If you wish to undertake repairs to your CSR Custom 250 Twin then it will always be a good plan to have a Workshop Manual to use as reference if you want to know tips to take out a particular part for example Door and match it again in the correct manner.
CSR Custom 250 Twin Workshop Manuals will give targeted diagnostic guidelines with regards to your car so if something is not working it helps you identify what the problem is and some ways to resolve it. Then you are able to assess if you can do this on your own or in the event the job is too big you could book your Custom 250 Twin into a nearby garage.
CSR Custom 250 Twin manual