If you have to perform maintenance tasks to your Suzuki DR Z400S then it is always recommended to own a Workshop Manual to keep just for a guide just in case you need to know simple methods to strip off a specific part for example, the Wheel Bearing and match it again appropriately.
Suzuki DR Z400S Workshop Manuals will give you special diagnostic guidelines on your car so if something is playing up it helps you identify what the issue is and some ways to fix it. You can then decide if this can be achieved by yourself or in case the job is simply too big it is possible to make a reservation for your DR Z400S in with a suitable repair garage.
Suzuki DR Z400S manual