Do you happen to notice strange noise on ZX12, the kind of noise produced from vibrating mirror or loosely screwed bodywork component ? I mean like vibtating plastic. I have this kind of irritating stuff when opening throttle from idle and then around 4000-6000 rpm. Visual checking reveals nothing and nothing appears loosely tighten after checks. I can't figure-out what the f*** this is and it strikes my nerves... Any ideas ?