1992 Yamaha RAZZ Service and Repair Manual

Model code SH50D identifies the 1992 RAZZ, and the factory repair information for it lives in LIT-11616-05-80 — the single Yamaha volume written to serve every RAZZ built between 1987 and 2001.

That wide coverage is useful in practice. A scooter this old has often collected parts from neighbouring years, and the book gives you the reference points to sort out what you actually have: specification tables, assembly sequences with the correct order of operations, torque figures, and the wiring diagrams needed to trace a circuit rather than guess at it. Troubleshooting sections work from the symptom backwards, which is how most RAZZ jobs start.

Before you buy, confirm the SH50D code against the frame. Yamaha's own literature number, LIT-11616-05-80, is the other half of that confirmation, and it is printed on the book itself so there is no ambiguity about which service publication you are looking at.