The japanese announced some early release 2011 models, and the most interesting is the strongly revised KX250F. The 250 cc machine has some significant upgrades for this year, but the Kawasaki engineers scrutinized every system and component of the race-winning 2010 KX450F, too.
Kawasaki KX250F 2011
The most important change on the 250 cc machine is the new digital injection system, which is basically the same as the one on the KX450F. The new system automatically adjusts to atmospheric conditions and is designed to provide crisp, immediate throttle response. It also can be fine tuned for engine modifications or for different power delivery. The engineers changed the compression, which increased the power. The race bike has a new chassis upgrade in the form of a Separate Function Fork which divides spring and damping functions.
Kawasaki KX 450 F 2011
There are some changes on the big brother, too. The 449 cc single-cylinder engine got a new fuel-system for more torque at lower revs. The chassis components remained mostly unchanged, but the KX450F has a new Uni-Trak suspension system for racing riders at the rear, while the front of the Kawa has a Kayaba AOS fork with separate oil and air functions. The digital fuel injection system includes the small ECU which requires no battery, thus reducing weight.
