1982 Yamaha TT250 Service and Repair Manual
Last of the three, the 1982 TT250 wears the code TT250J and shares its service reference with the two years before it. Yamaha's part number is LIT-11616-01-92.
One volume covering 1980 through 1982 is a small mercy for anyone keeping a machine like this on the trail. Parts get swapped between years, and when a previous owner has mixed components, the specifications for whichever part you are holding are still within reach.
The document is the dealer original. Engine teardown and reassembly, inspection limits, torque values, fuel and ignition settings, suspension and brake work, and Yamaha's own wiring drawings. Nothing has been modernised or summarised.
Two things to verify: the part number LIT-11616-01-92, and the TT250J code stamped on the frame.