1971 Yamaha JT1 Service and Repair Manual

The JT1 of 1971 is documented in LIT-11612-88-99, a factory manual written for that model and year. The frame code is JT1, the same as the model name, which makes fitment unusually simple on a bike of this vintage.

Small machines like this one are often the first thing someone restores, and the factory book is worth having for exactly that reason: it gives the assembly sequence and the numbers instead of leaving them to be worked out.

Engine service runs from removal through inspection to reassembly, with wear limits and torque values. Carburettor and ignition settings are specified. The chassis sections cover suspension, brakes, wheels and controls, and the electrical chapter includes the wiring diagram and the tests that go with it.

A troubleshooting section grouped by symptom finishes the manual.