I'm having a vibration issue with my 2016 1250. It's got about 12k on the clock and it started at about 8k. It does it on the centerstand or on the road. It's the whole bike, footpegs , bars, seat etc. I've put new plugs, cleaned the air fllter, synched the throttle bodies a couple of times. Been over the whole bike trying to find something loose. Re-torqued the engine mounting bolts a couple of times and done all I can do and still can't find the cause. I see that there is an external adjustment for the balance shaft, anyone done this? Any ideas appreciated.