If you have to carry out repairs for your Suzuki GSX 400 S then it is always recommended to have access to a Workshop Manual to keep just for personal reference in the event that you want to know how to take out a specific component including Wheel and fit it again perfectly.
Suzuki GSX 400 S Workshop Manuals offer you specified diagnostic details with regards to your car or truck so if something is faulty it will help you discover what the issue is and how to correct it. After that you can analyse if this can be done by yourself or if the job is too big you can still make a booking for your GSX 400 S in to a suitable car garage.
Suzuki GSX 400 S manual