If you want to do repairs to your Yamaha XJ 900 then it is always a good plan to possess a Workshop Manual for personal reference if you want to know how to take off a certain component for example, the Brake Discs and match it again properly.
Yamaha XJ 900 Workshop Manuals will give identifiable diagnostic guides for your vehicle therefore if something is faulty it helps you figure out what the situation is and how to repair it. You can then evaluate if this can be done by yourself or if ever the job is too big it is possible to make a reservation for your XJ 900 in to a local mechanic.
Yamaha XJ 900 manual