If you wish to do maintenance to your Yamaha Vity 125 then it will always be a good idea to own a Workshop Manual to keep just for personal reference in case that you need to know proven methods to strip off a specific part much like the Door and install it again accurately.
Yamaha Vity 125 Workshop Manuals will give specific diagnostic info for your car or truck so if something is wrong it can help you work out what the issue is and how to correct it. You will be able to evaluate if this can be achieved by yourself or in case the job is too big you are able to book your Vity 125 right into a local car garage.
Yamaha Vity 125 manual