KX250FX

The KX250F engine retains the elements that made it such a strong performer: finger-follower valve actuation, intake and exhaust layout optimised for efficient flow, dual injectors, and a single-shaft primary balancer—elements that together deliver strong, controllable power. Further refinements for 2027 result in increased output, more linear throttle response, and more efficient power transfer, contributing to an overall boost in race-ready performance on the track.

While retaining the previous model’s light, agile handling character, the KX250F motocrosser//KX250FX cross-country racer receives chassis updates that add to its composed behaviour. Central to these updates are revised front and rear suspension settings, which offer increased ground-holding performance, particularly on challenging surfaces. A more compact silencer, used on non-North American models, contributes to reduced weight and mass centralisation, offering chassis characteristics that allow riders to make full use of the improved power feeling.

Cross-country-specific tuning for the suspension, complemented by a 21”/18” wheel combination fitted with enduro-type tyres, and convenient standard features like a side stand make the new KX250FX even more attractive for cross-country competitors.

Power Mode selection, Kawasaki TRaction Control and Launch Control Mode are all accessible from the left handle switches at the push of a button. And with smartphone connectivity, riders can adjust engine maps right from their smartphones.

Even when a machine produces strong power, that power must be delivered in a way that riders can fully control if it is to translate into quick lap times. With this philosophy, the KX250F motocrosser pursues an engine character that is truly “fast” on the track. Revisions to the combustion chamber shape improves combustion efficiency and increases peak power, while an extended exhaust pipe and updated internal structure for the silencer contribute to stronger low-end torque, delivering increased power throughout the rpm range. Updated FI settings add linearity to improve power delivery.

Compared to a conventional clutch, the hydraulic clutch offers more direct feel and lighter lever action. Less play as the clutch heats up during heavy use results in more consistent feeling. Improved for 2027, the clutch spring load has been increased by 15%. This helps suppress clutch slip and allows the engine’s stronger output to be transferred more directly to the rear wheel, giving the rider a more forceful, forward-driving feeling.

Symmetrically aligned intake and exhaust contribute to a strong over-run and smooth low-rpm torque characteristics. The intake offers a straight route for air-fuel mix to enter the cylinder, while the centrally positioned exhaust port lines up with the intake for high airflow efficiency—both contributing to performance. The optimised downdraft intake also adds to low-end performance.

Un équilibrage primaire à arbre unique assure une transmission de puissance plus douce et diminue les vibrations, ce qui améliore le contrôle, en particulier lors des sorties de virages à basse vitesse.

Being able to restart an engine quickly during a race can mean the difference between keeping your lead or having to fight your way back through the pack. Electric start makes restarting the engine as easy as pushing a button.

The frame delivers both light, nimble handling and a composed character. Its optimised rigidity balance offers the front-end feel that helps riders when cornering, across a wide range of conditions.

A new short-type silencer is featured on the KX250F. The new unit is 50 mm shorter and 230 g lighter, contributing to mass centralisation and a lighter, more responsive handling character.

High-performance Showa Ø 49 mm inverted coil-spring fork and New Uni Trak rear suspension offer race-ready suspension performance and adjustability to let riders tune their settings to suit conditions. Revised suspension settings front and rear offer increased ground-holding performance. The updated settings provide more confident performance on challenging surfaces and make it easier to respond to track conditions that change from lap to lap. Spring rates and damping settings optimised for the cross-country scene offer increased feedback, especially when riding on challenging trails.

Complementing the KX250F’s slim ergonomics, the shrouds, side covers and rear fender feature smooth surfaces that eliminate hooking points, making it easier for the rider to slide back and forth. A choice of four handlebar positions (25 mm forward, 15 mm forward, standard and 10 mm back) and two footpeg positions (standard, 5 mm lower) allows riders to tailor their riding position to suit body size and preference. Factory-style Ø28.6 mm (1-1/8”) Renthal aluminium Fatbar helps reduce vibration and shocks transmitted to the rider.

Les poignées ODI Lock-On medium garantissent une adhérence parfaite, et leur système de fixation à vis permet un changement facile et rapide.

Left side cover can be removed without tools, facilitating access to the air filter element. The element is now secured with quick-release hooks (previously a wing bolt), which makes changing the air filter a much simpler task—something that enduro or cross-country racers will especially appreciate.

Updated front-end styling, accentuating the KX250F’s sleek, flat design. The compact front number plate features a simple, slim design with minimal surface sculpting to convey a lighter impression. Rerouting the brake hose behind the plate also contributes to a cleaner front-end appearance. The front fender is 30 mm shorter than that of the previous model, with a more steeply slanted forward section that emphasises mass centralisation and overall unity. As before, Aggressive Green colouring—the bodywork and seat are both Lime Green—further highlights Kawasaki’s distinctive racing image and functional beauty.

While the KX250F features F21”/R19” aluminium rims, the KX250FX uses a F21”/R18” combination that facilitates putting power to the ground. Dunlop AT81 enduro-type tyres complement the KX250FX-specific wheels and are well-suited to the situations encountered in cross-country riding.

Convenient side stand comes in handy when stopping away from the paddock area.

Using the Mode (M) button on the left handlebar, riders can quickly and easily switch between two engine maps (Normal, Aggressive) provided in the ECU. For the 2027 KX250F, the FI settings in Aggressive mode were revised to deliver a sharper throttle response, offering characteristics that make it easier for riders to extract the strong acceleration they are looking for.

Grâce au bouton Traction (T) situé sur le guidon gauche, les pilotes peuvent rapidement et facilement choisir entre deux niveaux de contrôle de Traction (Faible, Fort) selon les conditions et leurs préférences. Ils peuvent également désactiver le système.

Factory-style launch control system increases the chance of getting a good start by helping riders maximise traction when starting on a low-traction surface.

Using the smartphone application “RIDEOLOGY THE APP KX,” riders are able to access and adjust their bike’s engine maps. Functionality (adjusting fuel and ignition timing) is similar to that offered by the accessory KX FI Calibration Kit used with previous models. Maintenance and setup logs are also available. *RIDEOLOGY THE APP KX is not intended for use during vehicle operation. Only use RIDEOLOGY THE APP KX when the vehicle is not being operated and it is safe to do so.