My first post on ADVrider!.
My 1150 sounds just like that as well.
On centrestand,gear engaged,let out clutch.Bag of spanners in the washing machine.
What does it sound like when you ride it normally on the street?.Is it the same?.Mine sounds normal under these circumstances.
I have been told that the angle of the drive shaft when on the stand is too much and it creates noise.That and the motors power pulses thru the transmission when its unloaded cause vibration.Good luck with it.