If you want to do maintenance for your Rieju 125 NKD then it is usually a great idea to own a Workshop Manual to use as a reference in case you want to know ways to strip off a particular part for example Drive Shaft and fit it again efficiently.
Rieju 125 NKD Workshop Manuals will give you identifiable diagnostic information with regards to your car or truck therefore if something is playing up it will help you find out what the issue is and some ways to repair it. You will be able to evaluate if this can be done on your own or in the event the job is just too big you can still make a reservation for your 125 NKD in to a trusted mechanic.
Rieju 125 NKD manual