Getting a clunking sound

[lew600fazer]

Hi Not long in after a blast on my FZ1. Forgot to use my ear plugs. Anyway I am getting clunking/rattle coming from the under the engine?  I have had a look nothing seems to be adrift or slack. To be honest sounds more internal and possibly around the clutch area. Any ideas as I am new to the FZ1, could it be the clutch plates/basket/ There is no loud clunk when changing or engaging gear. When on a smooth road surface it is quiet. It is not affecting the performance of the bike just annoying especially over rougher road surfaces, really noticable when going over say a speed hump. Maybe the center stand has a weak spring?
Appreciate your thoughts.
Lew