News – Kawasaki KX250F and KX450F ready to pounce! – Double ration for the KX250F …

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Kawasaki KX250F and KX450F ready to pounce !

News - Kawasaki KX250F and KX450F ready to pounce! - Double ration for the KX250F ...

Electronic injection on cross-country models has become a constant … Kawasaki is therefore innovating by fitting out its KX250F with a double injector and by equipping its KX450F with a starting assistance system and three engine maps.. Presentations.

Double ration for the KX250F…

In-depth review last year (read), the KX250F continues to evolve. It even innovates, since the "two-fifty Kawa" will be equipped next year with a double injection: "a world first on a production cross machine", underline Akashi’s men !

But beware, "Unlike the double injection that equips Supersport models (where the upper injector only works part time, providing additional fuel if necessary), the two injectors of the KX250F each have a different role", they hasten to clarify.

So "the downstream injector provides a linear and immediate response, while the upstream injector takes care of the power", says Kawasaki:"as the engine speed and throttle opening increase, the latter gradually takes over from the downstream injector".

In the end, the Greens promise that "the gain in power will be perceptible by pilots of all levels but for all that, the machine retains all the flexibility of the 2011 engine".

This engine undergoes other small changes for the 2012 season: the surface of the piston is tinned and ridged to better resist wear and retain oil, the cylinder bore is nickel-plated to strengthen the adhesion of the coating of the sleeve, the crankshaft gains in strength thanks to its thicker masses and its reinforced crank pin, and the connecting rod body thickens to improve the robustness of the connecting rod itself and its head bearing.

The Japanese engineers worked at the same time on the smoothness of the gear selection via a drum with a redesigned shape to reduce the amplitude necessary for the selection forks and a reduction in the surface roughness of the axes of these forks..

Side suspensions, the rear Uni-Trak system sees the rigidity of the rod bodies decrease in order to make the work of the rear axle more flexible and limit bottoming. The harder setting of the spring and the new damping settings should also improve the performance of this KX.

At the front, the Showa SFF fork introduced on the KX250F 2011 receives a new harder main spring – and better, necessarily … – as well as new, longer additional springs, thus protecting the stopper in rebound better..

All aspects of this motocross bike seem to have been taken into account, since Kawasaki even announces that the urethane that makes up the saddle has been modified in order to retain its original shape longer. Delicate attention !

Finally, if the "factory" style graphics, the black alumite coated rims, the black fork guards, the blue alumite finish on the suspension adjusters and the blue finish of the oil tank caps and the Alternator housing do not improve the competitiveness of the little Kawasaki in any way, they give it "a look to match its performance".

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