1981 Yamaha MX80 Service and Repair Manual

The 1981 MX80 carries the code MX80H, and Yamaha wrote a dedicated service volume for it under part number LIT-11626-02-50.

Coverage stops at the 1981 model year. Yamaha issued separate references for the MX80 as it changed, which means the specifications here belong to this season alone and are not averaged across a longer run.

Content is factory service material. You get the sequence for stripping and reassembling each major assembly, torque values for the fasteners involved, clearances and adjustment settings expressed as measurements, wiring diagrams for the electrical circuits, and troubleshooting organised around symptoms.

Small bikes like this often change hands with no service history at all, which is exactly when the factory numbers earn their place. Confirm MX80H on the machine, then quote LIT-11626-02-50 when you need to be sure which volume applies.