KAWASAKI KX 250F (2011) features | insurance info |



    Details & Features

    At a Glance...
    • New Digital Fuel Injection (DFI) system
    • New Showa Separate Function Fork (SFF) divides spring and damping functions; springing in the right leg and damping in left provide less friction, better performance and easier adjustability
    • Increased engine performance via higher compression and exhaust/intake changes
    • High-performance piston featuring Bridged Box-bottom design
    • Stainless steel exhaust features longer header section and larger-volume muffler
    • Revised suspension settings front and rear aimed at race-experienced riders

    Higher Performing, High-revving Engine
    • 249cc, liquid-cooled, four-stroke, four-valve, single-cylinder DOHC engine delivers hard-hitting power across the rpm range
    • Modified intake valve timing and cam profile for increased valve lift improves high-rpm power production
    • Intake valve spring tension increased to control more radical cam timing
    • Digital Fuel Injection (DFI) system allows consistent fuel delivery, quick starts and easy adjustability
    • Engine tuned to achieve the widest possible torque band to maximize traction through a greater percentage of the rev range
    • Race-experienced riders able to harness high-rpm performance that extends way into the over-rev
    • Sprocket-style chain drive roller helps reduce the effect of driveline lash and engine braking for smoother and faster corner entries
    • 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

    Digital Fuel Injection (DFI) System
    • Same basic system that’s fitted to the KX450F
    • 43mm throttle body assembly with 20 percent higher-flow injector than the KX450F’s injector
    • Intake airflow is higher than on carburetor-equipped 2010 model
    • Progressive throttle link; opens more quickly after 3/8 open position
    • Simple and efficient system: No battery, fuses or relays
    • Improves engine response across entire rpm range
    • Offers easy engine starting
    • Prevents engine hesitation after landing from jumps and other high-impact situations
    • Optional Calibration Kit allows easy tunability
    • Optional FI Indicator Light allows the DFI system to communicate diagnostic information

    Bridged Box-bottom Piston
    • Light and strong piston shares same design as the factory racers, with a revised crown for higher compression. Also features fully flush internal bracing
    • Short piston pin reduces reciprocating weight

    Lightweight and Efficient Top End
    • Lightweight, highly rigid, titanium 31mm intake and 25mm exhaust valves reduce reciprocating weight and offer high-rpm reliability
    • Ultra-light valves have extremely thin valve stems on par with those found in supersport machines; intake valves feature thick heads for increased strength
    • Intake ports designed for peak performance at all rpm, especially in the high-rpm range
    • Special coating applied to intake port cores during casting gives the intake ports extremely smooth surfaces and optimum intake efficiency across the rev range
    • Silicon-coated head gasket provides excellent sealing

    Enhanced Durability and Reliability
    • Electrofusion treatment on cylinder bore improves surface oil retention, while the molybdenum coating on the cylinder bore surface helps resist scorching, further contributing to durability
    • Wide big-end bearing features a thick copper plate on its cage and a long crank pin for increased reliability
    • Oil pump rotors offer a high degree of reliability and durability; a large feed pump rotor maximizes oil flow, while a smaller scavenge-pump rotor reduces mechanical losses

    New Stainless Steel Exhaust System
    • Stainless steel construction offers extra durability
    • Longer header pipe section for improved low and mid-range response
    • Higher-volume muffler assembly quiets emissions to 94 dB noise regulations while retaining power production
    • Joint between pipe and muffler offers excellent sealing, while a rubber damper collar on the rear silencer mount equals serious durability

    Efficient Cooling System
    • Thick and wide 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

    Transmission and Shifting Reliability
    • Third and fourth input gears have large dogs to help prevent wear
    • Revised ratchet and lever angle for more positive shifting
    • Revised internal ratios for second and fourth gear better match new engine power delivery
    • New 50-tooth rear sprocket helps capitalize on the engine’s torque delivery
    • 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

    Quick-turning Chassis
    • Utilizes a low-rigidity steering stem for lighter handling
    • The KX250F’s slim and lightweight aluminum perimeter frame is composed of forged, extruded and cast parts
    • 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
    • Upper engine mounts on head cover sides increase overall rigidity

    Race-oriented Suspension
    • Revised race-oriented suspension damping settings optimize front/rear balance
    • New Separate Function Fork (SFF) separates springing and damping functions for less weight, better performance, less friction and easier adjustability
    • Fork now allows external spring preload adjustability
    • Super-hard titanium coating on the outer surface of the inner fork tubes reduces friction and improves suspension action. The increased surface hardness also helps prevent scratches and tube damage
    • Friction-reducing Kashima Coat treatment on the inside of the outer fork tubes contributes to smoother suspension action
    • Wrap-around fork tube guards provide greater protection for the inner tubes
    • Revised shock damping settings offer increased absorption performance and greater stability on corner entry thanks to reduced rear-end kicking
    • Features Kashima Coat on the inside of the shock reservoir for reduced friction and smoother suspension action
    • Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately

    Superior Rear-wheel Traction
    • Swingarm features optimum internal bracing and flex characteristics for improved cornering performance
    • Alloy swingarm uses a cast front section, tapered hydroformed spars and forged chain adjusters
    • Uni-Trak® rear suspension system mounts the suspension arm below the swingarm, allowing more rear suspension stroke and precise tuning
    • Linkage ratios for the Uni-Trak rear suspension match rear shock damping settings to achieve maximum rear wheel traction

    Rider Interface
    • Bodywork components offer the rider a slim interface, making it easy for racers to feel comfortable and go fast
    • Formed using a double-injection molding process, the two-tone shrouds offer a slim design
    • Side number plates also two-toned and contribute to the slim package
    • Right side panel has an added passageway to help cool the silencer
    • Frame is wider at the ankles to offer better grip and narrows near the bend below the seat to allow a slim riding position
    • Slim seat features firm urethane, which keeps its original shape longer
    • Seat has a slip-resistant top and side surface for good grip when seated and while standing
    • 50mm wide (front-to-rear) footpegs offer superb grip and feel at the pegs
    • Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable while on the fly
    • Throttle grip has a one-piece collar that provides additional stability during throttle operation
    • Lightweight short-length grips feature a pattern designed to provide excellent grip

    Factory-style Components
    • Black alumite-coated rims, just like the factory racers
    • Lightweight rims offer maximum strength and weight savings
    • Thick and rigid front fender
    • Rear brake pad material offers powerful braking performance
    • Front and rear petal brake discs help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient braking performance
    • Rear caliper guard protects caliper from damage
    • Ribless rear hub and butted spokes further reduce unsprung weight
    • Renthal aluminum handlebar is standard equipment
    • Factory-style graphics complement the KX250F’s highly tuned performance

    Additional Features
    • Large front brake lever boot offers increased protection against debris
    • Newly designed and more durable chain guide utilizes a thicker wear pad for longer life
    • Large resin skid plate offers great protection with minimum weight

    Optional Accessories
    • Optional DFI Calibration Kit allows custom tuning
    • Optional FI Indicator Light allows the DFI system to communicate diagnostic information
    • Engine parts include magneto rotors with different inertias and a 12-tooth output sprocket
    • Optional chassis parts include handlebar holder for a 1 1/8-inch handlebar, 46
    • to 50-tooth aluminum and steel rear sprockets, solid petal brake rotors, different fork and shock springs and manual decompression lever and cable



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