If you want to do fixes to your Moto Morini 400 S then it is always a good plan to own a Workshop Manual to use as reference in case that you need to know tips on how to strip off a specific part for example the Wheel and fit it again in the right way.
Moto Morini 400 S Workshop Manuals offers you detailed diagnostic information with regards to your car or truck so if something is not working it will help you determine what the problem is and how to correct it. Then you are able to evaluate if you can do this on your own or that the job is too big you can actually make a booking for your 400 S into a decent garage.
Moto Morini 400 S manual