If you want to accomplish repairs for your Sym XS125G then it is usually a great idea to own a Workshop Manual to use as reference just in case you want to know simple methods to take off a specific component much like the Drive Shaft and match it again in the right way.
Sym XS125G Workshop Manuals offers clear certain diagnostic details on your car so if something is playing up it can help you understand what the situation is and the best way to repair it. You can then decide if this can be done by yourself or in case the job is simply too big you are able to make a reservation for your XS125G right into a suitable mechanic.
Sym XS125G manual