Off-road Kawasaki KX 250 F Motorcycles
If your planning a trip to the countryside, or looking for a larger machine with “get up and go”
• Lighter weight (229.9 pounds)
• New more powerful and lighter engine
• New redesigned more narrow and lighter weight frame
• Improved clutch and shift feeling
• New flatter seat and a new lower/flatter tank, for improved handling and ergonomics
This year’s KX250F is built with race-winning components to keep Kawasaki riders in that top spot at the race track. From the showroom to the racetrack, the performance of Kawasaki’s KX family of motorcycles is proof of its engineering pedigree. It truly is the bike that builds champions.
• New redesigned engine with offset cylinder layout, for more efficient power
• Lighter bridged-box bottom piston, designed from racing experience
• Downdraft-style intake layout with new injector angle designed for optimum fuel atomization
• New downstream injector with twice as many holes, finer fuel droplets and wider angle, resulting in stronger low-to-mid power and sharp response
• New and improved combustion chamber configuration
• New 43mm throttle body
Tuned to best suit race-experienced riders, the 249cc liquid-cooled, 4-stroke single’s wide power-band focuses on high-rpm performance that extends way into the over-rev. Highly acclaimed for its high output and smooth power delivery, the 2017 model KX250F has race-inspired tuning and parts like the high-performance bridged-box bottom piston and down draft-style intake routing. Mechanical friction is reduced thanks to things like an offset cylinder—with increased forward lean angle—and plateau honing, resulting in a stronger low end as well as an increase in maximum peak power. The connecting rod now features a journal bearing in lieu of a needle bearing and items like the camshaft sprockets and chain have been revised along with a newly revised exhaust camshaft, all factors resulting in more efficient power.
The KX250F dual-injector fuel injection system is a key component to its performance; introduced in 2012, it was the world’s first to be featured on a production motocross bike. Unlike a standard digital fuel injection that uses one injector downstream of the throttle valve, the KX250F system uses a second, upstream injector located close to the airbox. The downstream injector—redesigned for 2017—is used to help ensure smooth, instant response featuring a finer atomization with more holes in the injector itself. The downstream injector creates that stronger low-to-mid range power and quick throttle response, while the upstream injector is charged with providing power.
As rpm and throttle position increase, primary operation switches from the downstream injector to the upstream injector, depending on whether in a low (1st, 2nd) or high (3rd, 4th, 5th) gear, the transition is gradual or almost instantaneous. The upstream injector’s greater distance from the combustion chamber gives the fuel particles and intake air more time to mix, as well as allowing the mixture to cool before entering the combustion chamber, both of which contribute to more efficient filling, and ultimately more power. The 2017 model also features revised ECU settings, along with a new exhaust system. The exhaust header pipe is skinnier and shorter, resulting in improved performance.
• Lightweight ECU, with revised settings
• Three engine maps (standard, hard, soft) contained in the ECU
• Optional KX FI Calibration Kit (Handheld) requires no tools, laptop or battery
The lightweight ECU of the KX250F motorcycle was designed specifically to withstand the rigors of motocross racing, while still providing a wide variety of tuning. The Kawasaki KX250F provides three engine maps that come pre-loaded into the motorcycle’s ECU that are easily accessible through the DFI® coupling plug. These three color-coded couplers are designed to tune for hard, medium or soft track surfaces, and allow riders to find the perfect power delivery for a particular terrain.
Using the optional KX FI Calibration Kit (Handheld), sold separately as a Kawasaki Genuine Accessory, a rider can store and select from up to seven separate engine maps. The kit includes a portable handheld calibration tool, which enables riders to make changes to the engine maps without the need of a PC, laptop or battery, making it easy to tune at the track. It plugs in thanks to an additional harness not included in the kit.
FRAME & SUSPENSION
• New Swingarm design with improved linkage ratio
• Lighter weight and more rigid frame design
• 6mm narrower frame design
• Showa 48mm Separate Function Front Forks (SFF Type 2)
For pro riders and amateur riders alike, the KX Launch Control is a major advantage in getting out of the starting gate straight and fast. Launch Control Mode has the greatest effect within the first few seconds of releasing the clutch off the start.
The KX250F features a Launch Control system that, with the simple press of a button, allows riders to activate a separate engine map designed to assist starting in certain conditions. The Launch Control Mode map retards ignition timing, allowing tires to gain grip in low-traction situations, and allowing riders to focus on their lines. Launch Control remains active through first and second gear, until the rider shifts into third gear, and then it returns to normal engine timing.
Even for top-level riders, controlling the hard-hitting power of a KX250F motocrosser off the start requires a high degree of throttle control and clutch finesse. By optimizing this power, Launch Control Mode helps riders maximize traction, increasing the chance of getting a good start.
Contributing to the racing components found throughout the KX250F are the brakes, with 270mm petal-style disc brakes in the front. These brakes deliver strong braking force and superb control. The petal style discs contribute to both sporty looks and a high-quality appearance. Rear caliper guard protects the caliper from damage.
2017 KX250F SPECIFICATION* Engine: 4-stroke, single cylinder, DOHC, water-cooled
Bore x Stroke: 77.0 x 53.6mm
Compression: Ratio 13.7:1
Fuel System: DFI® w/43mm Keihin throttle body and dual injectors
Ignition: Digital DC-CDI
Transmission: 5-speed, return shift
Final Drive: Chain
Frame Type: Aluminum perimeter
Rake/Trail : 28.5°/5.0 in
Fuel Capacity: 1.69 gallons
Front Suspension / Wheel Travel: 48mm inverted Showa SFF telescopic fork with 40-way spring preload adjustability and 22-position compression and 20-position rebound damping adjustability/12.2 in
Rear Suspension / Wheel Travel: Uni-Trak® linkage system and Showa shock with 19-position low-speed and 4-turns high-speed compression damping, 22-position rebound damping, fully adjustable spring preload/12.2 in
Tire Size, Front: 80/100-21
Tire Size, Rear: 100/90-19
Brakes, Front: Single semi-floating 270mm Braking petal disc with dual-piston caliper
Brakes, Rear: Single 240mm Braking petal disc with single-piston caliper
Overall Length: 85.4 in.
Overall Width: 32.3 in.
Overall Height: 49.8 in.
Ground Clearance: 12.6 in.
Seat Height: 37.0 in.
Curb Weight**: 229.9 lb
Wheelbase: 58.1 in.
*Specifications subject to change. Media please visit www.kawasaki.com for most current specifications **Curb weight includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied).