Make sure it's not a wheel bearing. I had a bad front one one my 07. It made some major whining noise when slowing down. Just a thought.

 

Son 10 St Glide had what sounds the same as your saying, They ended replacing the tranny output shaft bearing behind the clutch packs.. Dealer charge was around $250.




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Inner primary bearing noise will stop when the bike is stopped, in gear, with the clutch disengaged. That's about the only set of conditions where you can be sure that the bearing isn't turning, while the engine is running.

 

Tensioner tightened up your chain.

 

I have an 07 street Glide and it has the new pprimary chain tensioner, they got rid of the old style that you had to adjust yourself, so I can't see why the inner primary chaincase bearing would go out from over tightening. Like a friend of min e told me years ago, all harleys make a lot of strange noises, best to ride and enjoy and quit fretting over weird noises. It'll drive you crazy.

 

The auto tensioner sucks *** and has caused lots of damage to bikes over the years. That's doesn't mean all bikes with the auto setup will have problems but it can trash a lot of things in your primary. The problem it has is that it can't relieve tension. If it over tightens it has no way of relieving tension. There are much better tensioner available aftermarket.

 

Pull the primary. Change all the bearings and seals. Install a Baker primary adjuster. Problem solved.

 

Hey. First post. You said it was not RPM specific, I assume that to mean it occurs at all RPM. You did not mention if it is sync'ed to RPM. When my '07 FLSTC had abour 24k miles, I heard a sound with similar characteristics. When I took it to the dealer, they said it was normal. About 35k-40k later, when my alternator failed (still under extended warranty) the tech (who was the same tech who had ridden it earlier) was quite proud to have found a failed input bearing. drain and inspect your primary lube, if there's metal in it.....