XS400SJ is the code Yamaha assigned the 1982 XS400, and LIT-11616-XS-42 is the part number of the service manual that documents it.
This is the last model year inside a book that runs from 1976, and it shares its pages with the XS360 and the XS400 SPECIAL II. A late machine benefits from that: revisions made over the run are noted against the codes they belong to, so you can see what changed by 1982 rather than working from an early assumption.
Work is described the way the factory sequenced it. Engine removal and rebuild, transmission and clutch, forks, swingarm and wheels, hydraulic and drum brake service, fuel system adjustment, and the electrical chapters with their test values and harness diagrams. Specifications are given as both new dimensions and service limits, which is the pair of numbers that tells you whether a used part goes back in.
