If you choose to execute fixes on your Derbi Senda Xtreme 50 SM then it is usually a good plan to own a Workshop Manual for reference just in case you need to know tips to take off a specific component for example, the Drive Shaft and fit it again the right way.
Derbi Senda Xtreme 50 SM Workshop Manuals will give specific diagnostic wisdom for the car or truck therefore if something is broken it can help you ascertain what the issue is and the best way to resolve it. After that you can evaluate if this can be done on your own or if the job is simply too big you could make a booking for your Senda Xtreme 50 SM in to a trusted repair garage.
Derbi Senda Xtreme 50 SM manual