2014 Kawasaki KX250F

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Kawasaki revealed the 2014 model year of its X250F off road champion. The motorcycle comes with a series of important upgrades which help it solidify its leader position.

Among the technologies offered for the 2014 KX250F’s you’ll find a new Launch Control system, a plug-and-play adjustable ECU, Separate Function Fork (SFF), new motor mounts, revised suspension tuning and an upgraded transmission.

The motorcycle is built around a 249 cc, liquid-cooled, four-stroke single engine with DOHC and four-valve cylinder head. The engine is kept in check by a five-speed transmission with wet multi-disc manual clutch.

The ride quality is assured by a Showa rear shock with 9 position low-speed and stepless high-speed compression damping, 22 position rebound damping and fully adjustable spring preload. The rear shock is paired with a front 48mm inverted Showa SFF telescopic fork with 40-way spring preload adjustability and 22 position compression and 20 position rebound damping adjustability.

Hit the jump for more information on the Kawasaki X250F.

Upgraded and Ready to Fight for Championships

Kawasaki KX250F

Take a look at the record books and you’ll see that no other 250cc motocross bike in the modern four-stroke era has earned more championship titles in AMA Supercross and Motocross than the Kawasaki KX™250F. The 2014 KX250F’s championship-winning technology includes a new Launch Control system, a plug-and-play adjustable ECU, Separate Function Fork (SFF), new motor mounts, revised suspension tuning and an upgraded transmission. Make no mistake, the KX250F is still the dominant player in the 250cc ranks. Ride anything else, and you’ll just be playing catch-up.

The new launch control system is the first of its kind on a 250. The system works by retarding the ignition timing in first and second gears, to tailor the amount of torque delivered to the rear tire. Launch Control Mode is easily activated by pushing a button on the left handlebar, while stopped in neutral, first or second gear. Launch Control has maximum effect within the first few seconds of releasing the clutch. Shifting into third gear automatically deactivates Launch Control mode and returns ignition timing to a normal map. This high-tech system is particularly effective when chasing the holeshot from concrete starting pads and other slippery surfaces

Along with all that advanced technology and race-proven performance, the KX250F also offers more adjustability than its competition, allowing the rider to fine-tune the motor and suspension capabilities to meet the sport’s rigorous demands like no other bike in its class. Right off the production line, the KX250F gives a factory advantage to the privateer.

The KX250F frame features narrow main spars for excellent ergonomics that offer superior freedom of movement in the saddle. Further enhancing this feeling, the radiator shrouds are small and slim where they contact the rider’s legs. New high-tensile steel front engine mount plates are 29% thinner that last year’s steel plates. The new front mount plates provide a revised chassis rigidity balance that enhances front-end feel and traction. A curved left rear engine hanger bracket helps facilitate light handling and is tuned to boost rear wheel traction. The KX250F’s grips feature a low-density compound that enhances rider comfort while the grips’ position allows for compact ergonomics. The side covers are also as small as possible and form a smooth line with the airbox for easy rider movement. Since a motocross racer moves around so much, the design of the seat/tank interface provides freedom of movement and facilitates forward weight placement for better cornering.

The KX250F’s Digital Fuel Injection (DFI®) system features dual injectors that pack a one-two punch, delivering a second dose of fuel on acceleration to maximize the high-rpm power and overrev capabilities of the KX250F. The system’s second injector is located upstream of the throttle body and helps build a wider and more potent spread of power as rpm climbs. The two fine-mist atomizing injectors that feed the 250cc four-stroke powerplant have different body sizes but deliver the same total capacity per cycle.

The DFI system comes with three pre-programmed ignition maps which are easily selectable without the use of a laptop computer or any other electronic devices. Maps can quickly be changed between three settings – standard, hard (terrain) and soft (terrain) – by swapping the DFI wire coupler cap clipped to the side of the steering head. No additional accessories are needed to alternate between pre-preprogrammed maps – simply install the appropriate coupler cap to select your desired ignition mode and start winning. The ECU is also fully re-programmable and custom maps can be created by using the accessory KX FI Calibration Kit, the same tool used by Kawasaki factory and privateer teams in AMA and FIM racing.

The KX250F features intake ports with a straight intake tract for direct air flow from the airbox to the combustion chamber. This downdraft configuration contributes to strong top-end performance.

Performance is also enhanced via the 250F’s exhaust system, which uses a short header with a resonator chamber to help enhance low-end power and reduce noise. A KX450F-style muffler is short but features a large cross section to help centralize mass while meeting sound requirements.

Of course, the KX250F’s ECU settings complement its robust engine character. And the piston profile features a soft arc at the point of greatest pressure to enhance reliability. The bridged box-bottom piston and cylinder walls both feature special surface treatments to minimize wear and enhance long-term durability. Plus, strong intake valve seat material increases durability.

The KX250F was the first production motocross bike to feature Showa’s SFF fork, which separates damping and springing duties into the individual fork legs, and the SFF has proven to be so successful for riders at all skill levels that some of the competition is following suit. The KX250F’s beefy 48mm fork contributes to a more planted feel from the front wheel, thanks to large inner fork tubes with the 30mm main and 35mm sub-pistons that have been re-tuned for 2014 to enhance damping performance through the initial and mid-stroke. These components combine to offer firm damping response without sacrificing rider comfort.

A super-hard titanium coating on the outer surface of the inner fork tubes reduces sliding friction and initial stiction to improve overall fork action and contribute to a smoother ride. The extreme surface hardness of this dark blue coating also helps to prevent scratches and damage to the tubes. The KX250F is the only motocross bike in its class to come standard with this race-ready coating.

The SFF also features an inverted compression rod that locates the cylinder at the top of the fork and the rod at the bottom. This configuration increases the volume of oil at the bottom of the fork for a more progressive increase in damping force, enabling bottoming resistance to be increased without sacrificing ride quality. The joint rod arrangement aids rigidity, especially in the right fork tube, which contains the spring, resulting in even flex characteristics between the left and right tubes. The closely matched rigidity promotes better handling stability under hard braking and landing from jumps.

The Showa-built shock perfectly complements the SFF forks and has revised settings for 2014 to help capatalize on this year’s updated chassis. The shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately. The rear shock also features the Kashima Coating on its cylinder wall, to help reduce friction and smooth the suspension action. These features improve rear wheel traction and allow the KX250F to put the power down more effectively, making it easier than ever to grab the holeshot.

Any machine built to go this fast needs to be able to stop just as quickly and the braking systems on the KX250F are excellent. The pushrod-type front brake master cylinder and high-friction brake pads provide strong brake force and enhanced control, especially for the initial bite and initial mid-stroke characteristics.

The 2014 KX250F’s white rear fender, silver engine covers and black muffler end cap maintain the factory racer resemblance. And quality race-proven components such as a Renthal aluminum handlebar and black anodized aluminum wheels that are both lightweight and incredibly strong are part of the overall package.

The factory team feel of the KX250F is augmented by the lightweight magnesium clutch, generator and cylinder head covers. Plus, the embossed design on the clutch cover is designed to gradually appear as contact from riding boots wears off the painted surface. A sleek, ribless rear hub and butted spokes further reduce unsprung weight. The blue finish on the oil filler, flywheel nut and timing inspection caps contributes to factory looks and sophistication of this class-winning machine, which is bound to top plenty of podiums in the coming year.

Optional parts available through Kawasaki dealers include lighter/heavier flywheels, front and rear sprockets, solid brake discs, handlebar holder for 1 1/8” handlebar, and stiffer or softer fork and shock springs.

Racers who ride their KX250F at designated events are eligible to receive support from Team Green™, Kawasaki’s amateur racing support program. For over 30 years, Team Green has been providing regional support vehicles and highly trained technicians at more than 100 yearly events throughout the United States, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.

Authentic Kawasaki Accessories are available through Kawasaki dealers.

At a glance…

Kawasaki KX250F
  • Launch Control is a first for the 250 class and increases ability to get good starts, by maximizing available traction
  • Showa Separate Function Fork (SFF) provides progressive damping force and features 48mm inner fork tubes for rigidity
  • Dual injector Digital Fuel Injection (DFI®) system
  • High-rpm engine output extends deep into the overrev
  • High-tensile steel front engine mount plates are 29% thinner than last year’s steel plates and offer a better mix of chassis rigidity, improved feedback and superior front-end grip
  • Transmission gears feature four dogs instead of three, for enhanced shift smoothness
  • Shift-fork grooves are more-direct to enhance feel at the shift lever
  • Counter-shaft and sprocket retainer design now uses a nut and washer instead of a clip, for a more positive sprocket –to– countershaft interface and simplified sprocket swaps
  • Upgraded crankcase oil jet delivers an optimized stream of oil to the underside of the piston, for enhanced cooling
  • Revised throttle body tuning improves airflow from a closed-throttle, for a smoother idle and enhanced low-end response
  • Revised piston tuning in the left fork leg enhances damping performance through the initial and mid-stroke
  • Revised rear shock settings provide a more comfortable “baseline” for a wide range of riders
  • Grips feature shorter barrels and are made from a softer material to enhance rider comfort

High-Revving, High Performance Engine

  • 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
  • Upgraded crankcase oil jet delivers an optimized stream of oil to the underside of the piston, for enhanced cooling
  • 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 Factory-Style Launch Control System
  • Launch Control is a first for the 250 class and increases ability to get good starts, by maximizing available traction
  • Launch Control is activated by pushing a button on the left handlebar while stopped, in neutral, first or second gear
  • Retards ignition timing in first and second gears, giving the greatest effect within the first few seconds of releasing the clutch
  • Shifting into third gear automatically deactivates Launch Control Mode and returns the ignition to normal mapping
  • Particularly effective when chasing the holeshot from concrete starting pads and other slippery surfaces

Digital Fuel Injection (DFI) System

  • Intake tract designed to provide optimal 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 for sharp and precise throttle response across entire rpm range
  • Simple and efficient system: No battery, fuses or relays
  • Offers easy engine starting
  • Helps prevent engine hesitation after landing from jumps and other high-impact situations

Bridged Box-Bottom Piston

  • Piston profile helps increase reliability compared to non-box-bottom design
  • 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

Lightweight and Efficient Top End

  • 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 Stainless Steel Exhaust System
  • Head pipe resonator chamber helps boost low-rpm torque
  • High-volume muffler assembly features a large cross section to keep noise levels at 94 dB while retaining power production
  • Durable stainless steel construction

Efficient Cooling System

  • 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

Transmission and Shifting

  • Transmission gears feature four dogs instead of three, for enhanced shift smoothness
  • Shift-fork grooves are more-direct to enhance feel at the shift lever
  • 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

  • The KX250F’s slim and lightweight aluminum perimeter frame helps provide excellent 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

Separate Function Fork

  • 48mm Separate Function Fork (SFF) delivers firm damping response and increased ride comfort
  • SFF design separates springing and damping functions for less weight, better performance, less stiction and easier adjustability compared to traditional forks
  • Revised piston tuning in the left fork leg enhances damping performance through the initial and mid-stroke
  • 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
  • Friction-reducing Kashima Coat treatment on the inside of the outer fork tubes contributes to smoother suspension action
  • Wrap-around fork tube guards provide excellent protection for the inner tubes

Uni-Trak® rear suspension

  • Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately
  • Features Kashima Coat on the inside cylinder wall for reduced friction and smoother suspension action
  • Revised rear shock settings provide a more comfortable “baseline” for a wide range of riders
  • Swingarm features tapered hydroformed spars and forged chain adjusters
  • Uni-Trak® rear suspension linkage 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 shrouds offer a slim design
  • Right side panel passageways help cool the silencer
  • Flat design of the seat and tank allow freedom of movement
  • 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 polyurethane designed to be durable
  • 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
  • Grips feature shorter barrels and are made from a softer material to enhance rider comfort

Factory-style Components

  • Pushrod-type front brake master cylinder and brake pad material provide strong brake force and enhanced feel
  • Rear brake pad material offers powerful braking performance
  • Lightweight black anodized rims are durable and look just like the factory racers
  • Titanium-coated inner fork tubes minimize stiction and look great
  • Front and rear petal brake discs help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient stopping performance
  • Rear caliper guard protects caliper from damage
  • Ribless rear hub and butted spokes reduce unsprung weight
  • Renthal aluminum handlebar is standard equipment
  • Blue ignition cover plugs and oil filler cap match the blue accents on the factory race bikes
  • Factory-style graphics complement the KX250F’s highly tuned performance

Additional Features

  • Radiator shrouds and side panels provider a slim rider interface and a nimble feel
  • Embossed design on clutch cover
  • High-density chain pad on top of the swingarm is more resistant to wear
  • 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
  • Optional 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

Specifications

Kawasaki KX250F
Price$7599
EngineLiquid-cooled, four-stroke single with DOHC and four-valve cylinder head
Displacement249cc
Bore x stroke77.0 x 53.6mm
Fuel injectionDFI® with 43mm Keihin throttle body and dual injectors
Compression ratio13.8:1
IgnitionDigital CDI
TransmissionFive-speed with wet multi-disc manual clutch
Final driveChain
FrameAluminum perimeter
Rake / trail28.7 degrees / 5.0 in.
Front suspension / wheel travel48mm inverted Showa SFF telescopic fork with 40-way spring preload adjustability and 22 position compression and 20 position rebound damping adjustability/ 12.4 in.
Rear suspension / wheel travelUni-Trak® linkage system and Showa shock with 9 position low-speed and stepless high-speed compression damping, 22 position rebound damping and fully adjustable spring preload / 12.2 in.
Front tire size80/100-21
Rear tire size100/90-19
Front brakeSingle semi-floating 250mm petal disc with dual piston caliper
Rear brakeSingle 240mm petal disc with single-piston caliper
Overall length85.4 in.
Overall width32.3 in.
Overall height50.0 in.
Wheelbase58.1 in.
Ground clearance13.0 in.
Seat height37.2 in.
Curb weight233.6 lbs.
Fuel capacity1.61 gal.
ColorLime Green

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