“ Rode my motorcycle in the rain, And you told me not to drive, But I made it home alive, So you said that only proves that Im insane.”
Billy Joel
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The 3 most influential two-wheelers in history, are:
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Square, Oversquare and Undersquare engines

Square, Oversquare and Undersquare are terms that describe the ratio of it’s bore and stroke. Bore is the cylinder’s diameter, and Stroke is the piston’s travel from the very top, to the very bottom:

square engine has the exact bore and stroke dimensions undersquare is when the stroke length is longer than the bore oversquare […]

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