If you need to conduct repairs on your own Kawasaki Z 550 GT then it is usually a great idea to possess a Workshop Manual to use as reference just in case you need to know techniques to take off a specific part for example, the Gearbox and fit it again efficiently.
Kawasaki Z 550 GT Workshop Manuals are able to offer specified diagnostic info for the vehicle therefore if something is not working it will help you identify what the situation is and some ways to repair it. You can then assess if this can be done on your own or if the job is simply too big you can book your Z 550 GT in to a nearby garage.
Kawasaki Z 550 GT manual