If you need to undertake maintenance tasks on your own Hyosung GT 250 EFI then it is always a great idea to own a Workshop Manual to use as personal reference in the event that you want to know how to strip off a particular part for example, the Clutch and fit it again safely.
Hyosung GT 250 EFI Workshop Manuals will give you special diagnostic guidelines with regards to your car therefore if something is wrong it can help you work out what the situation is and how you can repair it. You can then evaluate if you can do this on your own or if ever the job is too big you can actually book your GT 250 EFI in to a nearby friendly mechanic.
Hyosung GT 250 EFI manual