If you choose to execute maintenance tasks to your Xmotos XB 21 then it is always a good plan to have a Workshop Manual to keep just for personal reference in case that you need to know tips to strip off a specific component for instance the Exhaust and fit it again the right way.
Xmotos XB 21 Workshop Manuals will give specific diagnostic details for the automobile so if something is wrong it will help you figure out what the issue is and some ways to fix it. After that you can analyse if this can be achieved yourself or if the job is just too big it is possible to make a booking for your XB 21 into a nearby friendly mechanic.
Xmotos XB 21 manual