If you have to execute fixes on your own Hyosung RX 125D E then it is usually a good plan to own a Workshop Manual to use as reference if perhaps you want to know simple methods to remove a particular component for example Drive Shaft and match it again successfully.
Hyosung RX 125D E Workshop Manuals will give you specific diagnostic wisdom with regards to your car so if something is broken it will help you ascertain what the problem is and methods to make it better. You will be able to assess if you can do this yourself or if ever the job is too big you could book your RX 125D E into a nearby car garage.
Hyosung RX 125D E manual