shifter

I have got a 20002 curvey that has exactly the same symptoms you describe, and previously I had a 99 one which didn't make the same noise. My 02 bike has only got 11000 on the clock as well!
I've recently changed my zorst and it made no difference, also changed the oil and checked the cam chain tensioners and the chain tension/lube is fine. I'm wondering if it could be induction noise?
It sounds to me like it's from the front end.