If you have to conduct maintenance to your Yamaha TW 125 then it is always a good idea to have a Workshop Manual to use as a reference in the event you want to know tips on how to remove a particular part such as the Brake Discs and match it again in the correct way.
Yamaha TW 125 Workshop Manuals offers clear detailed diagnostic guidelines on your car or truck so if something is wrong it will help you work out what the problem is and the best way to repair it. You will be able to determine if this can be done by yourself or in the event the job is just too big you can make a reservation for your TW 125 in with a nearby mechanic.
Yamaha TW 125 manual