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Getting the fuel air mix to the cylinders - There is a big carburettor on the back of the (fixed) crankcase. The mixture feeds into the crankcase, like on a small two stroke, and is distributed up inlet pipes to each cylinder.
The valves are opened by two monster cams, in the crankcase, and pushrods.
There is also a total loss lubricating system.
The part that I have never been able to fully engage with is how they got the power from the magneto to the spark plugs. I have guessed that there was some sort of slip ring, also in the crankcase.
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The Mad Landsman
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