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New dual injector Digital Fuel Injection system
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More robust high-rpm engine output extends deep into the overrev
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Revised transmission offers improved shifting action and durability
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Thicker, stronger engine components improve reliability
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Revised Showa Separate Function Fork (SFF) offers more supple initial hit, and improved action during corner entry
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Increased spring rates on front and rear suspension enhance traction and offer a more solid feel
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249 cc, liquid-cooled, 4-stroke, 4-valve, 1-cylinder DOHC engine delivers hard-hitting power across the rpm range
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Improved decompressor spring action for easier starting
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New nickel plating on cylinder walls has a higher adhesion factor for increased durability
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New connecting rod has a thicker stem for improved reliability
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New more rigid crankshaft is re-balanced for better performance and higher durability
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Thicker crank web design features a balance factor on par with the factory racers for reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range
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Revised ACG stator and rotor inertia complements the changes made to the crankshaft
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Upgraded system adds a new “upstream” injector located closer to the airbox
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All-new second injector features different body size, but same capacity as primary injector
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Added seal between air inlet port and throttle position sensor unit on the 43 mm throttle body protects TPS sensor from fuel penetration
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Progressive throttle linkage opens more quickly after 3/8 open position
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Simple and efficient system: No battery, fuses or relays
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Sharp and precise engine response across entire rpm range
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Offers easy engine starting
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Helps prevent engine hesitation after landing from jumps and other high-impact situations
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Light and strong piston shares same design as the factory racers, with a new tin plating to optimize its interface with the new nickel plating on the cylinder wall
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Changed shape of streak finish improves lubrication and wear resistance
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Short piston pin reduces reciprocating weight
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Lightweight, highly rigid, titanium 31 mm intake and 25 mm exhaust valves reduce reciprocating weight and offer high-rpm reliability
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Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength
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Intake ports designed for peak performance at all rpm, especially in the high-rpm range
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Special casting method leaves the intake port surfaces extremely smooth for optimum intake efficiency across the rev range
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Silicon-coated head gasket provides excellent sealing
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Stainless steel construction offers extra durability
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High-volume muffler assembly keeps noise levels at 94 dB while retaining power production
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Joint between pipe and muffler offers excellent sealing, while a rubber damper collar on the rear silencer mount equals serious durability
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Thick and wide radiators are strong and offer excellent resistance to mud buildup while providing superb cooling performance
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Cylinder head water jacket routes coolant to the front of the cylinder head for even cooling
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Shorter shift fork stroke and more smooth solid shift forks (not hollow) offer improved shifting action
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Strong, beefy crankcases feature additional material around the engine mounts to help increase long-term durability
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Clutch cable holder is integrated with the crankcase for accurate feel at the clutch lever
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Scavenge oil filter screen can be accessed without splitting the crankcases, facilitating easier maintenance
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Utilizes a low-rigidity steering stem for lighter handling
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The KX250F’s slim and lightweight aluminum perimeter frame is composed of forged, extruded and cast parts
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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
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Upper engine mounts on head cover sides increase overall rigidity
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Revised race-oriented suspension features heavier spring rates and revised damping settings both front and rear
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Separate Function Fork (SFF) separates springing and damping functions for less weight, better performance, less stiction and easier adjustability
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Fork features the only external spring preload adjustability in its class
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Super-hard titanium coating on the outer surface of the inner fork tubes reduces stiction and improves suspension action while also helping prevent scratches and tube damage
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Friction-reducing Kashima Coat treatment on the inside of the outer fork tubes contributes to smoother suspension action
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Wrap-around fork tube guards provide greater protection for the inner tubes
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Altered piston rod specs improve shock setting flexibility and offer better rear wheel traction
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Features Kashima Coat on the inside of the shock reservoir for reduced friction and smoother suspension action
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Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately
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Swingarm features optimum internal bracing and flex characteristics for superb cornering performance
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Alloy swingarm uses a cast front section, tapered hydro-formed spars and forged chain adjusters
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Uni-Trak® rear suspension linkage system mounts the suspension arm below the swingarm, allowing more rear suspension stroke and precise tuning
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Linkage system receives upgraded tie-rod which has less rigidity for smoother suspension action and improved traction
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Linkage ratios for the Uni-Trak rear suspension match rear shock damping settings to achieve maximum rear wheel traction
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Bodywork components offer the rider a slim interface, making it easy for racers to feel comfortable and go fast
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Formed using a double-injection molding process, the 2-tone shrouds offer a slim design
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Side number plates also 2-toned and contribute to the slim package
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Right side panel has an added passageway to help cool the silencer
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Frame is wider at the ankles to offer better grip and narrows near the bend below the seat to allow a slim riding position
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Slim seat features upgraded polyurethane, designed for greater durability
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Seat has a slip-resistant top and side surface for good grip when seated and while standing
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50 mm wide (front-to-rear) footpegs offer superb grip and feel at the pegs
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Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable while on the fly
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Throttle grip has a 1-piece collar that provides additional stability during throttle operation
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Lightweight short-length grips feature a pattern designed to provide excellent grip
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Black alumite-coated rims, just like the factory racers
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Titanium coated inner fork tubes to minimize stiction
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Lightweight rims offer maximum strength and weight savings
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Thick and rigid front fender
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Rear brake pad material offers powerful braking performance
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Front and rear petal brake discs help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient stopping performance
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Rear caliper guard protects caliper from damage
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Ribless rear hub and butted spokes further reduce unsprung weight
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Renthal aluminum handlebar is standard equipment
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Blue ignition cover plugs and oil filler cap match the blue accents on the factory race bikes
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Factory-style graphics complement the KX250F’s highly tuned performance
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New countershaft sprocket cover improves look
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New polyurethane resin drive chain roller reduces weight
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Redesigned air boot allows room for second fuel injector
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Large resin skid plate offers great protection with minimum weight
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