Fired up the red Tornado on the weekend and noticed a bit of a noise from the alternator area at idle. Had a bit of time up my sleeve so I pulled it off and found the pulley on the alternator was loose, had about 6mm end float due to a loose pulley nut. Workshop manual has no end float measurements that I could see, so I tightened it up and reinstalled... Heaps quieter now. Might check the silver bike's alternator this weekend. Has anyone been here before?