If you want to accomplish maintenance on your own Aprilia TXR 312 M then it is always recommended to have access to a Workshop Manual to keep just for a reference in case that you need to know tips on how to take out a certain part for example, the Exhaust and fit it again adequately.
Aprilia TXR 312 M Workshop Manuals provide you with unique diagnostic information on your car so if something is faulty it will help you determine what the issue is and the best way to correct it. You will be able to decide if this can be done yourself or if the job is too big you can book your TXR 312 M into a local mechanic.
Aprilia TXR 312 M manual