If you wish to conduct fixes on your own Hyosung GT650R TTC then it is always recommended to possess a Workshop Manual to keep just for personal reference if perhaps you want to know the way to remove a particular component such as the Wheel and fit it again perfectly.
Hyosung GT650R TTC Workshop Manuals will give detailed diagnostic information for the car therefore if something is broken it can help you identify what the issue is and how to fix it. You can then assess if this can be achieved on your own or that the job is simply too big you can make a reservation for your GT650R TTC in with a trusted garage.
Hyosung GT650R TTC manual