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Whirring sound at RPM - what is it?

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What is this sound?  Is it a concern?  Whirring sound when revving or driving at RPM.  Not affected by pulling in clutch.  Sound not present at idle and quickly disappears when RPMs drop back to idle level, which means accel/deceleration of motor is a factor.

1979 XR80 but I think I've heard this on other bikes... probably nothing?  Cam chain tensioner?  Clutch needle bearing?  Thanks in advance.

Video of sound:

 

 

Edited by BSK

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