I've just had my 12,000 mile (20,000km) service done on my 2004 model R1 and the mechanic has asked me to take the bike back so he can examine the clutch which, in his opinion, is too noisy. I haven’t noticed any excessive noise and have had no problem with the clutch whatsoever, it feels smooth and has never slipped or caused a problem. However, given what the mechanic said, I'm curious as to what the problem could be. I'm not worried because any work would be carried out under warranty but is there anyone out there who may have an idea as to what might be causing the excessive noise?