CSR Custom 125 Workshop Manuals
If you want to do fixes to your CSR Custom 125 then it is usually recommended to have a Workshop Manual to use as a reference if you want to know how you can strip off a certain part much like the Chain and install it again the right way.
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CSR Custom 125 Workshop Manuals provides specific diagnostic details on your bike so if something is wrong it helps you work out what the issue is and easy methods to make it better. You can then assess if this can be achieved on your own or if ever the job is simply too big you could book your Custom 125 into a nearby repair garage.