1983 Yamaha YZ80 Service and Repair Manual

Look for LIT-11626-03-79 when you need service information for the 1983 YZ80, the year Yamaha coded YZ80K.

Inside are the original engine figures: piston and bore dimensions, clutch and transmission procedures, case-splitting sequence, carburetor settings and ignition timing. The chassis half covers fork and shock service, wheel and brake work, bearing replacement and the torque values for frame and engine mounting hardware.

Nothing here is guesswork or a later reinterpretation; it is what Yamaha issued for the machine. That matters most on a bike that has been apart several times, where the specified clearance settles an argument the parts themselves cannot. Confirm the frame stamping shows YZ80K, note LIT-11626-03-79 for ordering, and use the diagrams to check whether the bike in front of you is still standard.