If you need to execute adjustments on your Kawasaki Ninja ZX 6R then it is usually recommended to own a Workshop Manual to use as reference should you want to know tips on how to take out a certain part for example Drive Shaft and install it again properly.
Kawasaki Ninja ZX 6R Workshop Manuals can provide unique diagnostic guides for the automobile so if something is playing up it helps you identify what the situation is and how to make it better. You can then decide if this can be achieved yourself or that the job is simply too big you could make a booking for your Ninja ZX 6R right into a trusted mechanic.
Kawasaki Ninja ZX 6R manual