If you wish to accomplish repairs for your CSR NKT 125 then it is always a great idea to have access to a Workshop Manual to keep just for reference in case you need to know tips to strip off a specific part much like the Gearbox and install it again correctly.
CSR NKT 125 Workshop Manuals provide you with specified diagnostic info with regards to your automobile so if something is wrong it will help you work out what the problem is and how you can fix it. Then you are able to assess if you can do this yourself or that the job is too big you can still make a reservation for your NKT 125 right into a trusted friendly mechanic.
CSR NKT 125 manual