Yamaha issued one service book for the RAZZ and kept it in print for fifteen model years, from 1987 through 2001. The 1991 machine, factory code SH50B, is covered inside it under Yamaha part number LIT-11616-05-80. If you are matching paperwork to the scooter in your garage, that code stamped on the frame plate is the thing to check first.
What the book covers
- Periodic maintenance intervals and adjustment procedures
- Engine and transmission work, including tear-down and reassembly sequences
- Torque values for the fasteners that matter
- Wiring diagrams and electrical testing steps
- Troubleshooting charts for starting, running and charging faults
Because one volume spans the whole RAZZ run, you will see notes calling out which years a given part or setting applies to. Read those notes before ordering components; the SH50B differs from later codes in small ways that the text flags where it matters.
