If you need to do maintenance tasks on your Hyosung GT125R TTC then it is always a good idea to have access to a Workshop Manual for personal reference should you need to know the best way to take out a specific part like the Gearbox and fit it again accurately.
Hyosung GT125R TTC Workshop Manuals gives you detailed diagnostic info with regards to your automobile therefore if something is not working it helps you discover what the situation is and methods to make it better. You can then determine if this can be done on your own or in case the job is just too big you are able to make a booking for your GT125R TTC into a decent mechanic.
Hyosung GT125R TTC manual