If you need to do adjustments on your Suzuki DR Z400SM then it is usually a good plan to own a Workshop Manual to keep just for personal reference in case that you want to know how to remove a particular component much like the Dashboard and fit it again the right way.
Suzuki DR Z400SM Workshop Manuals offers clear distinct diagnostic guidelines for your car so if something is faulty it can help you find out what the problem is and the best way to make it better. You can then assess if this can be done on your own or if the job is simply too big you could make a booking for your DR Z400SM in with a decent car garage.
Suzuki DR Z400SM manual