Tornado updates
I doubt very much that the rattle that you hearing is a broken clutch basket, when it goes it is the most awesome sounding banging you have ever heard, to my knowledge, I am the only Tornado rider that has broken a clutch basket gear in Australia.
Tornado & TnT engines are just noisy. If you have an abnormal rattle, I would say that it relates to the first ever Tornado update, the 'generator coupling bolt lock washer'. If the generator coupling bolt comes loose, and the early ones could because they were only loctited in, the generator driven gear rattles on the generator drive gear on the back of the clutch basket (the same one that brakes) and wears the teeth real bad.
This problem has only ever happened to me and Tax in Australia, and Tax it happened twice, firstly beacuse Benelli did not have Tax's frame number on the original update listing, and secondly, because the idiot repairer reassembled the engine without the lockwasher! (Scot Walker Motorcycles).
The affect frame numbers for Australia are:-
ZBNTB00003P100016 (NZ)
ZBNTB00003P100017 my Tornado
ZBNTB00003P100027
ZBNTB00003P100028
ZBNTB00003P100033
ZBNTB00003P100058
ZBNTB00003P100059
ZBNTB00003P100061*
ZBNTB00003P100077*
ZBNTB00003P100161*
ZBNTB00003P100213
ZBNTB00003P100214
ZBNTB00003P100215
ZBNTB00003P100220*
ZBNTB00003P100297 Tax's bike
The frame numbers with the asterisk after it might not have been done as I did not receive dealer confirmation of them doing it.