Cycle News Staff | May 25, 2016
2017 Kawasaki Motocross Bikes Revealed: The KX250F is all-new thanks to a major makeover for 2017.
2017 Kawasaki Motocross Bikes Revealed.
For 2017, Kawasaki gave its KX250F a thorough going-through, just like the KX450F got last year. Kawasaki says that the new KX250F is lighter, has a more powerful engine, improved shifting, a narrower frame, and flatter seat.
The new engine has an offset cylinder layout for “more efficient power.” It has a lighter bridged-box bottom piston, and a new downdraft-style intake layout with a new injector-angle design for “optimum fuel atomization.” A new downstream injector with twice as many holes result in what Kawasaki claims is stronger low-to-mid power and “sharper” throttle response. There is also a new 43mm throttle body and exhaust system.
According to Kawasaki, as rpm and throttle position increase, primary operation switches from the downstream injector to the upstream injector—depending on whether in a low (1st, 2nd) or high (3rd, 4th, 5th) gear—for a transition that is gradual or almost instantaneous. The upstream injector’s greater distance from the combustion chamber gives the fuel particles and intake air more time to mix, as well as allowing the mixture to cool before entering the combustion chamber, both of which contribute to more efficient intake and, ultimately, more power.
2017 Kawasaki Motocross Bikes Revealed: The 2017 KX450F, which got a major overhaul in 2016, features new triple clamps and in-mold graphics.
Its ECU also has revised settings.
In the chassis department, the KX250F gets a new swingarm with a revised linkage ratio, a lighter yet more rigid frame, which is also narrower. It retains its Showa 48mm Separate Function Fork (SF Type 2) and the rear shock features revised settings and a lighter spring.
The frame has a new front downtube and 3mm narrower main beams for an overall reduction width of 6mm, and the frame’s rigidity has been “optimized to obtain improved front-end feel.”
There is all-new bodywork, as well as a flatter seat and fuel tank, which hold slightly more gas. Kawasaki says the tank/seat junction is smoother and narrower for improved rider mobility.
You can read the original magazine story by clicking HERE.
