If you have to execute adjustments for your Aprilia ETX 350 then it will always be a good plan to have a Workshop Manual to keep just for a guide in the event you want to know ways to strip off a particular part much like the Wheel Bearing and fit it again appropriately.
Aprilia ETX 350 Workshop Manuals are able to offer specific diagnostic guides for your car or truck so if something is not working it will help you work out what the problem is and easy methods to repair it. You will be able to evaluate if you can do this on your own or in case the job is too big you could make a reservation for your ETX 350 in with a trusted garage.
Aprilia ETX 350 manual