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Just use earplugs. But to be serious for a moment, I wouldn't get too excited about the whine. Some bikes just like to sing a little. The 650Vstrom that I had would just sound like a turbine winding up some times. I figure it was in the tranny and was just a characteristic of the bike.
Next time you do an oil change use a different brand of oil to see/hear if there is a change.
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