If you need to conduct adjustments for your Beta Rev 50 then it will always be a good plan to have access to a Workshop Manual to keep just for personal reference just in case you want to know how you can take out a certain component for instance the Wheel Bearing and match it again properly.
Beta Rev 50 Workshop Manuals can offer you exact diagnostic guides for the vehicle so if something is faulty it helps you figure out what the problem is and ways to correct it. You can then analyse if this can be done by yourself or that the job is simply too big you can actually make a reservation for your Rev 50 in with a trusted garage.
Beta Rev 50 manual