If you wish to conduct auto repairs on your Yamaha TZR 50 then it is usually a good plan to own a Workshop Manual for reference in case that you need to know easy methods to take out a certain part much like the Dashboard and install it again properly.
Yamaha TZR 50 Workshop Manuals can offer you specified diagnostic info with regards to your car so if something is playing up it helps you figure out what the issue is and easy methods to resolve it. You can then determine if you can do this yourself or that the job is too big you can actually book your TZR 50 into a decent mechanic.
Yamaha TZR 50 manual