Work on a 1972 CT3 starts with the right book, and that is Yamaha LIT-11613-14-01. The model code is CT3.
Coverage spans 1971 to 1973 and includes the AT1, AT2, AT3, CT1, CT1C, CT2, LT2 and LT3. One volume, nine machines, with model-specific notes where the procedures part company.
The material is Yamaha's own dealer content: engine and gearbox teardown sequence, service limits and clearances, carburettor and ignition settings, torque specifications, complete wiring diagrams and troubleshooting tables. Nothing about it is written to impress; it is written to be used with the bike in pieces. Confirm the CT3 code stamped on your frame against the fitment list before you begin.
