If you choose to accomplish auto repairs on your Aprilia Scarabeo 100 4S then it is usually recommended to possess a Workshop Manual to use as personal reference if you need to know simple methods to take out a certain component like the Gearbox and install it again in the correct way.
Aprilia Scarabeo 100 4S Workshop Manuals offers clear exact diagnostic wisdom with regards to your car therefore if something is broken it will help you ascertain what the situation is and the way to repair it. You will be able to decide if this can be achieved yourself or in case the job is simply too big you could make a booking for your Scarabeo 100 4S in to a nearby garage.
Aprilia Scarabeo 100 4S manual