If you wish to accomplish adjustments to your Hyosung GT 250 EFI then it is always recommended to possess a Workshop Manual to use as a guide in the event that you need to know tips to remove a certain component for instance the Brake Discs and install it again in the correct way.
Hyosung GT 250 EFI Workshop Manuals will give unique diagnostic guides for the automobile so if something is broken it will help you determine what the situation is and how to resolve it. After that you can determine if this can be achieved yourself or in case the job is simply too big you can make a booking for your GT 250 EFI into a suitable garage.
Hyosung GT 250 EFI manual