If you choose to undertake maintenance tasks on your own Gilera XRT 600 then it is usually a good idea to own a Workshop Manual to keep just for personal reference if you want to know simple methods to take off a certain part such as the Clutch and install it again effectively.
Gilera XRT 600 Workshop Manuals offers you specific diagnostic guides with regards to your car therefore if something is not working it can help you identify what the issue is and the best way to repair it. After that you can decide if you can do this by yourself or in case the job is simply too big you can still book your XRT 600 in to a decent garage.
Gilera XRT 600 manual