If you need to execute fixes for your Puch 125 GS then it is always recommended to own a Workshop Manual to keep just for a reference in case that you need to know how you can take out a particular component for example the Brake Pads and match it again accurately.
Puch 125 GS Workshop Manuals provide you with precise diagnostic information with regards to your vehicle therefore if something is not working it helps you identify what the situation is and easy methods to resolve it. You can then assess if this can be done by yourself or that the job is too big you can make a reservation for your 125 GS in with a trusted friendly mechanic.
Puch 125 GS manual