If you choose to undertake adjustments on your own Derbi Atlantis Bullet 2t then it is usually a good plan to have a Workshop Manual to use as a reference should you need to know how to strip off a particular part such as the Clutch and match it again in the correct way.
Derbi Atlantis Bullet 2t Workshop Manuals gives you precise diagnostic information with regards to your car so if something is broken it can help you figure out what the problem is and the best way to fix it. You will be able to decide if this can be achieved yourself or in case the job is just too big it is possible to make a booking for your Atlantis Bullet 2t in to a decent friendly mechanic.
Derbi Atlantis Bullet 2t manual