A standup from 1992 needs the book written for it that year. LIT-18616-00-77 is Yamaha's service manual for the SuperJet, model code SJ650Q, and its coverage is the 1992 model year alone, with no later revisions folded in and no other models sharing the pages.
It handles the craft as a whole: engine disassembly with the clearances that decide what gets replaced, carburetor and fuel system service, jet pump and driveshaft work, ignition and electrical testing, and the hull and pole hardware. Torque figures accompany the procedures, and the wiring is diagrammed as built.
On a craft this old the specification tables are the point. Verify SJ650Q on the plate before you trust a number to a rebuild.
Illustrations throughout are the factory line drawings, and special tools are named where one is required.
