If you want to carry out maintenance on your Hercules K 125 S then it is always a great idea to own a Workshop Manual to use as a guide if you need to know ways to take off a specific part for example the Exhaust and fit it again correctly.
Hercules K 125 S Workshop Manuals offer you specific diagnostic facts for your vehicle so if something is not working it can help you ascertain what the situation is and the way to resolve it. You can then analyse if you can do this on your own or if the job is too big you can actually make a reservation for your K 125 S in with a suitable repair garage.
Hercules K 125 S manual