If you need to execute auto repairs on your own Kawasaki EN 400 Vulcan then it will always be a good plan to own a Workshop Manual to keep just for a guide in the event you want to know the right way to strip off a particular component including Drive Shaft and fit it again properly.
Kawasaki EN 400 Vulcan Workshop Manuals will give you unique diagnostic guides with regards to your vehicle so if something is not working it can help you ascertain what the situation is and some ways to fix it. You will be able to analyse if this can be done yourself or that the job is too big you could make a reservation for your EN 400 Vulcan in with a trusted car garage.
Kawasaki EN 400 Vulcan manual