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Fuel was mixed with castor oil, and delivered through the fixed crankshaft. Late in WW1 they even developed a carb that would work inverted, something the early Spitfires did not have in early WW2. Gnomes went through a valve the piston crown, LeRhones and most of the others had intake runners for each cylinder.
Pretty sure they controlled speed by selectively shorting the plugs out, plugs fired once per revolution but they were 4 stroke.
regards
Mech
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