If you need to do fixes on your own MBK Cityliner 125 then it is always recommended to have a Workshop Manual for personal reference in the event that you want to know easy methods to take off a specific part including Clutch and install it again in the right way.
MBK Cityliner 125 Workshop Manuals offers you specified diagnostic guidelines with regards to your car so if something is broken it can help you understand what the problem is and how to resolve it. After that you can analyse if this can be done on your own or if ever the job is too big you could make a reservation for your Cityliner 125 right into a nearby friendly mechanic.
MBK Cityliner 125 manual