1973 Yamaha RT3 Service and Repair Manual

By 1973 the RT3 was the last of its line, and the factory never gave it a book of its own. Instead the work goes in LIT-11613-08-01, a single volume written across the 1971, 1972 and 1973 model years. The code stamped on your machine is RT3; match that, and the part number above, and you have the right reference.

Also documented here: DT1, DT2, DT3, RT1 and RT2. That breadth is deliberate. These bikes share a great deal, and Yamaha's technicians wanted one place to look up a bearing fit or an ignition setting regardless of which of the six was on the bench.

What you get is the original engineering content rather than an aftermarket rewrite. Sequenced tear-down and assembly, torque values, running clearances, wiring layout, and the diagnostic order to follow when the bike will not run or will not charge.