If you need to conduct maintenance tasks on your own Kawasaki ZZR 600 then it is always recommended to have a Workshop Manual to keep just for personal reference should you need to know methods to take off a certain component for instance the Door and match it again accordingly.
Kawasaki ZZR 600 Workshop Manuals provides specified diagnostic wisdom for your vehicle so if something is not working it will help you ascertain what the situation is and how to resolve it. You can then evaluate if this can be done on your own or that the job is too big you could make a reservation for your ZZR 600 in to a local garage.
Kawasaki ZZR 600 manual