If you choose to carry out repairs on your own Suzuki GSX 400 L then it is always a good idea to have access to a Workshop Manual to keep just for reference should you want to know techniques to take off a specific component for instance the Wheel Bearing and install it again in the right way.
Suzuki GSX 400 L Workshop Manuals will give you distinct diagnostic facts on your car so if something is faulty it will help you figure out what the problem is and the best way to make it better. After that you can assess if this can be achieved by yourself or that the job is too big you could make a reservation for your GSX 400 L right into a local garage.
Suzuki GSX 400 L manual