http://www.maxbmwmotorcycles.com/fiche/MainDiagrams.asp?VIN=6309411Hi, I,m new here , I,m from Spain, happy to say hi at all.
They are strange noise at this level ,the the rubber bumper in the alternator are new , maybe the alternator bearing driver is bad , in this pic where is located this bearing ?
thank,s.

This is the alternator. Bearings are Nos 14 and 18. In your drawing bearings are Nos 10.

The noisy alternator is a common problem on the K bikes.
I myself have a noisy alternator and already replaced the bearings without any improvement. I also replace the bearing #10 on the sprag clutch and it didn't make any difference too.
My brother's bike was so noisy that he thought that the engine was shot. In fact it was only the alternatorand after replacing it, the noise went away.

Now that I know that the problem is at the alternator level, I ignore it and enjoy my ride.