If you need to execute fixes for your Xmotos XB 21D then it will always be recommended to possess a Workshop Manual to use as personal reference in the event that you need to know proven methods to take out a particular component for example, the Gearbox and install it again effectively.
Xmotos XB 21D Workshop Manuals will give you particular diagnostic information with regards to your automobile therefore if something is faulty it can help you determine what the problem is and the best way to correct it. After that you can analyse if you can do this by yourself or that the job is just too big you can actually make a booking for your XB 21D into a nearby mechanic.
Xmotos XB 21D manual