Yamaha TZR 125 Workshop Manuals
If you need to do adjustments on your own Yamaha TZR 125 then it will always be a good plan to own a Workshop Manual to keep just for a reference if you want to know the right way to take off a particular component such as the Transmission and install it again the right way.
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Yamaha TZR 125 Workshop Manuals can provide targeted diagnostic info with regards to your motorbike so if something is broken it can help you understand what the situation is and how you can resolve it. You can then assess if you can do this yourself or if the job is just too big you can make a reservation for your TZR 125 into a nearby mechanic.