If you want to do repairs on your own Daelim S2 125 FI then it is usually a good idea to have a Workshop Manual to keep just for reference in case you need to know tips on how to take out a particular component like the Drive Shaft and install it again perfectly.
Daelim S2 125 FI Workshop Manuals can provide certain diagnostic information on your vehicle so if something is broken it helps you ascertain what the problem is and how to resolve it. After that you can evaluate if you can do this by yourself or if the job is too big you can still book your S2 125 FI right into a trusted car garage.
Daelim S2 125 FI manual