1983 Yamaha TRI-MOTO 125 Service and Repair Manual

Model code YT125K identifies the 1983 Tri-Moto 125. Its factory service manual is LIT-11616-YT-02, the same book Yamaha used for the 1982 through 1985 machines.

One volume across four years means the tables are keyed by year and code, and it also means you can see how the machine was revised over its life. When a previous owner has fitted a part from an adjacent season, that context saves a lot of measuring.

Content follows the usual factory order. General information and routine service come first, then engine overhaul with the measurement points, wear limits and torque sequences, then the fuel and ignition specifications, then electrical testing with the readings Yamaha expects. The chassis chapters handle steering, suspension, wheels and brakes. Wiring diagrams and symptom-led troubleshooting finish it.

Verify YT125K against the frame, keep LIT-11616-YT-02 noted for parts conversations, and work to the printed figures.