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For almost a decade, no other bike has spent more time on AMA Supercross and Motocross podiums than the Kawasaki KX™250F. The race-proven technology of the quarter-liter motocross leader returns for 2013, with an all-new plug-and-play adjustable ECU, narrower new frame, upgraded Separate Function Fork (SFF) fork and slimmer ergonomics, so the KX250F is poised to continue its class dominance in 2013.
• Upgraded Showa Separate Function Fork (SFF) provides more progressive damping force and features larger-diameter 48mm inner fork tubes for improved rigidity and less stiction
• Dual injector Digital Fuel Injection system
• More robust high-rpm engine output extends deep into the overrev
• Stronger engine components improve reliability
• 249cc, liquid-cooled, four-stroke, four-valve, single-cylinder DOHC engine delivers hard-hitting power across the rpm range
• Nickel plating on the cylinder wall has a high adhesion factor for optimum durability
• Thick-stem connecting rod resists flex and enhances durability
• Thick crank web design features a balance factor on par with the factory racers to help minimize engine vibration, provide smooth power delivery and maximize performance in the mid-high rpm range
• Revised intake tract provides a straighter shot into the combustion chamber for more direct airflow from the airbox into the combustion chamber
• Seal between air inlet port and throttle position sensor unit on the 43mm throttle body protects TPS sensor from fuel penetration
• Progressive throttle linkage opens more quickly after 3/8 open position
• Simple and efficient system: No battery, fuses or relays
• Sharp and precise engine response across entire rpm range
• Offers easy engine starting
• Helps prevent engine hesitation after landing from jumps and other high-impact situations
• Revised piston profile helps increase reliability
• Light and strong piston shares same design as the factory racers, and a tin plating to optimize its interface with the nickel plating on the cylinder wall
• Special finish improves surface lubrication and wear resistance
• Short piston pin reduces reciprocating weight
• Stronger intake valve seat material offers increased durability
• Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength
• Special casting method leaves the intake port surfaces extremely smooth for optimum intake efficiency across the rev range
• Silicon-coated head gasket provides excellent sealing
• New 30mm shorter head pipe improves performance with a resonator chamber to help boost low-rpm torque
• New high-volume muffler assembly is 30mm shorter with a larger cross section keeps noise levels at 94 dB while retaining power production
• Durable stainless steel construction
• Thick radiators are strong and offer excellent resistance to mud buildup while providing superb cooling performance
• Cylinder head water jacket routes coolant to the front of the cylinder head for even cooling
• Strong, beefy crankcases feature additional material around the engine mounts to help increase long-term durability
• Clutch cable holder is integrated with the crankcase for accurate feel at the clutch lever
• Scavenge oil filter screen can be accessed without splitting the crankcases, facilitating easier maintenance
• The KX250F’s slim and lightweight aluminum perimeter frame is 4mm narrower for improved ergonomics and handling
• Center of gravity and key dimensions such as swingarm pivot, output sprocket and rear axle locations designed to increase forward drive with minimal rear-end squat