1981 Yamaha YZ465H Service and Repair Manual

This is the original Yamaha service manual for the 1981 YZ465H, catalogued as LIT-11626-02-62. No model code is listed in Yamaha's record for it and no other year is folded in, so what you have is the literature written for that single machine.

The engine chapters give piston and cylinder dimensions, clutch and gearbox procedures and the order for splitting the cases. Carburetor settings and ignition timing are the factory values, and the chassis sections cover fork and shock service, wheel and brake work, and the fastener torque figures for frame and engine mounts.

On a bike this old the part number is the most reliable identifier there is. Quote LIT-11626-02-62 when you are matching literature to a restoration project, and compare the diagrams against what is actually on the bike before assuming a previous owner left it standard.