Mine does it too, but only on heavy throttles, so I tend to avoid higher revs. If I use less throttle it is much reduced. I thought it was to do with the throttle cable but it could be pinking I suppose. It's certainly not imaginary, and I only use Shell or similar extra special juice.
Will now feel confident to raise it at dealer... Sort of pleased they all do it, but sort of frustrated too because I know what that means in terms of what the dealer can do...
