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I don't think the 2008 Eliminator (US version) is 250 CC. Not sure about the earlier models as they were available up to 1000 cc if memory still serves me correctly.
The 2011 CBR250R is steel frame and swing arm. I just checked them with a magnet.
The rear suspension monoshock is located just behind the engine and the whole rear of the frame could be removed and modified fairly easy. While it may not be significant also consider that the CBR produces about 10-20% of the emissions of the Kawa.
The fixed headlight (doesn't move with the front forks) helps with streamlining. Ninja is probably the same.
Another factor is the cooling fan for the radiator. If you reduce airflow too much the the fan will come one (temp controlled), something that you could monitor to optimise your aerodynamics.
The CBR is optimised for torque, while the Ninja has greater power and engine speeds over 8500 RPM that is not really ideal for mileage. Also the larger single cylinder looses less heat to the cylinder head and walls.
Mine has just hit 3000 miles and the difference now compared to brand new is significant. Also much longer service intervals, like 6 k oil changes.
Disadvantages of the CBR is the speedo reads off the rear wheel, so sprocket changes can not easily be re calibrated in the speedometer and odometer.
The Kawa as well as all motorcycles will soon have to pass emission control standards that will require fuel injection almost certainly. The carbs are old tech and not very green
if that is important to you. Since you are already going to toss the fairings, you might find a naked CBR cheap without frame damage. I'll be looking for one in my area for the same purpose.
regards
Mech
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