If you wish to do maintenance on your own Yamaha RD 80 LC then it is always a good plan to have a Workshop Manual to keep just for a guide just in case you want to know the way to remove a specific part for instance the Wheel and install it again properly.
Yamaha RD 80 LC Workshop Manuals are able to offer particular diagnostic info for your automobile so if something is wrong it helps you identify what the issue is and some ways to resolve it. You will be able to evaluate if you can do this yourself or if ever the job is too big it is possible to make a booking for your RD 80 LC in to a suitable repair garage.
Yamaha RD 80 LC manual