2021 Yamaha YZ125 Service and Repair Manual

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2021 was a significant season for the YZ125, and Yamaha issued a service manual specific to it: part number LIT-11626-34-27, for the machine built as model code YZ125M2.

Because the book is written for the one model year, nothing in it has to be qualified. Torque figures, clearances, maintenance intervals and adjustment procedures all belong to this bike. The manual runs from routine service through full engine and chassis disassembly, with inspection steps that name the measurement and give the limit, and it closes out the electrical side with the wiring diagram as built.

Owners who jetted, revalved or rebuilt before reading the factory figures usually end up reading them afterwards. Starting here saves the second attempt. Confirm YZ125M2 on the frame label so you know you have the right volume.

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