2010 Kawasaki motocross changes announced for 450 and 250 models
Posted on June 19, 2009
Filed Under Uncategorized | Leave a Comment
Kawasaki has announced proposed changes to its motocross lineup for the 450 and 250 models. Changes include several features used by its factory racers.
- A “bridged-box bottom piston” which is nine grams lighter and has more power in the high and over rev rpm ranges.
- A wedge-shaped crank web acts as a counterbalance to sooth engine vibrations. Kawasaki says it offsets 60% of the crankshaft’s reciprocating weight.
Changes to the 450 include
- Revised cam timing and ECU settings which Kawasaki says will improve mid to high rev performance while a reinforced cylinder sleeve and right side crankcase offers more durability.
- A new stainless steel exhaust pipe that is 40mm shorter than the 2009 titanium pipe.
- Updated chassis with a new lower-rigidity steering stem shaft and revised suspension tuning that promises added comfort and cushioning when landing jumps.
- The D-shaped aluminum swingarm has been revised with narrower ribs and thinner walls.
- The Uni-Trak rear suspension linkage has also been revised to provide a long rear suspension stroke and to make precise tuning easier.
The KX250F also received several updates, but it didn’t get fuel injection. The KX450F received fuel injection in 2009 but its smaller sibling will have to wait until at least next year to switch from carburetors.
A longer head pipe with a shorter mid-section. The suspension and chassis changes are similar to the KX450F, except with Showa parts.
Comments
Leave a Reply