2025 Big Bore MX Weapon

The ultimate 450 raises the bar even higher. Building on its best-in-class performance, the YZ450F boasts exceptional power and sharp handling in a compact, lightweight package that makes fast riders even faster.
Featuring a reversed cylinder head layout, forged aluminum piston, titanium valves, lightened crank assembly and dry sump lubrication, the YZ450F’s advanced DOHC four-stroke engine is light, compact and world renowned for its incredibly broad pulling power across the entire rev range.
And like having factory team support in your pocket, Yamaha’s groundbreaking Power Tuner App allows owners to adjust air/fuel mixture and ignition timing to tune engine performance for track conditions, record race log information and monitor a range of data such as maintenance and system diagnosis, engine run time and more.