1971 Yamaha CT1C Service and Repair Manual

Model code CT1C on a 1971 machine points to Yamaha part number LIT-11613-14-01 for service information.

That manual was written across the 1971, 1972 and 1973 model years, and its fitment list runs AT1, AT2, AT3, CT1, CT2, CT3, LT2 and LT3 in addition to the CT1C. Yamaha treated these bikes as a single service family because they share so much of their engine and chassis design, and the book handles the exceptions with model callouts.

Inside is the workshop material a rebuild needs: teardown sequence, wear limits and clearances to measure against, carburettor and ignition specifications, assembly torque figures, full wiring diagrams, and troubleshooting arranged by symptom. Verify the code on your frame first so you are reading the right notes.