KX 250F

Starting At

Engine :4-stroke Single
Type :Liquid-cooled
Displacement :249 cm3
Valve System :DOHC, 4 valves

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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. In fact, the new model gets around the track 1.6 seconds quicker* than its predecessor.


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 KX250 backs up its dualinjected 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.

Lighter & lighter handling

A revision of engine and chassis components results in 1.7 kg in weight savings, bringing the already light KX250F down to a trim 104.3 kg.The lighter weight and repositioned engine contribute to lighter overall handling.


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.


Engine & Transmission
Type Liquid-cooled, 4-stroke Single
Displacement 249cc
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 with dual injectors
Fuel Type / Minimum Octane Rating -
Ignition Digital DC-CDI
Starting Primary Kick
Lubrication Forced lubrication, semi-dry sump
Transmission 5 speed, return
Maximum power -
Maximum power with Ram Air -
Maximum torque -
Dimensions & Chassis
Frame Type Perimeter, aluminium
Rake / Trail 28.5° / 126mm
Tyre - Front 80/100-21 51M
Tyre - Rear 100/90-19 57M
Wheelbase 1,475 mm
Ground clearance 320 mm
Seat height 940 mm
Curb mass 104.5 kg
Fuel capacity 6.4 Litres
Overall Dimensions (L x W x H) 2,170 x 820 x 1,265mm
Brakes & Suspension
Front / Wheel Travel 48 mm inverted telescopic Separate Function front Fork (SFF) Type 2. Compression damping: 22-way. Rebound damping: 20-way. Spring preload: 40-way/310 mm
Rear / Wheel Travel Uni-Trak. Compression damping: 19-way (low-speed), 4-turns (high-speed). Rebound damping: 22-way. Spring preload: Fully adjustable/310 mm
Brake - Front Single semi-floating ø270 mm petal disc
Caliper - Front Dual-piston
Brake - Rear Single ø240 mm petal disc
Caliper - Rear Single-piston