If you choose to do adjustments on your own Kymco Activ 125 then it will always be a good plan to own a Workshop Manual for personal reference in case that you need to know ways to strip off a particular component like the Brake Discs and match it again in the right way.
Kymco Activ 125 Workshop Manuals provides identifiable diagnostic information for the car therefore if something is playing up it helps you understand what the situation is and how you can resolve it. You will be able to decide if this can be achieved yourself or that the job is just too big it is possible to book your Activ 125 into a nearby repair garage.
Kymco Activ 125 manual