Mine does it when on the brakes over bumps. Not all the time and usally around town, can't say that I've noticed it at speed. Not sure if it's the brake or the forks. Was doing it the other day on the way home from work, said to myself that I'll check that out this weekend, but the other bike needs new tyres fitted 1st.
07 thrux,breathe,Dna airfilter,airbox X restrictor,135 mains,1 shim,tp +3 ignitor,yss emulators,hp springs, Bitubo shocks,pingle steering damper,D9 layflat,3" rise clipons,corbin seat, tt350 taillight,alloy indicators.shorai battery,Changes daily