If you want to do auto repairs on your Kawasaki ZXR 250c then it is usually recommended to have access to a Workshop Manual to keep just for personal reference in case you want to know easy methods to take out a particular part such as the Exhaust and fit it again effectively.
Kawasaki ZXR 250c Workshop Manuals can offer you certain diagnostic info with regards to your car or truck so if something is playing up it will help you figure out what the problem is and how to correct it. Then you are able to evaluate if you can do this by yourself or in case the job is just too big you can actually book your ZXR 250c into a decent friendly mechanic.
Kawasaki ZXR 250c manual