Intake ducting has about 10-percent greater volume, resulting in improved response (especially in the ultra-low rpm range). Meanwhile, the exhaust pipe is longer to suit the new engine characteristics and its revised internal construction results in a quieter muffler that clears stricter 94 dB noise regulations.
Elsewhere, the upgraded gearbox uses a longer ratchet lever to reduce the chance of mis-shift, while a lighter ratchet lever return spring ensures that shift lever weight feel remains the same.
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Developed by some of the most talented factory riders out there, including Ryan Villopoto (AMA Supercross), the new 2011 Kawasaki KX250F looks sharper and more competent than ever. (Photo: Kawasaki) |
Lighter, slimmer frame
The KX250F’s slim aluminum perimeter frame is a lightweight construction composed of forged, extruded and cast parts. The new steel engine mounting brackets are thinner and increase lateral chassis flex. The revised rigidity balance offers a number of benefits such as enhanced rear wheel traction and cornering accuracy. Meanwhile, the reduced fork offset contributes to lighter handling, enhanced cornering accuracy and a more planted feel of the front wheel.
As seen on factory racing bikes, Showa’s Separate Function front Fork (SFF) separates damping and shock absorption duties: the left fork tube houses the damping assembly and the right fork tube contains the spring. This setup makes spring preload and shock compression/rebound adjustment easier and quicker. While it may sound illogical since each tube endures different forces, Showa engineers claim that smoothness and riding precision are improved. Plus, compared with a traditional dual-spring fork, the friction generated between the single spring and fork inner tube is reduced by approximately 25 percent.
Bottom line
Developed by some of the most talented factory riders out there, including Ryan Villopoto (AMA Supercross), the new 2011 Kawasaki KX250F looks sharper and more competent than ever. You can bet it will be back on the podium thanks to a chassis that keeps getting better and better as well as a new fuel-injected engine that proves quieter and more efficient. Bravo!