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Orion 125cc interchangeable parts

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I picked up one of these motors and although the cases are the same dimensions as in my Honda smallbore motors, will this top and bolt on a Honda 70cc bottom end? I'm guessing the cranks are probably different and my correct?

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Chances are the top end will not bolt onto the Honda cases due to the different engine stud spacing, and the cranks would most definitely be different, the Orion cylinder is probably 69mm tall.

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