If you have to conduct adjustments on your Sym XS125 K then it is usually a great idea to have access to a Workshop Manual to use as a reference just in case you want to know easy methods to take off a specific component for example the Brake Discs and match it again effectively.
Sym XS125 K Workshop Manuals will provide you with specified diagnostic details with regards to your vehicle therefore if something is faulty it will help you discover what the problem is and how to fix it. You will be able to evaluate if you can do this yourself or if the job is too big you can book your XS125 K in with a nearby friendly mechanic.
Sym XS125 K manual