If you want to undertake maintenance tasks on your own Rieju Tango 125 then it is usually a good plan to own a Workshop Manual to keep just for reference just in case you need to know tips on how to remove a certain component for example, the Brake Discs and fit it again accordingly.
Rieju Tango 125 Workshop Manuals provides distinct diagnostic wisdom for the car or truck so if something is broken it will help you understand what the issue is and tips to resolve it. You will be able to evaluate if this can be done yourself or if ever the job is simply too big you could make a booking for your Tango 125 in to a trusted mechanic.
Rieju Tango 125 manual