There is no flywheel to speak of so no way do you have a warped flywheel.. you do have a clutch pack in a clutch basket.... shuddering on a Concourse can mean the clutch plates are burnt and warped.. Unless this bike was drag raced I doubt that your clutch plates are that bad... but it is possible. On the center stand with the engine off and in neutral... how does the back wheel feel when you turn it by hand... no rear brake dragging? no wobble or play in the rear wheel bearings..no binding? I am thinking you going to have to inspect your clutch pack unless some else has more ideas.I am completely uneducated when it comes to the clutch assembly of this bike (Obviously). No wobble, no binding. The previous owner probably did a lot of slow work (law enforcement stuff) on the clutch, which could get it hot. I never asked him about it as it hasn’t been an issue for me these last 20k miles. I just thought it was inherent with this bike until I rode my friend’s ‘11 and thought “Wow! This clutch is smooth!”. Maybe I’ll replace it down the road if it ever worsens, but I’ll most likely wait until it’s shot.
Sorry I did not post the outcome on my clutch. I see people are still replying. I rebuilt the clutch with a kit from Myrphs. Installed new star springs, friction disk and coil springs. Works like new. Every thing looked like new except the star springs had a few fractures, but were in tack. The friction disks were only worn a few thousands. I am thinking one or more of the coil springs were weak and causing uneven pressure. Thanks for all the help.If you had a crack in one of the star springs.. just one crack.. the clutch pack will bounce back and forth when you are trying to slip the clutch on purpose. That was your problem... cracked star spring.