2026 Yamaha YZ450F Service and Repair Manual
The 2026 YZ450F, coded YZ450FTL, is covered by LIT-11626-39-20, a book Yamaha also wrote for the YZ450F 70th Anniversary Edition.
Engine chapters follow the order of the work: valve clearance and shim tables, camshaft timing, cylinder head and piston service with wear limits, clutch replacement, then the cases split for crank and gearbox. Injection and ignition sections carry the factory test values for tracing a starting or running fault.
Beyond that, the book documents fork and shock service with oil quantities, brake and wheel procedures, bearing replacement, and the torque tables for frame, swingarm and engine mounts. Wiring diagrams and diagnostic charts are included.
Check fitment against the frame sticker first. The code YZ450FTL, read together with LIT-11626-39-20, is how Yamaha identifies this literature, and it takes less time to confirm than to correct.