If you want to undertake fixes on your Gilera Zulu 50 then it is usually recommended to have access to a Workshop Manual to keep just for a reference in case that you need to know proven methods to remove a specific component for example Gearbox and match it again in the correct way.
Gilera Zulu 50 Workshop Manuals will give precise diagnostic guidelines on your vehicle therefore if something is wrong it will help you find out what the issue is and ways to fix it. You will be able to analyse if this can be done yourself or in the event the job is simply too big you can book your Zulu 50 into a local car garage.
Gilera Zulu 50 manual