My '10 1050ST has developed a "clunk" when the clutch engages, audible and which I feel through the foot pegs. It's been a clunky bike since I bought it in March. Front used to click on braking, and replacing the discs fixed that (the buttons on the old ones were very loose, with lots of lateral movement). I've checked torque on the engine mounts, and compared free play in the swing arm with my '07 which doesn't clunk. Free play seems the same. My mechanic says the cush drive is good. I'm hoping to have some time this weekend to get the seat off and access rear suspension bolts upper and lower. Any thoughts as to what it might be? I haven't enjoyed reading about sheared drive pins in another thread...