The 2017 KTM 125 SX is powered by a 124.8 cc liquid-cooled single-cylinder 2-stroke engine with Mikuni TMX 38 carburetor, kick start, 6-speed transmission, wet multi-disc DDS clutch with Brembo hydraulics, and chain final drive delivering strong high-revving motocross performance and excellent power-to-weight ratio. The chassis features a lightweight chromium-molybdenum steel frame with aluminum rear subframe designed for agility, stability, and precise cornering. Suspension includes WP AER 48 mm air upside-down front forks providing Approx. 300 mm travel and a WP rear monoshock with linkage delivering Approx. 310 mm travel for race-ready handling and control. Braking is handled by a 260 mm front disc and 220 mm rear disc with Brembo components for powerful stopping performance. The motorcycle rides on 21-inch front and 19-inch rear wheels with motocross tires. Additional specifications include seat height Approx. 960 mm, ground clearance Approx. 375 mm, dry weight Approx. 87.5 kg, bore 54 mm, stroke 54.5 mm, and fuel tank capacity 7.5 L.