If you want to conduct fixes on your Hyosung RT 125D then it is always a good idea to own a Workshop Manual to keep just for a reference should you need to know techniques to take out a particular part much like the Door and install it again perfectly.
Hyosung RT 125D Workshop Manuals are able to offer special diagnostic details on your vehicle so if something is wrong it can help you figure out what the issue is and easy methods to make it better. You will be able to decide if you can do this yourself or in the event the job is simply too big it is possible to book your RT 125D right into a trusted mechanic.
Hyosung RT 125D manual