Odd noise at certain RPMs

How's it going guys,

I've had my K11 for a year now and there has always been this odd noise when I accelerate from between 2000 - 3500rpm.

There is what I would call normal engine acceleration noise and the at 2000rpm up to 3500rpm, it sounds almost like gurgling of some sort and then from 3500 up back to the normal noise.

Any Ideas? would a tune help or is it something simple?
Thanks in advance,

Rhys.
 
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