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Ok. So the 500 is a square engine. It is only long stroke compared to the super sport 600 with which it shares the bore dimension.
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500 Bore And Stroke 67.0mm x 66.8mm
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The CBR250R gets good economy by being a small single.
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250 Bore And Stroke 76mm x 55mm
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And the NC700 at
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670 Bore And Stroke 73mm x 80mm
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Which is undersquare and tuned for an ultra low rpm torque peak.
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