I thought it was the black shield too because when i tapped on it, it rattled, but after seeing how the aluminum shield fit into the slots
and noticed the tabs werent in the rubber slots, i slipped the tabs in correctly and the rattle stopped. I didnt thing the aluminum shield could rattle
because of the screw holding it down, but it did.. Had a vibrating rattle on take off from the front end also, and it turned out to be the front fender
rattling against the brace that holds it up.. Put some rubber O ring spacers between them and that rattle vibration is also gone. Finally a quiet bike.!!
Also noticed when i went to clean the air filter element after 15k miles, the cover didnt have the rubber O ring to seal the cover to the air box.
Triumph sent one to me from the dealer.. He said most of the R3's he worked on didnt have the O ring installed at the factory.
Its a HUGE O ring.