1980 Yamaha XS400 Service and Repair Manual

For 1980 the XS400 carried the model code XS400G. Yamaha's service coverage for it sits in the volume numbered LIT-11616-XS-42, one book that the factory kept in print across model years 1976 to 1982 and extended to the XS360 and XS400 SPECIAL II as well.

Trims and codes covered

Because several machines share the pages, the specification tables are organised by code. Matching XS400G to the column you are reading is the step that keeps a clearance or torque figure honest, so it is worth doing before the first fastener comes loose.

The procedures themselves are factory work instructions: cylinder head and crankcase service, clutch and gearbox, front and rear suspension, brakes, carburetor synchronising, valve clearance, ignition timing, charging system testing. Wiring diagrams are drawn to the harness rather than simplified, which is what makes an intermittent fault traceable.