Longboy's "SUPER H" Twin Gas Engine.

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Longboy

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Super H is essentially the same design as my SENTINEL gas engine with an added cylinder. An increased bore to 1 inch, up from 7/8 inch from my previous engines yields 29CC displacement with 1 1/8 inch stroke. I use my Smith twin coil board shared between this and my GEMINI twin. With more cyl. volume than my other twins, Super H is noticeably more torque-e at idle speed! :)

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