If you choose to carry out maintenance to your Hyosung GT650R then it is always recommended to have access to a Workshop Manual to use as a guide in case that you want to know simple methods to take out a specific part for example the Drive Shaft and install it again adequately.
Hyosung GT650R Workshop Manuals gives you identifiable diagnostic guidelines for your automobile so if something is wrong it can help you ascertain what the issue is and how you can resolve it. After that you can decide if you can do this yourself or if the job is just too big you can book your GT650R right into a trusted garage.
Hyosung GT650R manual