Same problem. Had my bearings replaces. But now, the whole front end is vibrating. Used to be handlebars wobbling right & left while travelling at bout 80kmh. Apparently, there is no warranty on the bearings.
The vibrations, I suspect, is either from the front forks or the triple trees, but, same, no warranty even though the bike is only 6 months old and travelled 7000km. Need to fork out bout RM 2000.00 (its about RMB 4000.00) to get it repaired. Either this bike sucks, the parts suck or the mechanic sucks.

Also, the front tires were defective so they replaced it with a 130 instead of a 120. (apparently, no stock for 120 tires), so now, the whole bike feels not road worthy. SIGH, Bad luck for me???