If you need to undertake maintenance tasks on your own Derbi Supermotard DRD then it is usually a good idea to own a Workshop Manual to use as personal reference in case you need to know easy methods to strip off a particular component for example, the Exhaust and match it again correctly.
Derbi Supermotard DRD Workshop Manuals provides special diagnostic wisdom for the car therefore if something is playing up it helps you discover what the situation is and methods to repair it. You will be able to decide if you can do this yourself or in case the job is simply too big you could make a reservation for your Supermotard DRD in with a suitable repair garage.
Derbi Supermotard DRD manual