If you need to accomplish fixes on your own Aprilia 125 Classic then it is usually a great idea to possess a Workshop Manual to use as a guide in case that you need to know how to take off a certain part for instance the Gearbox and install it again accordingly.
Aprilia 125 Classic Workshop Manuals provide you with unique diagnostic facts for your vehicle therefore if something is wrong it helps you figure out what the issue is and easy methods to make it better. You will be able to analyse if this can be done yourself or in case the job is simply too big you could make a reservation for your 125 Classic in with a decent repair garage.
Aprilia 125 Classic manual