If you need to undertake repairs for your Gilera Runner ST 125 then it is always a good idea to own a Workshop Manual for personal reference in case you need to know ways to take out a specific part such as the Drive Shaft and match it again correctly.
Gilera Runner ST 125 Workshop Manuals will give detailed diagnostic wisdom for the car or truck therefore if something is playing up it can help you ascertain what the situation is and tips on how to resolve it. You can then analyse if this can be achieved by yourself or if the job is too big you are able to make a reservation for your Runner ST 125 in to a nearby friendly mechanic.
Gilera Runner ST 125 manual