If you need to execute maintenance on your own Gilera Nordwest then it is usually recommended to possess a Workshop Manual to use as reference just in case you need to know how you can take off a certain component for example, the Wheel Bearing and fit it again in the correct way.
Gilera Nordwest Workshop Manuals will give you exact diagnostic guidelines with regards to your car or truck therefore if something is faulty it helps you figure out what the issue is and the way to make it better. Then you are able to analyse if this can be achieved by yourself or in case the job is simply too big you could make a booking for your Nordwest in to a decent friendly mechanic.
Gilera Nordwest manual