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I don't see how an external exhaust flapper would work on a SX-M outdrive? On my 2005 SX-M the exhaust is open to the underneath of the transom plate outside before the exhaust bellows connection. The exhaust gas only goes through the bellows when the prop creates a suction. At low speeds it...
Just to clarify to the purpose of this float valve and vent to the "inlet manifold". It is a vapor/air vent to ensure the fuel cell reservoir stays full of liquid (fuel). If air (during initial start) or gas vapor (during a hot start) should accumulate in the reservoir the float drops and...