If you wish to perform repairs on your own Yamaha DT50X then it is usually a great idea to have access to a Workshop Manual to keep just for a reference just in case you want to know the best way to take out a specific component much like the Exhaust and install it again correctly.
Yamaha DT50X Workshop Manuals provides exact diagnostic info for the automobile therefore if something is faulty it can help you discover what the situation is and tips on how to correct it. After that you can assess if this can be done on your own or if ever the job is just too big it is possible to make a reservation for your DT50X in to a decent mechanic.
Yamaha DT50X manual