2025 Yamaha YZ450F Service and Repair Manual

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Yamaha assigned LIT-11626-38-16 to the 2025 YZ450F, model code YZ450FSL, and used the same volume for the YZ450F Monster of that year.

Owners working on the engine get valve clearance measurement with shim selection, cam timing, head and piston service against the stated limits, clutch replacement, and a full crankcase rebuild including transmission work. Fuel injection and ignition chapters give sensor test values and a logical order for diagnosis, which matters more than any single specification when a bike runs poorly.

The chassis half covers fork and rear shock teardown with the specified oil volume, brake and wheel service, bearing replacement and the torque figures for frame and engine hardware. A complete wiring diagram with troubleshooting sequences closes the book.

Confirm YZ450FSL on the frame label before ordering, especially if the bike wears bodywork from another year.

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