TOP FEATURES The Ultimate Open Class Cross Country Racer Based on the benchmark-setting YZ450F motocrosser, the YZ450FX is designed to dominate cross country competition. Its lightweight, compact chassis, powerful four-stroke engine, exceptional rider ergonomics, and Yamaha's groundbreaking next-generation Power Tuner app all carry over directly from the class-leading YZ450F. Additional modifications tailored toward enhanced XC performance include a wide-ratio transmission, larger fuel capacity, 18-inch rear wheel, side stand, skid plate, revised ECU and suspension settings, along with a 10mm lower seat height for increased maneuverability in challenging off-road conditions. High Performance 450cc Four-Stroke Engine The YZ450FX's thrilling liquid-cooled DOHC four-stroke engine is renowned for its broad power character and ease-of-use, with ECU settings tailored to enhance both low-end tractability and top-end power. Industry-Leading Yamaha Power Tuner App Like having factory team support in your pocket, Yamaha's groundbreaking next-generation Power Tuner App is even more user-friendly with an intuitive Simple Tuning slide bar for quick engine mapping selections, three-level Traction Control, a lap timer, and helpful engine and suspension tuning guides. Best of all, it's free-of-charge.