If you have to accomplish auto repairs on your Hyosung GT125R then it is always a good idea to have a Workshop Manual to keep just for reference in the event you need to know the right way to take off a specific part including Drive Shaft and match it again accordingly.
Hyosung GT125R Workshop Manuals gives you specific diagnostic info for the automobile so if something is wrong it will help you understand what the problem is and how to correct it. You will be able to assess if this can be achieved yourself or in case the job is too big you are able to make a reservation for your GT125R right into a suitable car garage.
Hyosung GT125R manual