If you wish to carry out adjustments to your Puch 175 GS then it will always be a good plan to have a Workshop Manual to keep just for a reference in case that you want to know easy methods to strip off a particular part for example Gearbox and install it again the right way.
Puch 175 GS Workshop Manuals can provide unique diagnostic details for the vehicle therefore if something is faulty it can help you find out what the issue is and methods to make it better. You will be able to assess if this can be done by yourself or in the event the job is simply too big you can still book your 175 GS into a trusted friendly mechanic.
Puch 175 GS manual