If you want to conduct fixes for your Gilera Runner SC 50 then it will always be a good plan to have a Workshop Manual to keep just for a reference should you want to know tips to remove a specific component for instance the Exhaust and match it again in the right way.
Gilera Runner SC 50 Workshop Manuals will provide you with distinct diagnostic wisdom for your car so if something is not working it can help you identify what the problem is and ways to correct it. After that you can analyse if you can do this yourself or in case the job is just too big you are able to book your Runner SC 50 in with a decent garage.
Gilera Runner SC 50 manual