If you have to carry out maintenance tasks for your Hyosung GT650R then it is usually a good plan to own a Workshop Manual to keep just for personal reference in the event you need to know simple methods to strip off a specific component for example, the Drive Shaft and install it again safely.
Hyosung GT650R Workshop Manuals gives you certain diagnostic information for your car or truck so if something is faulty it helps you understand what the situation is and ways to correct it. Then you are able to decide if you can do this on your own or that the job is too big you can actually make a reservation for your GT650R in to a local car garage.
Hyosung GT650R manual