If you want to undertake maintenance tasks on your Derbi GP1 Racing 50 then it will always be a good plan to possess a Workshop Manual to keep just for a reference just in case you need to know methods to take off a specific part for example Drive Shaft and install it again successfully.
Derbi GP1 Racing 50 Workshop Manuals can offer you specified diagnostic guidelines for your car therefore if something is broken it will help you discover what the problem is and ways to correct it. After that you can analyse if you can do this on your own or that the job is too big you can make a reservation for your GP1 Racing 50 into a nearby car garage.
Derbi GP1 Racing 50 manual