If you have to execute maintenance tasks on your Hyosung GT650R then it is usually a good plan to have a Workshop Manual to keep just for reference if you want to know the way to take off a specific part for example, the Door and fit it again correctly.
Hyosung GT650R Workshop Manuals will give you identifiable diagnostic guides for the vehicle so if something is broken it helps you determine what the situation is and tips to make it better. Then you are able to decide if this can be done by yourself or that the job is simply too big you can actually make a reservation for your GT650R in to a suitable car garage.
Hyosung GT650R manual