If you choose to undertake maintenance tasks for your Kawasaki ZX 9R Ninja then it will always be a great idea to possess a Workshop Manual to use as reference in case that you need to know the way to take out a specific part for example, the Wheel and match it again correctly.
Kawasaki ZX 9R Ninja Workshop Manuals are able to offer particular diagnostic guidelines on your car therefore if something is faulty it helps you work out what the issue is and how to repair it. After that you can assess if you can do this by yourself or in case the job is too big you can actually make a reservation for your ZX 9R Ninja into a decent friendly mechanic.
Kawasaki ZX 9R Ninja manual