The 2021 Yamaha YZ250F is powered by a 249 cc liquid-cooled single-cylinder 4-stroke DOHC engine with 44 mm Mikuni electronic fuel injection, electric start, 5-speed transmission, wet multi-plate clutch, and chain final drive delivering strong low-to-mid-range torque and class-leading motocross performance. The chassis features a lightweight aluminum bilateral beam frame designed for excellent cornering stability and rider feedback. Suspension includes fully adjustable 48 mm KYB Speed Sensitive System (SSS) upside-down front forks providing 310 mm travel and a fully adjustable KYB rear monoshock delivering 317 mm travel for exceptional track control and comfort. Braking is handled by a 270 mm front hydraulic wave disc and 240 mm rear hydraulic wave disc for powerful stopping performance. The motorcycle rides on 21-inch front and 19-inch rear wheels with motocross tires. Additional specifications include seat height 970 mm, ground clearance 335 mm, wet weight 106 kg, bore 77 mm, stroke 53.6 mm, and fuel tank capacity 6.2 L.