If you want to perform maintenance for your Kawasaki 400 S 3 Mach II then it is always a good idea to have access to a Workshop Manual to keep just for reference in case you want to know ways to take off a certain component for example, the Gearbox and install it again appropriately.
Kawasaki 400 S 3 Mach II Workshop Manuals offers clear identifiable diagnostic guidelines on your car therefore if something is not working it can help you find out what the issue is and tips to fix it. Then you are able to determine if you can do this yourself or in case the job is just too big you can book your 400 S 3 Mach II in with a local repair garage.
Kawasaki 400 S 3 Mach II manual