The length of the crankpin has no effect on stroke. That's like saying two teeter totters having the exact same length and having their fulcrums in the exact same place are different if one has wider seats. Nope, the kid on either end will go up just as high on both teeter totters.

Stroke is determined by the distance of the crankpin's center from the crankshaft's center. A fatter crankpin or longer crankpin will make no difference.

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