2012 Kawasaki KX450F and KX250F Preview
Smoother, slimmer, faster and stronger
Not only is the KX250F the winningest bike in AMA Supercross, it’s one of the best performing bikes no matter where you race it. We loved it when we tested it in 2010, then loved it even more with fuel injection and the Single Function Fork in 2011. We’re stoked to hear that Kawasaki has made changes to improve power, increase durability and tighten up handling for 2012!
For 2012 the KX250F gets even more top-end power thanks to a dual-fuel injector system, which has a second fuel injector located in the airbox to help build a wider spread of power as revs climb. Think of it as an EFI version of the power-jet, delivering an extra dose of fuel when accelerating to increase top-end power and overrev. An updated ECU has increased power to run the digital fuel-injection system, and can be calibrated with improved software and any laptop computer that runs Windows 7.
The crankshaft has been upgraded to improve reliability and balance, and the bridged-box bottom piston and cylinder walls feature a new surface treatment to improve long-term durability. The connecting rod has a thicker stem to improve strength. The transmission has a shorter stoke of the shift fork and solid shift rods to give the rider a more positive gear selection feel.
The Separate Function Fork (SFF) gets a stiffer spring rate this year, a longer rebound spring and altered valving to improve initial feel. The external preload adjuster and slippery titanium fork tube and Kashima inner treatment remain for 2012.
The Showa shock also gets a stiffer spring and a re-valve to refine damping. Monkey motion is supplied by a new suspension linkage with a thinner, less rigid tie-rod to improve traction.
New bodywork includes a one-piece shroud and number-plate design, as well as a new seat that is more resistant to wear. The KX250F is still full of quality components, such as a Renthal bars and black alumite-coated rims. A rib-less rear hub and butted spokes further reduce unsprung weight. New graphics and anodized bits make the 2012 KX250F look trick.
To keep the KX250F’s reputation as a versatile race bike, it has optional goodies like a fuel-injection calibration kit, different weight magneto rotors, oversized handlebar adaptors, aluminum or steel rear sprockets, solid brake rotors and different rate springs.