The 2026 Yamaha YZ250FX is powered by a 250 cc liquid-cooled single-cylinder 4-stroke DOHC engine with four titanium valves featuring Mikuni electronic fuel injection with 44 mm throttle body, electric start, 6-speed wide-ratio transmission, wet multi-plate clutch, and chain final drive delivering strong cross-country racing performance and precise throttle response. The chassis features a lightweight aluminum bilateral beam frame designed for excellent balance between stability and cornering performance. Suspension includes fully adjustable KYB Speed Sensitive System front forks providing Approx. 300 mm travel and a KYB rear monoshock with linkage delivering Approx. 306 mm travel for superior off-road control. Braking is handled by a 270 mm hydraulic front disc brake and 240 mm rear disc brake for reliable stopping performance. The motorcycle rides on 21-inch front and 18-inch rear wheels with Dunlop Geomax MX tires 80/100 front and 110/100 rear. Additional specifications include seat height Approx. 955 mm, wheelbase Approx. 1470 mm, ground clearance Approx. 330 mm, wet weight Approx. 110 kg, compression ratio 13.8:1, bore 77 mm, stroke 53.6 mm, and fuel tank capacity Approx. 7.8 L.