If you choose to do maintenance on your Kawasaki KZ 650 then it will always be recommended to have access to a Workshop Manual to use as a reference just in case you need to know techniques to strip off a certain part for example Wheel Bearing and fit it again accordingly.
Kawasaki KZ 650 Workshop Manuals will give you specified diagnostic info on your automobile therefore if something is not working it helps you determine what the issue is and the way to repair it. After that you can assess if this can be done on your own or in the event the job is too big you are able to make a reservation for your KZ 650 into a suitable repair garage.
Kawasaki KZ 650 manual