If you choose to accomplish maintenance for your Norton Commando 961 SS then it is usually a good plan to have a Workshop Manual to use as a reference should you need to know simple methods to take out a specific part much like the Exhaust and match it again effectively.
Norton Commando 961 SS Workshop Manuals will give specific diagnostic facts on your car therefore if something is faulty it will help you work out what the problem is and how you can resolve it. You can then assess if you can do this by yourself or if ever the job is too big you can still book your Commando 961 SS in with a suitable mechanic.
Norton Commando 961 SS manual