If you choose to execute adjustments on your own Puch 125 GS then it is usually a good plan to have access to a Workshop Manual for reference if you need to know how you can take off a specific component for example Clutch and install it again in the correct way.
Puch 125 GS Workshop Manuals will provide you with precise diagnostic information for your car therefore if something is faulty it can help you find out what the situation is and tips to correct it. You will be able to decide if this can be done yourself or that the job is too big you can book your 125 GS right into a decent repair garage.
Puch 125 GS manual