If you want to perform maintenance on your own Kymco MXU 400 then it is usually a good idea to have a Workshop Manual for reference in case you want to know how you can strip off a specific part for example, the Gearbox and fit it again effectively.
Kymco MXU 400 Workshop Manuals provides specific diagnostic info for your car therefore if something is faulty it helps you discover what the situation is and easy methods to repair it. You can then evaluate if this can be done on your own or in the event the job is just too big you could make a booking for your MXU 400 into a decent friendly mechanic.
Kymco MXU 400 manual