The frame code on the 1980 Exciter reads SR250G, and the factory service manual for it is LIT-11616-01-93. That volume is written for the 1980 model year only, so everything in it applies directly to your machine.
Worth knowing about the code: the Exciter and the SR250 designation are the same bike to Yamaha's service department, and the plate on the frame is what the manual indexes against.
Engine sections are laid out in the order the work happens, with the inspection measurements needed to judge wear. Torque specifications are listed. Carburettor and ignition settings are factory values. The chassis chapters cover front and rear suspension, brakes, wheels and steering.
Electrical work is supported by the wiring diagram and the test figures for the components on it, and a troubleshooting section grouped by symptom closes the book.
