If you choose to execute fixes on your own Derbi Mulhacen 125 then it is usually recommended to have access to a Workshop Manual to keep just for a guide if perhaps you need to know the right way to remove a specific component such as the Gearbox and match it again in the right way.
Derbi Mulhacen 125 Workshop Manuals provides targeted diagnostic facts on your car or truck so if something is playing up it can help you figure out what the situation is and the best way to resolve it. You will be able to analyse if this can be done yourself or in the event the job is too big you can still book your Mulhacen 125 in to a trusted car garage.
Derbi Mulhacen 125 manual