[pete]

A lot of jap bikes have a anti shudder ring in the clutch
stack to stop the rattling noise... On my XT660 is is in the first plate
to go in or last plate to come out in the stack...
against the back of the hub... that plate is half as wide as the other
fricton plates and on the inside of it there is a narrow wave washer/strip
that keeps tension on the stack when the clutch is pulled to stop them moveing around/rattleing..

I would say it normal in a motor with out the anti shudder ring..

PS... have you ever heard a dry clutch on a Ducati where theres no oil to damp the sound
of the clutch and air vents in the clutch cover...