If you choose to do maintenance to your Honda CB 400 Super Four then it is always recommended to possess a Workshop Manual to use as reference should you need to know simple methods to remove a particular part for example the Dashboard and install it again in the right way.
Honda CB 400 Super Four Workshop Manuals can offer you special diagnostic wisdom for your vehicle so if something is not working it helps you find out what the issue is and how to resolve it. You can then evaluate if you can do this yourself or that the job is just too big you could make a booking for your CB 400 Super Four in with a local mechanic.
Honda CB 400 Super Four manual