If you want to carry out fixes to your Suzuki DR 500 S then it will always be a great idea to own a Workshop Manual to use as a reference should you need to know how you can strip off a specific part like the Gearbox and match it again accordingly.
Suzuki DR 500 S Workshop Manuals will give detailed diagnostic info for your car so if something is not working it can help you figure out what the problem is and easy methods to repair it. Then you are able to assess if this can be achieved on your own or in the event the job is too big you can actually make a reservation for your DR 500 S into a local repair garage.
Suzuki DR 500 S manual