Model code AT2, 1971, and a factory service manual carrying Yamaha part number LIT-11613-14-01. Those three details are what a buyer needs to confirm fitment before anything else.
Yamaha issued this volume for the 1971 to 1973 model years and listed a group of related small two-strokes in it: the AT1, AT3, CT1, CT1C, CT2, CT3, LT2 and LT3 share the book with the AT2. Where a specification or procedure differs between them, the text identifies the model it applies to.
The chapters follow shop practice. Periodic maintenance, engine and transmission overhaul with clearance limits, carburettor and ignition adjustment figures, torque tables, complete wiring diagrams, and troubleshooting arranged by symptom. On a bike this old the diagrams and measured limits do most of the work, particularly when previous owners have substituted parts.
