If you have to conduct fixes for your Hyosung GV125C then it is always a great idea to own a Workshop Manual to keep just for a reference should you need to know simple methods to take out a certain part for example, the Wheel and install it again effectively.
Hyosung GV125C Workshop Manuals will provide you with specific diagnostic information for the vehicle so if something is not working it will help you ascertain what the issue is and ways to fix it. After that you can analyse if this can be achieved by yourself or if the job is just too big you are able to make a booking for your GV125C in to a decent car garage.
Hyosung GV125C manual