If you have to carry out fixes on your own Rieju SMX 50 Pro then it is always recommended to have a Workshop Manual to use as a guide if perhaps you need to know the best ways to take off a specific part for instance the Gearbox and fit it again accurately.
Rieju SMX 50 Pro Workshop Manuals will give you particular diagnostic info on your vehicle therefore if something is broken it helps you determine what the situation is and the way to correct it. Then you are able to evaluate if you can do this by yourself or if the job is just too big you can book your SMX 50 Pro right into a trusted repair garage.
Rieju SMX 50 Pro manual