The 250 SX-F was once again the World Champion in MX2 for 2014 and added a prestigious 2015 AMA Supercross 250SX Championship to its amazing trophy cabinet. The 2014 season was a great success in racing at all levels around the globe and the remainder 2015 promises to be no different. Already known for its strong performance, the new generation 250 SX-F presents itself with a newly developed, stronger engine built into an all new chassis. The combination of a powerful engine in a lightweight and agile chassis is sure to make the 250 SX-F the star of the show for the future. The new 250 SX-F, the lightest and best performing bike in its class, is the right choice for both the amateur and professional rider; a winning bike that the competition will find hard to follow.

ENGINE

• The new 250 SX-F engine design is more compact, lighter and provides higher performance throughout the entire range of power
• New engine cases redesigned to centralize the rotating mass of the crankshaft and clutch while reducing overall length
• Completely reworked Keihin Engine Management System with new 44mm throttle body featuring a lightweight direct-connect design
• New electronic Launch Control for efficient starts and multiple engine maps to control the overall power delivery
• New cylinder head combustion chamber geometry, optimized ports, new camshafts, new timing, new finger followers and new valve springs for improved power and reduced weight
• New lightweight forged bridged box-type piston by CP, new shorter connecting rod mated to a new shorter, stiffer crankshaft contribute to a light engine feel and strong power delivery
• New 5-speed transmission features wider gears with a new surface treatment on the 2nd, 3rd and 4th gears along with a special low-friction coating on the shift forks to provide precise and easy shifting
• New "No Dirt" shift lever prevents dirt from fouling the lever joint to ensure proper shifting in any condition
• New CSS (Coil Spring Steel) one-piece clutch that has been completely redesigned for improved oil supply for better cooling, durability and lighter weight
• New super compact and lightweight 1.1lb Lithium-Ion starter battery
• New WP flow optimized radiator design features a substantial improvement in engine cooling
• New exhaust header and new lightweight silencer are both designed to increase power and contribute to mass centralization

CHASSIS

• New lighter Chromoly steel frame provides 20% higher torsional rigidity with 30% less longitudinal stiffness resulting in improved handling and energy absorption
• New smaller, lighter subframe design made with new aluminum profiles
• New lighter swingarm features a revised internal structure to match the new frame characteristics
• New lighter "No Dirt" footpeg design that provides a larger surface area and features a "scraper" to reduce dirt build-up in the hinge
• New CNC machined upper triple clamp featuring a rubber damping system for the new Neken handlebar and ODI lock-on grips
• The advanced WP 4CS (Four Chamber System) Fork has been specifically designed for Motocross and features revised damping settings optimized for the new chassis
• New generation WP shock has been developed in conjunction with the new frame and swingarm architecture including a new linkage/pullrod system
• Super lightweight Galfer Wave rotors, CNC machined hubs, high-end Excel rims fitted with Dunlop GEOMAX MX32 tires are standard equipment
• New airbox and airfilter design offers maximum protection for the engine while ensuring maximum airflow and providing quick "no tools" airfilter changes
• New ergonomics and bodywork centralize mass, improve handling and rider comfort

SPECIFICATIONS

Engine Type: Single Cylinder, 4-Stroke
Displacement: 249cc
Bore/Stroke: 78.0/52.3 mm
Compression Ratio: 14.4:1
Starter/Battery: Electric Starter / 12V, 3Ah
Transmission: 5 Gears
Fuel System: Keihin EFI, 44mm Throttle Body
Lubrication: Pressure lubrication with 2 oil pumps
Primary Ratio: 24:73
Final Drive: 13:50
Cooling: Liquid Cooling
Clutch: Wet Multi-Disc CSS-Clutch, Brembo Hydraulics
Ignition: Keihin EMS
Frame: Central Double-Cradle Type 25CrMo4 Steel
Subframe: Aluminum
Handlebar: Neken, Aluminum Ø 28/22mm
Front Suspension: WP Suspension USD 4860 MXMA 4CS
Rear Suspension: WP Monoshock 5018 BAVP DCC with Linkage
Suspension Travel Front/Rear: 300 mm/11.81 in; 300 mm/11.81 in
Front/Rear Brakes: Disc Brake 260 mm/10.24 in; 220 mm/8.66 in
Front/Rear Rims: 1.60x 21, 2.15 x 19 Excel
Front/Rear Tires: 80/100-21"; 100/90-19" Dunlop MX32
Chain: 5/8 x 1/4 in
Silencer: Aluminum
Steering Head Angle: 26.1º
Triple Clamp Offset: 22 mm
Wheelbase: 1,485mm ± 10 mm / 58.5 ± 0.4 in
Ground Clearance: 370mm / 14.6 in
Seat Height: 960 mm / 37.8 in
Tank Capacity, Approx: 7.2L / 1.9 ga
Weight (without fuel), Approx: 99.9 kg / 220.2 lbs