If you need to execute maintenance on your own Kawasaki Z 400 F then it is usually a good idea to have access to a Workshop Manual for personal reference if you want to know ways to strip off a particular part such as the Wheel Bearing and install it again in the right way.
Kawasaki Z 400 F Workshop Manuals will give you exact diagnostic guides on your vehicle therefore if something is broken it can help you understand what the issue is and tips to fix it. After that you can decide if you can do this by yourself or that the job is simply too big you can still book your Z 400 F in with a suitable repair garage.
Kawasaki Z 400 F manual