Kawasaki KX250F: Fuel Injection & More

The Kawasaki KX250F has long been a dominant force in the world of motocross, boasting a history rich with racing success and rider development. For over a decade, this machine has been the steed of choice for many aspiring and professional riders, including notable names like James Stewart, Ryan Villopoto, and Adam Cianciarulo. Its legacy in the 250F class is undeniable, having secured more professional race wins than any other bike in its segment. However, as the landscape of motocross competition evolves, questions arise about whether the KX250F is keeping pace with its rivals.

The Evolution of the KX250F's Powertrain

The question on many riders' minds is whether the Kawasaki KX250F is equipped with fuel injection. The answer is a resounding yes, and it's a technology that Kawasaki has significantly refined. The current iteration of the KX250F's motor, which debuted in 2011, was actually the last in the 250F class to adopt fuel injection. However, Kawasaki didn't stop there. In 2012, they introduced a groundbreaking system: Dual Fuel Injection (DFI). This innovative setup features a primary injector nestled within the throttle body, complemented by a secondary injector positioned further upstream in the intake boot, between the air filter and the throttle body. The secondary injector kicks in at 7000 rpm and above, and remarkably, it becomes the sole fuel source at full throttle as the primary injector disengages. This technology, honed on Kawasaki's successful street bikes, truly revitalised the KX250F in 2012, bringing its performance to a new level.

Key Technological Advancements

Beyond its sophisticated fuel injection, the KX250F has consistently pushed the envelope with other rider-centric technologies. Kawasaki was a pioneer in introducing Launch Control, an ignition mode designed to optimise traction off the starting line by fine-tuning the fuel and spark advance maps. Furthermore, the KX250F remains unique in the 250 class for offering adjustable footpeg heights. This feature, combined with four handlebar positions, allows for a high degree of customisation, ensuring a comfortable and effective riding position for a wide range of riders. Customisation doesn't end there; the KX250F comes with three colour-coded couplers, enabling riders to switch between three pre-programmed EFI maps on the fly. For those seeking even deeper control, Kawasaki introduced the FI calibration kit for the 2016 model. This handheld device, available through dealers, allows for on-the-spot EFI map adjustments, akin to Yamaha's Power Tuner but with enhanced capabilities. It includes seven preset maps for various conditions and an SD card slot for map transfers, offering unparalleled tuning flexibility for a price of $700.

Performance and Handling Dynamics

While the 2016 KX250F saw only minor cosmetic changes from its 2015 predecessor, the competitive landscape it operates within has shifted. Although it may not hold the title of the absolute fastest bike in the class anymore, the KX250F's power delivery remains a strong point. Its engine is known for its user-friendly nature, offering robust performance precisely where riders need it most. A key attribute is its 'willingness to run,' meaning it revs freely, making the bike more enjoyable to ride and forgiving of rider errors, even if this doesn't always translate to higher peak horsepower figures on a dyno. In terms of peak power, the KX250F does concede ground to rivals like the Yamaha, which offers more power across the board, and the KTM, which boasts superior top-end power. However, it still holds its own against the Honda and Suzuki in certain situations.

The handling of the Kawasaki KX250F is consistently praised. It carves corners effectively, maintains reasonable stability, and offers a comfortable ride. A notable aspect of its evolution is its weight. While previously considered light, it is now the heaviest bike in the class at 229 pounds without fuel. This isn't due to the KX gaining weight, but rather because competitors have actively shed pounds. The KTM, Honda, and Yamaha all weigh in at 222 pounds, with the Husqvarna and Suzuki falling somewhere in between. It's important to contextualise this; while heavier, it doesn't necessarily detract from the overall riding experience.

Suspension and Braking Systems

Kawasaki continues to utilise the Showa SFF2 (Separate Function Fork 2) in the KX250F. This design is lauded for its simplicity in setup, with the spring housed in one fork leg and damping duties handled by the other. Adjustments are straightforward, typically involving one rebound clicker and one compression clicker on the left leg, along with a preload adjuster on the right. This contrasts with more complex air forks, such as the Showa Triple Air or KYB PSF2, which involve multiple Schrader valves and adjusters. The SFF2 fork provides a competent performance out of the box, offering a good baseline. However, a perfectly tuned air fork can achieve a more spectacular level of performance, a feat the SFF2 fork, while good, doesn't quite reach.

The braking system on the KX250F is also described as 'good, but not spectacular.' The adoption of a larger 270mm front rotor made by Braking in the previous year was a welcome improvement, addressing a long-standing need. Nevertheless, it still doesn't quite match the stopping power delivered by the potent Brembo brakes found on the KTM and Husqvarna models.

Durability and Reliability

One of the significant advantages of a model that has been in production for several years is the predictable reliability, and the KX250F is a prime example. It is generally considered a very reliable machine. However, like any performance-oriented motorcycle, certain components are subject to wear. The clutch, for instance, is often cited as the weakest link; riders may need to replace the plates frequently unless they opt for stronger clutch springs. The 7/8-inch handlebar can bend over time, the chainguide will eventually wear out, and the grips are prone to wear from rider contact. These are common maintenance considerations for any motocross bike.

Conclusion: A Proven Performer Facing Evolving Competition

In summary, the Kawasaki KX250F remains a formidable and enjoyable motorcycle, building on its established reputation for quality and performance. It has a proven track record that speaks for itself. However, the motocross market is dynamic, with newer machines constantly emerging and pushing the boundaries of technology and performance. While the KX250F is a great bike, Kawasaki cannot afford to rest on its laurels. The competition is fierce, and continuous innovation is key to maintaining its competitive edge in the highly contested 250F class.

Frequently Asked Questions

Does the 2016 Kawasaki KX250F have fuel injection?

Yes, the 2016 Kawasaki KX250F features a sophisticated Dual Fuel Injection (DFI) system.

What is the main advantage of Kawasaki's Dual Fuel Injection?

The DFI system uses both a primary injector in the throttle body and a secondary injector upstream, with the secondary injector taking over at higher RPMs and full throttle for improved performance.

Is the Kawasaki KX250F the fastest bike in its class?

While it offers strong and usable power, it is not considered the fastest in terms of peak horsepower compared to some rivals like the Yamaha or KTM in recent years.

What are the key rider customisation features on the KX250F?

Features include adjustable footpeg height, four handlebar positions, and three EFI map couplers. An optional FI calibration kit allows for further customisation.

How does the suspension on the KX250F compare to others?

It uses a simple-to-set-up Showa SFF2 fork, which performs well but is generally considered less spectacular than fully adjustable air forks.

Is the Kawasaki KX250F a reliable bike?

Yes, the KX250F is known for its reliability, though the clutch plates may require more frequent replacement under hard use.