If you wish to carry out adjustments on your Hyosung GT 250 R then it is always a good plan to have access to a Workshop Manual to keep just for reference just in case you want to know the way to take out a specific part for instance the Brake Discs and fit it again in the right way.
Hyosung GT 250 R Workshop Manuals gives you distinct diagnostic guidelines with regards to your car or truck therefore if something is playing up it will help you understand what the situation is and the way to repair it. Then you are able to evaluate if you can do this by yourself or if ever the job is too big you could make a reservation for your GT 250 R right into a decent mechanic.
Hyosung GT 250 R manual