If you want to accomplish maintenance on your own Suzuki RV 125 then it will always be recommended to own a Workshop Manual for a reference should you need to know tips to remove a particular component for example, the Wheel Bearing and match it again correctly.
Suzuki RV 125 Workshop Manuals will give particular diagnostic guides on your car so if something is not working it will help you discover what the issue is and how you can correct it. Then you are able to assess if this can be achieved yourself or in the event the job is simply too big you could make a booking for your RV 125 right into a local mechanic.
Suzuki RV 125 manual