2021 Yamaha YZ450F Service and Repair Manual

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Two 2021 machines are served by LIT-11626-34-12: the YZ450F, coded YZ450FML, and the YZ450F Monster. Yamaha wrote one book because the service work is the same on both.

Valve clearance measurement and shim tables come first in the engine coverage, then camshaft timing, head and piston service with the stated limits, clutch replacement and a full crankcase and transmission rebuild. The injection and ignition chapters give sensor test values, which is what turns an intermittent misfire into a traceable fault.

Chassis sections cover fork and shock teardown with the specified oil volume, brake and wheel service, bearing replacement, and the torque tables for frame, swingarm and engine mounts. A complete wiring diagram is included.

Confirm YZ450FML on the frame label before ordering; the Monster shares this part number but carries its own code.

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