[Flip]

Yep, same here- for what seemed like every time I stopped I would look down to see another one of those was on the floor next to my bike and each time I picked one up it would be rock hard.

That was several years ago now and the ones I picked up are in a pot in my garage and the rest dotted around either the UK or Western Europe.

A quick Google on their purpose says they help reduce sinusoidal resonance of the cooling fins at or near the engine's mean torque peak piston velocity that can cause rider fatigue and a ringing sound depending upon the state of a person's hearing.

So why Ducati chose to fit them with the ring-a-ding of a dry clutch coupled with open pipes so many of us love I have no idea and with the open air box on my 900 as well I am certainly not going to be able to tell if they're in or out.