If you need to do maintenance tasks on your Hyosung GT125R TTC then it is always a great idea to own a Workshop Manual to use as personal reference in case that you need to know the right way to take off a specific part for instance the Brake Discs and install it again in the correct way.
Hyosung GT125R TTC Workshop Manuals provide you with targeted diagnostic info for the automobile therefore if something is not working it helps you find out what the issue is and ways to fix it. Then you are able to decide if this can be achieved by yourself or if the job is just too big you are able to book your GT125R TTC right into a local mechanic.
Hyosung GT125R TTC manual