First thought would be the lifter bearing. Its the roller bearing on the clutch outer hub assembly. You only have to remove the outer hub of the clutch. Pretty easy to access and change. Since your mechanic, it would be a very easy job for you to do. There is also a needle bearing, usually reffered to as the starter bearing, on the clutch hub inner. that one is a little hard to deal with. You will need a clutch tool and have to remove the entire clutch to change it. But, that one usually is not the one that goes bad. The majority of the time, its the lifter bearing. You can also grasp your clutch, and see if it has any play in it on the shaft. If it does, then the starter bearing may be bad. If there isnt any play, it shouldn't be cause of any noise.

just a side note though, some rumbing noise is very common. Its much more pronounced on the cbr 600F1-F3 series bikes. I would listen to someone elses and make sure its not the normal noise when the clutch is not engaged that those bikes tend to make. If its not rediculously loud, I'd bet money its the normal noise from the clutch.

 

thats interesting... maybe thats the noise ive been hearing on mine too... i dont know anyone else who has a 95 f3 so i donno how im going to make sure but im glad i stumbled across this.