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.
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.
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.
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.
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
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
Fuel capacity: 6.4 L
Transmission: 5-speed, return
Final drive: Chain
Clutch: Wet multi-disc, manual
Type: Perimeter, aluminium
Front: 80/100-21 51M
Rear: 100/90-19 57M
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: New Uni-Trak with 19-way (low-speed), 4 turns (high-speed) Compression damping, 22-way Rebound damping and Fully adjustable Spring preload
Front: Single semi-floating Ø270 mm petal disc
Rear: Single Ø240 mm petal disc
2017 KX250F Lime Green