while you are riding at a slow steady pace, let off on the throttle and back on again. try to feel for any steering head free play (sometimes has a clicking sound). be sure you don't have a steering damper attached. once the bearings are damaged, they need to be replaced. don't get OEM (over priced at the dealership, just match the bearing ID and order anywhere online (or local NAPA stores).
I get my bearings in Columbus OH. but i forget the name.
If that is the case, i'll write up simple procedures on installing them (front stands will not work).