Well yesterday I finally got round to changing the oil and filter on my bike and as I had the side fairing off I decided to change my clutch cable as it's been a bit clunky and rough feeling and I bought a Venhill one ages ago. So went out a wee blast tonight and what a difference, so much smoother absolutely amazing, I know my original cable was probably getting by its best but I know that they never felt so smooth even brand new.
Have you checked the throttle cables? I found mine needed doing the same time I did the ckutch cable.