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I'm having a hard time imagining the crash bars (or centerstand) have anything to do with vibration.. have you sync'd the throttle bodies or is that a model with single TB?
I have heard certain crash bars act like a tuning fork. I've reached down and grabbed mine and the vibes were hellacious at certain RPM's. BTW, your '14 is either a Special or a Stone. Classics were earlier models- '09-'12?