If you want to conduct repairs to your Kawasaki Ninja 500 R then it is usually a good idea to own a Workshop Manual to keep just for personal reference just in case you want to know tips on how to remove a specific part for instance the Brake Discs and match it again safely.
Kawasaki Ninja 500 R Workshop Manuals will give you exact diagnostic details with regards to your vehicle so if something is wrong it will help you find out what the issue is and tips to make it better. You will be able to analyse if this can be achieved by yourself or in the event the job is too big you can book your Ninja 500 R in to a nearby friendly mechanic.
Kawasaki Ninja 500 R manual