If you have to carry out fixes on your own Yamaha XJ 400 Seca then it will always be a good plan to have access to a Workshop Manual to keep just for personal reference should you need to know proven methods to strip off a certain component including Drive Shaft and install it again in the right way.
Yamaha XJ 400 Seca Workshop Manuals offers clear targeted diagnostic details for your car or truck so if something is not working it helps you understand what the problem is and easy methods to make it better. You will be able to assess if you can do this yourself or in the event the job is too big you can book your XJ 400 Seca in to a suitable mechanic.
Yamaha XJ 400 Seca manual