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First call would be to check the belt tension, then whilst in there also spin the tensioner bearings and have a feel to see if they are rough or loose.
If you're not confident enough to adjust the tension...and it really is very easy... then just running the bike with the covers off for while might give a better indication of the source of the noise.
This sounds similar to the noise problem that afflicted some 1100's when the vertical belts were too tight.
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