1980 Yamaha YZ125 Service and Repair Manual

LIT-11626-02-05 is the service manual Yamaha published for the 1980 YZ125, model code YZ125G. Unlike the previous year's volume it stands alone, covering the one model year without sharing pages with another machine.

A year-specific book is the easier one to work from. Every setting printed applies to the bike you are holding a spanner over, with no cross-references to sort out. Coverage takes in engine disassembly and assembly in sequence, inspection against printed wear limits, torque specifications, ignition timing, carburation, suspension figures and the electrical system with its diagram.

The YZ line changed fast in these years, and a manual from an adjacent season will give you numbers that no longer apply. Read the code off the frame label and confirm it says YZ125G before you order.