I had a vibration in my 07 classic at 3500 miles i took it to the dealer and they said they replaced the clutch springs with heavier springs, but who knows, anyway they fixed the vibration, I put 20000 miles on the bike and it came back, took to them again hoping they could fix it, they took the clutch apart and said they couldn't find anything, didn't fix it, I even talk to Pete at Triumph, he said "it's the nature of the beast, ride it " I said bull$^%# it wasn't like that before. Mine does the same, and a lot of others do. take the free play out of the clutch lever and it's gone.