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Kawasaki has released details on its 2011 KX250F and KX450F motocross racing machines. According to the company there are nearly 30 upgrades to the 2011 Kawasaki KX250F, reflecting “the rigour of testing and development happening at Kawasaki”.
Refinements to the 249cc single include higher compression, a modified top on the exclusive Bridged-Box Bottom piston, higher valve lift, longer spark plug design, and a new coil that offers a hotter and longer-lasting spark.
For 2011 the KX250F also gets Digital Fuel Injection (DFI) which automatically adjusts to suit track and climate conditions.
An optional ECU Setting Tool allows racers to select from several different ECU data maps or fine tune a custom map. The tool can also record up to six hours of data, including engine r/min, degree of throttle opening, coolant and air temperatures, ignition timing, fuel adjustments, gear position and system voltage.
Headlining the chassis changes on the KX250F is Kawasaki’s new Separate Function Fork. Instead of a conventional fork design, the SFF separates spring and damping duties (one in each leg) for improved performance, less friction, lower weight and easier adjustability.
The right leg has the spring, with a larger main spring/rod assembly than traditional forks; the left leg handles damping, with rebound and compression damping adjustable on the fork tube.
On the KX450F’s front, changes for the 2011 model year are much smaller and includes revised cam timing which results in better mid- and top-end performance as well as a reinforced cylinder sleeve and crankcase which offer improved durability.
Kawasaki has also revised the engine mount brackets to help optimize chassis flex and improve handling. The damping settings for the fork tubes and the rear shock have also been revised to provide lighter handling, improved suspension action, increased comfort and greater cushioning when landing from jumps.
No details for local pricing has yet been revealed.
Share your thoughts on the Kawa's new models here!
Refinements to the 249cc single include higher compression, a modified top on the exclusive Bridged-Box Bottom piston, higher valve lift, longer spark plug design, and a new coil that offers a hotter and longer-lasting spark.
For 2011 the KX250F also gets Digital Fuel Injection (DFI) which automatically adjusts to suit track and climate conditions.
An optional ECU Setting Tool allows racers to select from several different ECU data maps or fine tune a custom map. The tool can also record up to six hours of data, including engine r/min, degree of throttle opening, coolant and air temperatures, ignition timing, fuel adjustments, gear position and system voltage.
Headlining the chassis changes on the KX250F is Kawasaki’s new Separate Function Fork. Instead of a conventional fork design, the SFF separates spring and damping duties (one in each leg) for improved performance, less friction, lower weight and easier adjustability.
The right leg has the spring, with a larger main spring/rod assembly than traditional forks; the left leg handles damping, with rebound and compression damping adjustable on the fork tube.
On the KX450F’s front, changes for the 2011 model year are much smaller and includes revised cam timing which results in better mid- and top-end performance as well as a reinforced cylinder sleeve and crankcase which offer improved durability.
Kawasaki has also revised the engine mount brackets to help optimize chassis flex and improve handling. The damping settings for the fork tubes and the rear shock have also been revised to provide lighter handling, improved suspension action, increased comfort and greater cushioning when landing from jumps.
No details for local pricing has yet been revealed.
Share your thoughts on the Kawa's new models here!
