If you have to conduct repairs on your own TGB 303R 125 then it will always be recommended to have access to a Workshop Manual to use as a reference in case that you need to know ways to take out a specific part for instance the Wheel Bearing and install it again efficiently.
TGB 303R 125 Workshop Manuals gives you certain diagnostic details with regards to your car or truck therefore if something is wrong it can help you ascertain what the problem is and ways to make it better. You can then analyse if this can be achieved on your own or if ever the job is simply too big you can make a booking for your 303R 125 right into a local garage.
TGB 303R 125 manual