If you want to execute auto repairs for your Yamaha RD 125 LC then it is always recommended to possess a Workshop Manual to use as a reference in the event that you need to know tips to take out a certain component for example the Exhaust and fit it again the right way.
Yamaha RD 125 LC Workshop Manuals offers you exact diagnostic facts for the vehicle so if something is faulty it can help you work out what the issue is and easy methods to fix it. You will be able to evaluate if this can be done yourself or if ever the job is too big you can book your RD 125 LC into a decent mechanic.
Yamaha RD 125 LC manual