the delay. I blame Irma as I now have electricity again.
Rubber_Snake I asked if it was a new noise because mine has had a gear whine noise since day one.
Me, 2009 ABS with 122,000 miles.
I hear it when cruising, steady throttle, at 75 to 80. Full face helmet and ear plugs.
Seems to come from the output shaft area just in front of my left ankle.
The rare times without earplugs riding, think grocery store to gas station, first gear has a good "spooling up" sound.
I wouldn't worry about it unless it bothers you. IMO
Others may say pull the final drive and moly paste the
out of everything.
Winter is coming if you need a project.