If you have to accomplish fixes to your Derbi Senda R DRD Racing then it is always a good plan to have a Workshop Manual to use as a guide in case that you need to know easy methods to strip off a specific component for example Gearbox and fit it again appropriately.
Derbi Senda R DRD Racing Workshop Manuals will give specific diagnostic info for the automobile therefore if something is broken it can help you work out what the issue is and tips on how to repair it. You can then evaluate if you can do this yourself or if the job is just too big you are able to book your Senda R DRD Racing in to a local car garage.
Derbi Senda R DRD Racing manual