KX 250 F
- Kawasaki motorcycle model
The Kawasaki KX250F motocross motorcycle model appeared in 2004 as a replacement for the 2-stroke motocross versions of the Kawasaki KX250 and Kawasaki KX125. The first versions of the motorcycle were developed jointly with Suzuki - in the first years of production, there were two absolutely identical models on the market, Kawasaki KX250F and Suzuki RM-Z250.
In 2006, the KX250F was restyled and moved away from the concept common to the RMZ250, becoming an independent model. The updated version received a new generation of frame, redesigned engine, suspension and Renthal steering wheel.
The model is redesigned again for 2009, receiving updated exterior styling as well as redesigned engine, suspension and chassis components (to reduce weight and improve handling).
In 2010, Kawasaki released a new generation of the KX250F, although visually the model was very similar to the previous generation.
2011 was marked by another restyling of the Kawasaki KX250F, which received electronic fuel injection and a new Showa Separate Function front Fork (SFF). In 2012, a second injector was added to the fuel injection system, which slightly increased maximum power.
In 2013, the model undergoes changes again, receiving a new appearance, new settings for the injection system, engine and suspension.
For 2022, Kawasaki has introduced a new generation of the KX250F. The engine and suspension settings were changed again, the size of the front brake disc increased, and the curb weight decreased by almost 2 kg. Additional electronic accessories are also offered:
KX FI Calibration Kit
DFI Couplers
Launch Control Mode
By 2022, the model is undergoing changes again, receiving a new engine, increased brake disc sizes (270 and 250 mm) and other small differences. The model also changes its name, removing the letter F - Kawasaki KX250.
In 2022, Kawasaki introduced the new generation KX250. The updated version received a new frame, a new engine, a new electric starter system and a hydraulic clutch drive.
Brief history of the model
2004 - start of production and sales. First generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250-N1.
2005 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250-N2.
2006 - restyling of the model. Second generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250T6F.
2007 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250T7F.
2008 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250T8F.
2009 - restyling of the model. Third generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250W9F.
2010 - restyling of the model. Fourth generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250XAFA, KX250XAFB.
2011 - restyling of the model. Fifth generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250YBF.
2012 - the model receives a dual fuel injection system, which includes a lower and upper injector. The lower injector is responsible for a constant, uniform response from the throttle, and the upper injector is responsible for increasing power. As the speed increases, the computer unit switches from the lower to the upper injector. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250YCF.
2013 - restyling of the model. Sixth generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250ZDF.
2014 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250ZEF.
2015 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250ZFF.
2016 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX250ZGF.
2017 - restyling of the model. Seventh generation. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX252AHF.
2018 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX252AJF.
2019 - no significant changes. Model: Kawasaki KX250F (North America, Europe, Australia, Japan). Factory designation: KX252AKF.
2020 - restyling of the model. Eighth generation. Model: Kawasaki KX250 (North America, Europe, Australia, Japan). Factory designation: KX252BLF.
2021 - restyling of the model. Ninth generation. Model: Kawasaki KX250 (North America, Europe, Australia, Japan). Factory designation: KX252CMFNN.
REVIEW – 2022 KAWASAKI KX250 – Fastest 4-Stroke in the Class
The Japanese philosophy in creating the KX crossenduro series is to provide professional athletes with the best machine for conquering podiums. For more than 40 years, the manufacturer has managed to maintain its brand in the 250 cc enduro class, despite fierce competition. And the new mid-volume KAWASAKI KX250 will come into 2022 with a strong claim to the title of the fastest crossbike of the season.
An engine pumped to the limit, an even more balanced chassis with a new fork, powerful brakes - these are the main advantages of a qualitatively new mid-volume bike, which will certainly help the rider to cover the track faster, leaving far behind competitors on motorcycles of other famous brands.
Taking an impartial look at the bike, you might think that it is still the same high-quality 250 cc bike, pleasing with high-quality performance, but lacking stars from the sky. It's worth reading the technical information about the new KAWASAKI KX250 to understand how wrong this is!
The 2022 KAWASAKI KX250 has never been like this before!
2022 KAWASAKI KX250 Engine
While tweaking the parameters of the 249 cc engine of the new motocross star, KAWASAKI engineers focused on the high rev range. It was possible to significantly increase the peak power through the use of a new head and restructuring of the intake and exhaust.
The 2022 KAWASAKI KX250 cylinder head uses rockers to drive the valves, similar to the super-performance engine of the legendary sports car KAWASAKI Ninja ZX-10RR. The solution made it possible to painlessly raise the bar for maximum speed and apply a more aggressive camshaft cam profile.
Pumped up 2022 KAWASAKI KX250 engine
This is not the end of the list of modifications to the 249 cc heart, but just the beginning. The full list of changes looks like this:
Piston diameter increased from 77.0 mm to 78.0 mm.
Reduced piston stroke from 53.6 mm to 52.2 mm.
Intake valves are lighter by 3.5%, exhaust valves by 4.3%, taking into account the increased valve diameter.
Intake diameter expanded by 1 mm and exhaust by 1.5 mm.
Moves the cylinder 3mm forward to improve performance and improve engine balance.
Changed cylinder honing technology, reducing friction while maintaining the ability to retain oil on the walls.
The piston has been changed - with an increase in diameter, the skirt has been shortened and the walls have been strengthened.
Increased compression ratio - from 13.4:1 to 14.2:1
Reduced air filter box with an intake tract shortened by 50 mm and an intake funnel with reduced aerodynamic drag.
Increasing the throttle valve diameter by 1 mm.
Reduced outlet length by 30 mm, connecting pipe with reverse taper.
New 2022 KAWASAKI KX250 Engine Piston
Such a wide range of effective engine refinements entailed increased consumption of the air-fuel mixture, so in the 2022 KAWASAKI KX250, improvements also affected the injection system. Gasoline enters the cylinder through a dual injector system tuned for increased appetite.
The rebuilt engine is capable of producing 3.3 hp. (2.4 kW) more power, which is clearly felt when spinning the single-cylinder monster above 10,000 rpm. Riders who are lucky enough to ride the new KX250 in the 2022 season will enjoy an undeniable advantage both on long straights and when cornering thanks to the improved elasticity of the engine.
Chassis of the new KAWASAKI KX250 2022
In the world of high power, no serious engine upgrade is complete without rebuilding the chassis. The KAWASAKI KX250 cross bike was no exception, for which the combination of the necessary strength and flexibility of the power frame is especially important.
The lightweight aluminum frame is a precisely calculated structure consisting of elements of different sections and manufacturing principles - cast, extruded and forged parts are used in the frame. The complex manufacturing scheme affects the final price of the KAWASAKI KX250, but provides the athlete with a sense of perfect balance and confidence when passing the most difficult sections of the treacherous off-road track.
KAWASAKI engineers chose the center of gravity of the machine, the mounting axis of the rear pendulum and the location of the sprockets so that the powerful motorcycle maintains rapid acceleration for as long as possible instead of spectacular, but ineffective slipping and jumping into the “candle”.
The power structure of the KAWASAKI KX250 has undergone a number of changes for the 2020 version. The modified motor mounting system with the transition from through bolts to studs made it possible to obtain greater structural rigidity while maintaining the necessary margin for bending and torsion.
The new 48mm front fork with larger tubes and damping pistons provides improved shock absorption early in the stroke and optimal energy capacity throughout the entire range.
Updated fork and rear monoshock for 2020 KAWASAKI KX250
New springs increase stiffness in the front fork from 9.4 N/mm to 10.0 N/mm and in the rear shock absorber from 52 N/mm to 54 N/mm to help the suspension cope with the increased load due to the increased power of the 249 cc engine .
The KAWASAKI KX250's petal brakes also get an upgrade for the 2022 version. Updates to this system include updated front caliper pads made from material borrowed from the older KAWASAKI KX450 enduro bike, an increased rear disc diameter from 240 mm to 250 mm, and a lightweight master cylinder from the KX450.
KAWASAKI KX250 rear brake disc increased by 10 mm
The list of updates for the 2022 KX250 looks more than impressive, but the bike also retains many important features from previous versions.
First of all, this is high-quality sports ergonomics, allowing the rider to quickly take the most advantageous positions for the fastest possible passage of the route with dynamically changing traffic conditions. The KAWASAKI KX250 is equipped with the proprietary ERGO-FIT system, which allows you to precisely adjust the controls to the rider's parameters.
The new bike remains faithful to the legendary bow of KAWASAKI enduro models. Bold, sharp and fast, he will proudly wear the juicy branded “lime green” color in 2020, not allowing either spectators or judges of off-road races to doubt who is in charge on the track!
2022 KAWASAKI KX250 Official Video
On the run
Buying a four-stroke motocross bike and turning it into an enduro/cross-country bike is quite simple, but will cost extra money. The Kawasaki KX250X is already equipped with almost everything you might need for off-road competition, has an excellent chassis and a smooth, tractable engine, and thanks to the comfortable suspension it suits a wide range of riding styles and techniques. For tougher conditions under a heavier rider, stiffer springs will suffice, but most riders will be fine with stock springs. Riding on a variety of terrain showed that the motorcycle is extremely versatile, and its suspension, despite its softness, provides excellent handling and excellent resistance to breakdown. Even on rocks they provide comfort, and on a comb they provide excellent grip and very good smoothing.
The engine is excellent, and the transmission is, in any case, better than that of the cross version. The softness of the engine with a black plug, compliant suspension and torquey bottoms thanks to the large chainring give a very confident ride even on loose, dry surfaces, and the 18-inch rear wheel copes quite well with stones and somewhat smoothes out bumps.
It's great to see Kawasaki expanding the KX lineup with new models aimed at specific disciplines and riding styles.
The Kawasaki KX250X is a great entry point for those looking to compete in a variety of off-road racing, and would even be suitable for dabbling in motocross (after all, given the limitations of this bike's suspension, it won't take long to replace them with motocross components). Good equipment and a reasonable price make it an extremely strong competitor in its class.
