If you want to carry out auto repairs to your Beta Eikon 4T 125 then it is always recommended to have access to a Workshop Manual to keep just for a reference in the event you need to know how to strip off a particular part much like the Drive Shaft and match it again adequately.
Beta Eikon 4T 125 Workshop Manuals will give detailed diagnostic information on your car therefore if something is faulty it will help you work out what the situation is and the best way to fix it. After that you can evaluate if this can be achieved yourself or if ever the job is too big you can actually make a booking for your Eikon 4T 125 right into a local friendly mechanic.
Beta Eikon 4T 125 manual