If you wish to carry out auto repairs on your own Sachs XTC 125 then it is usually a good idea to have access to a Workshop Manual to keep just for reference in the event you need to know tips to remove a specific part like the Clutch and fit it again the right way.
Sachs XTC 125 Workshop Manuals will provide you with specified diagnostic facts for the vehicle so if something is playing up it can help you understand what the issue is and how you can correct it. You can then decide if you can do this on your own or in case the job is simply too big you are able to make a reservation for your XTC 125 in to a decent friendly mechanic.
Sachs XTC 125 manual