If you wish to undertake maintenance tasks to your Hercules K 125 then it is always a great idea to own a Workshop Manual for reference should you need to know easy methods to take out a specific part for example, the Drive Shaft and install it again appropriately.
Hercules K 125 Workshop Manuals provide you with certain diagnostic details for your vehicle therefore if something is not working it can help you find out what the issue is and ways to make it better. You will be able to evaluate if this can be done by yourself or that the job is just too big you can book your K 125 in with a suitable mechanic.
Hercules K 125 manual