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Discussion Starter #1 (Edited)
The engine seemed to be surging with a low surging noise when in 3rd and @ 3,000 rpm.

This went away when the clutch was disengaged and the throttle released but still at speed.

I did not noticed it in other gears, although higher road noise could have masked it.

Had the windscreen in high position.

Went out again today but with the screen in the low position.

No surging noise.

Also could not reproduce the sound with bike on the centerstand and the engine running.

I'm guessing it was due to some weird harmonics of air flow that resulted in oscillation of the audible engine sound.
 

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Discussion Starter #2
Out again today for about an hour.

Again with the windscreen in the low position.

Even with my head tucked down behind the screen, the surging sound was still absent.
 
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