The last of the three years in this book is 1983, coded XJ550K. Yamaha's publication number remains LIT-11616-XJ-50, the manual issued for the XJ550 from 1981 onward.
Sections cover general specifications, periodic maintenance, engine and transmission overhaul, fuel system, chassis and brakes, and electrical testing with complete diagrams. Torque figures and service limits are tabulated so they can be found mid-job.
Before ordering, confirm that the code on your frame plate reads XJ550K. Owners of a 1981 or 1982 XJ550 are served by this same publication.
Capacities, lubricant grades and the original maintenance intervals are stated in the specification pages, which is the baseline a long-owned bike tends to drift away from. Troubleshooting is arranged by the symptom an owner would report, not by system.
