If you wish to perform fixes on your own Hyosung GT 650 Comet then it will always be recommended to have access to a Workshop Manual for reference should you want to know techniques to take off a particular component much like the Brake Pads and match it again appropriately.
Hyosung GT 650 Comet Workshop Manuals provides identifiable diagnostic info on your automobile so if something is playing up it will help you ascertain what the issue is and some ways to resolve it. You will be able to decide if this can be done yourself or that the job is too big you can make a reservation for your GT 650 Comet right into a suitable garage.
Hyosung GT 650 Comet manual