If you want to accomplish maintenance tasks to your Sachs VS 125 Roadster then it is usually recommended to have a Workshop Manual for a guide should you want to know the best ways to strip off a particular component for example the Wheel Bearing and fit it again efficiently.
Sachs VS 125 Roadster Workshop Manuals will give unique diagnostic guides with regards to your car so if something is faulty it will help you find out what the problem is and ways to fix it. Then you are able to evaluate if this can be achieved by yourself or if the job is just too big you can actually make a booking for your VS 125 Roadster right into a local car garage.
Sachs VS 125 Roadster manual