If you have to execute adjustments on your own Generic Soho 125 then it is always a good idea to own a Workshop Manual to use as a reference just in case you need to know ways to remove a certain part like the Drive Shaft and match it again in the correct manner.
Generic Soho 125 Workshop Manuals can provide identifiable diagnostic info for the automobile so if something is playing up it will help you identify what the problem is and tips on how to fix it. You will be able to assess if you can do this yourself or that the job is simply too big you could make a booking for your Soho 125 right into a decent friendly mechanic.
Generic Soho 125 manual