If you want to do repairs for your Derbi GP1 250 Racing then it will always be recommended to have a Workshop Manual to keep just for a guide in the event you need to know easy methods to take off a specific component for example, the Brake Pads and install it again adequately.
Derbi GP1 250 Racing Workshop Manuals will provide you with specific diagnostic guides for the car or truck therefore if something is playing up it helps you work out what the issue is and ways to fix it. You can then decide if you can do this on your own or if ever the job is just too big you can actually make a booking for your GP1 250 Racing right into a local friendly mechanic.
Derbi GP1 250 Racing manual