If you have to perform adjustments for your Yamaha TT R 125 LLE then it is always recommended to have access to a Workshop Manual to use as reference just in case you want to know tips on how to take out a specific component such as the Wheel Bearing and install it again accordingly.
Yamaha TT R 125 LLE Workshop Manuals will give certain diagnostic guidelines with regards to your car so if something is faulty it helps you identify what the issue is and methods to repair it. After that you can evaluate if you can do this yourself or that the job is just too big you can actually book your TT R 125 LLE in with a trusted friendly mechanic.
Yamaha TT R 125 LLE manual