If you have to carry out adjustments on your own Ducati Monster 900 then it will always be recommended to have access to a Workshop Manual to keep just for a reference in the event you want to know ways to remove a particular part much like the Gearbox and install it again in the correct manner.
Ducati Monster 900 Workshop Manuals will provide you with exact diagnostic wisdom for the car or truck so if something is playing up it will help you determine what the problem is and ways to make it better. You will be able to decide if this can be done on your own or if the job is too big you are able to make a booking for your Monster 900 into a decent repair garage.
Ducati Monster 900 manual