2017 KX250F

Lighter, Faster 250 Motocrosser

The KX design philosophy – to put midlevel to expert riders on the top step of the podium – has not changed since the brand was launched over 40 years ago. The KX250F has a history of winning: in the extremely competitive 4-stroke 250cc class it is the racer with the most AMA Supercross and Motocross titles. Adding to its highly acclaimed engine and chassis performance, numerous industry firsts and advanced technology, the 2017 model offers a more powerful engine, a significantly lighter chassis, and slimmer ergonomics, making the new model the fastest KX250F yet. The new model gets around the track 1.6 seconds quicker* than its predecessor. *Kawasaki test rider on a 1’55s-lap course.

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Kawasaki Technology

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Key Features of the 2017 KX250F

  • 4 position adjustable handlebar
  • Separate Function front Fork (SFF) Type 2
  • Oversized petal disc brakes
  • Factory styling - graphics and finishes
  • 2 position adjustable footpegs
  • Uni-Trak rear suspension
  • Next-level Power and Performance
  • Downdraft-style intake routing
  • 249cm³ liquid cooled, 4-stroke single with dual injectors
  • Setting adjustable motocross ECU
  • Slimmer and lighter aluminium perimeter frame
  • Lightest in class

 

The KX design philosophy - to put mid-level to expert riders in the top step of the podium - has not changed since the brand was launched over 40 years ago. The KX250F is perhaps the motocross bike to put you out the front of the pack and keep you there.

 

2017KX252AHF Righthand data 450x300

Advanced Suspension Technology

Separate Function front Fork (SFF) Type 2

The KX250F was the first mass-production motocrosser to feature Showa’s Separate Function front Fork (SFF), which separates damping and shock absorption duties:

  • Left fork tube: damping assembly
  • Right fork tube: spring

The configuration offers both smooth action and firm damping performance – a combination difficult to achieve with a conventional fork. 

  • Using large φ48 mm inner tubes contributes to greater fork rigidity, resulting in a more planted feel from the front wheel.
  • With only one spring, the friction generated between the spring(s) and fork inner tube(s) is greatly reduced (approximately 25% less), resulting in extremely smooth action throughout the fork stroke.
  • Being able to use larger damper pistons not only enables smoother action, it also makes firm damping performance possible.
  • The large diameter fork tubes enable larger damper components. 
                            Main piston diameter         30 mm
                            Sub-piston diameter          35 mm
    With the larger components, the same damping force as the 47 mm SFF Type 1 can be achieved with a lower internal pressure. With the lower pressure, the 48 mm SFF Type 2 is even better equipped to offer both increased riding comfort and firmer damping performance.
For 2017, a lighter inner-tube design fine-tunes fork rigidity. Together with revised shim stack layout, revised oil level and firmer spring rate (9.6 N/mm >> 9.8 N/mm), the busy pitching effect over braking bumps is reduced, and cornering stability is increased while sharp turn-in is maintained. High-speed stability is of course uncompromised.

Race Ready Front Suspension

A super-hard titanium coating on the outer surface of the inner fork tubes helps prevent wear abrasion.  The increased surface hardness of the dark navy blue coating also helps to prevent scratches and damage to the tubes.  Because the surface remains smooth for a longer period, sliding friction (and stiction) is reduced and action is improved, contributing to a smoother ride. (The KX250F is the only motocrosser in its class to feature this race-ready coating standard.)

Removing the damper assembly from the right fork tube frees up space for a pre-load adjuster. Having a preload adjuster simplifies the task of setting the fork preload or front height. The racer friendly SFF Type 2 also facilitates other maintainence chores like adjusting damping and changing springs.

2017KX252AHF SFF Fork 300x2272  2017KX252AHF SFF Fork Friction 300x2272

2017KX252AHF SFF Forks 400x300

 

 

2017KX252AHF Fork tops 300x227

Race Ready Rear Suspension

The rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately. A self-lubricating anodised coating on the tank cylinder helps prevent wear abrasion, and reduces friction for smoother suspension action.

Revised valve settings contribute to improved ride feel and increased rear-end feedback. Lighter shock spring (care of thinner wire diameter, fewer coils and shorter length) offers 285 g in weight savings. Lower spring rate (53 N/mm >> 52 N/mm) contributes to the reduced pitching effect over braking bumps.

Uni-Trak rear suspension system mounts the suspension arm below the swingarm, allowing a longer rear suspension stroke. The longer stroke in turn allows more precise rear suspension tuning. Extensive rider testing was conducted to determine the ideal linkage ratios and rear shock absorber damping settings to achieve maximum rear wheel traction.

2017KX252AHF Rear Shock 300x227

2017KX252AHF Front Disc 300x227

Oversize New Petal Disc

Larger oversized 270mm front disc (up from 252mm) contributes to increased braking power and control. 

The radical design front and rear petal discs offer strong braking performance, excellent competitive edge with high quality factory looks.

2017KX252AHF Piston Bottom 300x227

Bridged Box Bottom Piston Design

High-performance piston, featuring the same design used on our factory racers, contributes to strong performance at all rpm. A short skirt, reinforced external ribs and the use of a bridged-box bottom, featuring internal bracing, contributes to a light, strong piston design. Already the lightest piston in its class, revised design and strength optimisation save an additional 4 g, further reducing reciprocating weight and contributing to the engine’s increased performance. Piston pin is offset 0.25 mm, complementing the offset cylinder and reducing mechanical loss. Strength optimisation results in a lighter piston pin: weight decreases 2 g. Coating and striation on the piston outer surface ensure good wear resistance and oil retention for minimal sliding friction. A change from tin plating to a molybdenum coating reduces mechanical loss.

2017KX252AHF Couplers 300x227

Easy engine tuning: DFI Setting Data Selection (3 map choices)

Adjusting engine settings to suit conditions has never been easier than with the KX’s FI couplers. Plug-and-play style system is quick, easy and stress-free. Instead of a single engine map, the ECU features three (four, counting the Launch Control Mode map). Initial settings for the three maps are: Standard (green), Hard (conditions)(black) and Soft (conditions)(white). Using provided FI couplers, riders are able to easily switch between the three maps to suit riding conditions. Plugging in each of the 4-pin couplers activates the corresponding engine map. (Plug is conveniently located on the right side of the head pipe for easy access without having to remove any parts.) 

Each of the three maps can be reprogrammed using the optional KX FI Calibration Kit.
2017KX252AHF ECU Controller 300x227

Precision engine tuning: KX FI Calibration Kit (Accessory)

The updated KX FI Calibration Kit features the handheld KX FI Calibration Controller, which enables expert riders to adjust engine characteristics (by rewriting actual data maps) to suit their preference.  This simple tool can be used without a PC, simply by plugging into the engine’s ECU.

The KX FI Calibration Controller is handheld tool with a built in colour LCD screen.  It comes with transfer and diagnostic cables, SD memory card, user manual and a carrying case.

Ask you Authorised Kawasaki Dealer for more information on this option.

2017KX252AHF Throttle body 300x227

43 mm Throttle Body

43 mm throttle body is more compact and lightweight.

Designed specifically for motocrossers, the fuel injection system incorporates a small lightweight ECU and operates without a battery to further eliminate unnecessary weight.  And of course, fuel injection eliminates the need to adjust engine settings to suit track and climate conditions

The Holeshot Advantage: Launch Control Mode

The KX250F features a launch control system similar to that on our factory racers. With the simple press of a button, riders can activate a separate engine map designed to ensure efficient race starts in slippery conditions. The Launch Control Mode map retards ignition timing, allowing tyres to gain grip in low traction situations.

Launch Control Mode has the greatest effect within the first few seconds of releasing the clutch off the start. This is the most crucial time for the rider to get ahead of their rivals and line up the first corner.

To activate the Launch Control Mode riders depress the launch control button (for 2 seconds) located at the left handle. when activated the light next to the button will flash quickly to let the rider know it is on. Launch Control Mode works in 1st and 2nd gear.  Once the rider shifts into 3rd gear, the system is automatically disengaged, switching back to the normal engine mapping.

2017KX252AHF Launch control button on 300x227

Launch Control 450 wide

2017KX252AHF Adjustble Handlebars 300x227

Ajustable Handlebar Postion

A choice of four positions allows riders to tailor their riding position. Factory-style Renthal handlebar and pad come standard.

Upper triple clamp with two sets of handle mount slots and reversible handle mounts offers riders a choice of four handle positions to choose from: 25 mm FWD, 15 mm FWD, STD and 10 mm BK

2017KX252AHF Adjustble Footrest 300x227

Adjustable Footpeg Position

Riders can choose from two positions on the footpegs to suit their body size and personal preferences.

The adjustable brackets enable riders to lower the footpeg postion 5mm.  In the lower position, centre of gravity is lowered as is the rider's point of view, adding to both the physical and psychological stability.

2017KX252AHF Slim Interface 300x227

Slim Interface

For 2017, a slimmer new frame is one of the many components contributing to the new KX250F’s trimmer form. Weighing over 1.5 kg less than its predecessor, the new model is quicker both in the straights and through the corners. Suspension settings for the high-spec SFF Type 2 front fork and Uni-Trak rear shock were adjusted to deliver greater stability over braking bumps and through corners. A slimmer, flatter rider interface further improves the adjustable racer-friendly ergonomics, helping racers to rider even faster

2017KX252AHF Righthand data 450x3002017KX252AHF Front Rear 450x300

Factory Styling

Matching the KX250F’s lighter weight, all-new KX450F-inspired minimalist bodywork makes the bike look more compact. Its shroud, fender and number plate designs ensure it is the sharpest looking bike in the paddock.  Factory-style graphics further reflect the KX250F’s highly tuned performance, while new in-mould graphics give the design high durability. Green highlights on the suspension adjusters and engine oil cap and generator cover plugs contribute to a distinctive Kawasaki look.

 

  • Kawasaki’s first in-mould graphics used on the shrouds result in an ultra-smooth surface and ensure the racy graphics are not easily damaged.
  • Aggressive design of the new front fender adds to the racy looks and saves 50 g in weight. The rear fender’s sharp design contributes a further 70 g in weight savings.
  • Rims are coated in black alumite1–just like our factory racers.
  • Fork and rear shock adjusters have a green alumite1 finish like our U.S. factory racers.
  • Embossed Kawasaki logo on the clutch cover made to appear as the contact from your riding boots wears off the paint.
  • Green finish on the oil cap and the two plugs on the generator cover further contribute to factory looks.
  • Embossed design on the clutch cover designed to gradually appear as contact from riding boots wears off the paint.
  • Engine covers are finished in silver paint, further reinforcing the KX250F’s factory image.

1 Alumite: an anodic oxidation finishing treatment for aluminium resulting in a coloured, corrosion/scratch-resistant film coating.

2017KX252AHF Left Engine 300x227

Powerful, High-Reving, Dual Injection Engine with Factory-Style Tuning

Tuned to best suit race-experienced riders, the 249 cm3 liquid-cooled, 4-stroke Single’s wide powerband focuses on high-rpm performance and extends way into the over-rev.  Highly acclaimed for its high output and smooth power delivery, the 2017 model KX250F backs up its dual-injected power and race-inspired tuning and parts (like the high-performance bridged-box bottom piston) with downdraft-style intake routing and reduced mechanical loss (care of an offset cylinder and plateau honing, among other tweaks), resulting in a stronger lower end as well as a 1 kW increase in maximum engine output.  As part of the development goal to become the lightest motocrosser in its class, changes to the engine group result in 0.8 kg in weight savings.  Finally, a new accessory KX FI Controller enables map calibration without a PC.

2017KX252AHF 2017 Intake Engine 300x227

Fuel Injection

The use of the world’s first dual injectors for a production motocrosser is a key component of the KX250F’s highly acclaimed fuel-injected performance. Tuned for high performance, its high-revving character is complemented by superb response. For 2017, downdraft-style intake routing and reduced mechanical loss further elevate engine output.

 2017KX252AHF Dual Injectors 300x227

Dual Injectors

The downstream injector is used to ensure smooth instant response while the upstream injector is chanrged with providing power. As RPM and throttle postion increase, primary operation switches from the downstream injector to the upstream injector.

Both fuel injection are fine atomising injectors with 4 holes, dispersing spray particles with a droplet size of 120 µm from the upstream injector and 75 µm fro the downstream injector. The downstream injector's finer droplet size and wider spray angle contribute to stronger low-mid range power feeling, improved response and quicker accesleration.

Colour

2017KX252AHF Right Facing 300x227

Lime Green with factory-style graphics

bwd1/49fwd
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Engine 
Type Liquid-cooled, 4-stroke Single
Displacement 249 cm3
Bore and Stroke 77.0 x 53.6 mm
Compression ratio 13.7:1
Valve system DOHC, 4 valves
Fuel system Fuel injection: ø43 mm x 1 (Keihin) with dual injection
Ignition Digital DC-CDI
Starting Primary kick
Lubrication Forced lubrication, semi-dry sump
Drivetrain: 
Transmission 5-speed, return
Final drive Chain
Primary reduction ratio 3.350 (67/20)
1st 2.142 (30/14)
2nd 1.750 (28/16)
3rd 1.444 (26/18)
4th 1.235 (21/17)
5th 1.045 (23/22)
Final reduction ratio 3.846 (50/13)
Clutch Wet multi-disc, manual
Frame: 
Type Perimeter, aluminium
Wheel travel:
Front 310 mm
Rear 310 mm
Tyre:
Front 80/100-21 51M
Rear 100/90-19 57M
Caster (rake) 28.5°
Trail 126.0 mm
Steering angle (left/right) 42° / 42°
Suspension 
Front Ø48 mm upside-down telescopic Separate Function front Fork (SFF) Type 2 with 22-way Compression damping, 20-way Rebound damping and 40-way Spring preload
Rear Uni-Trak with 19-way (low-speed), 4 turns (high-speed) Compression damping, 22-way Rebound damping and Fully adjustable Spring preload
Brakes 
Front: Single semi-floating Ø270 mm petal disc
Caliper Dual-piston
Rear: Single Ø240 mm petal disc
Caliper Single-piston
Dimensions 
Overall length 2,170 mm
Overall width 820 mm
Overall height 1,265 mm
Wheelbase 1,475 mm
Ground clearance 320 mm
Seat height 940 mm
Curb mass 104.5 kg with full tank of fuel
Fuel capacity 6.4 L
Colours 
2017KX252AHF Right Facing 300x227    
Lime Green with factory-style graphics    

 

The specifications mentioned here apply to and have been achieved by production models under standard operating conditions. We intend only to give a fair description of the vehicle and its performance capabilities but these specifications may not apply to every machine supplied for sale. Kawasaki Heavy Industries, Ltd. reserves the right to alter specifications without prior notice. Equipment illustrated and specifications may vary to meet individual markets.

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Accessories for KX252AHF 2017 KX250F

AIR FILTER CLEANER

K61021505 More info Find a Dealer

* Quickly and easily removes filter oil, dirt and other contaminants * Advanced formula removes super tacky air filter oils by breaking down and solubilising the oil * Easily washes out with water * Works with both foam and fabric air filter elements * Will not degrade foam, paper or glued air filter seams * For best results use with Kawasaki Performance Air Filter Oil * 64 US FLOZ (1892mL)

CHAIN LUBE SYNTHETIC

K61021507 More info Find a Dealer

* Advanced race proven formula designed for both on and off-road applications * Ultimate protection for your drive system from rust, corrosion, and premature wear * Super tacky formula resists "fling off" * Safe for O-ring and non O-ring chain types * 14 OZ (395g)

CLEANER WIPE DOWN

K61021503 More info Find a Dealer

* High gloss formula specifically developed for the Powersports industry * Wipe down cleaner coats plastic, fiberglass and painted surfaces * Restores showroom shine in a few quick wipes * Makes cleaning process fast, simple and effortless * Leaves a clear coat film for extended protection against the elements * 12 US FLOZ (355mL)

DETAILER WAX AND SHINE

K61021502 More info Find a Dealer

* The All-In-One Detailer that cleanes shines and protects all painted surfaces, chrome parts, windshields and plastics * Carnauba wax formulation provides a deep show-like shine making your vehicles painted surfaces come to life * Easy spray applicator * 12 US FLOZ (355mL)

Folding MX Bike Stand and Mat

999AKITMX01 More info Find a Dealer

Folding MX Bike Stand and Mat, comes with Kawasaki branding sticker kit

KX CALIBRATION CONTROLLER KIT

999990541 More info Find a Dealer

The KX FI Calibration Controller is a handheld tool with a built in colour LCD screen. While the controller is designed to satisfy racers and expert riders, it is simple and hassle-free to use. Interacting with the ECU is accomplished simply by connecting the controller using the provided cables (no PC or battery necessary). The KX FI Calibration Controller contains seven preset settings that can be quickly and easily used to adjust the ECU to suit track conditions. The maps can be stored on a PC: data transfer between the controller and a PC can be done via SD card. (This controller requires the following two cables 26011-0315 and 26011-0933).

KX FI CALIB SOFT UPGRADE

999990307 More info Find a Dealer

THIS PART IS ONLY REQUIRED TO BE USED IN CONJUNCTION WITH PREVIOUS KIT 99999-0240 TO UPGRADE OLD KIT FOR PROGRAMING OF 2011 MODEL KX2450F AND KX450F BIKES ONWARDS. THIS KIT IS NOT REQUIRED WHEN USING NEW KIT 99999-0289 * These items are intended for closed-course competition use only * Alteration of emissions-related components can constitute violation of federal and/or state laws and design rules * Substantial fines and penalties can result if used for other than closed-course competition use * Use of unauthorized components and use of a vehicle in competition can affect a vehicle?s warranty coverage * Kawasaki Accessories used in competition are not covered by any warranty and are not returnable * Quantities may be limited and replacement parts may not be available

MOTO MINDER HOUR METER

999AMMHM More info Find a Dealer

* MM is an engine hour meter specifically designed for use in the harsh environment of motocross racing As such, it will operate reliably in a number of other applications * - Motorcycles - MM has been specifically designed for motocross racing * It is also useful for tarmac race bikes, ATVs, enduro bikes, karts etc * Note: MM will operate on the new generation "pencil coil" ignitions * - Marine - MM is fully spec'd for saltwater marine use * Applications include outboard motors, jet skis and other recreational and race craft * MM has a dual purpose input circuit * This means that the red sense wire can be cable tied along a sparkplug HT lead (Inductive Connection) OR it can be connected directly into a voltage supply (Direct Connection)

PREWASH - ON AND OFF ROAD

K61021501 More info Find a Dealer

* Unique formula breaksdown dirt, grime and oils while gently protecting paint and other delicate finishes * Safe on plastics, carbon fiber, paint, anodizing, aluminum, titanium, rubber * Biodegradable cleaning formula * Contains no harmful acids, CFC's or solvents * Will not harm seals or brake pads * Spray on, wash off, go ride * 32 US FLOZ (946mL)