If you choose to do auto repairs on your KTM 125 EXC then it is usually a good plan to own a Workshop Manual to use as reference in case that you want to know methods to strip off a certain component much like the Wheel and install it again accordingly.
KTM 125 EXC Workshop Manuals offers clear distinct diagnostic information on your car therefore if something is faulty it can help you understand what the problem is and tips to make it better. You will be able to analyse if you can do this by yourself or in the event the job is too big it is possible to make a reservation for your 125 EXC right into a suitable garage.
KTM 125 EXC manual