Use locktight on ALL nuts & bolts. Pull every nut & bolt you can access and dab a drop on every last screw, then reassemble. These china girls vibrate something fierce at high RPMs and WILL rattle the fasteners loose. I've had parts literally fall of my bike as I have ridden it, so do yourself a favor, listen to those of us who have been through this before, use locktight. You can find it in most auto parts stores. Use the blue type, as the red is intended for internal motor parts not intended to be loosened or removed and often requires heat to get them apart for service.
By the holy power of Love, Life & Laughter, I commend you to Go Forth & Be Awesome!