That's the main jet needle and variable venturi piston/diaphragm assembly. You shouldn't see any raw gas there, though if the engine was running and you were looking down the air intake/carburettor throat you might see some fuel spray. The main jet adjustment and float chamber where the gas should be (and where you could see the gas, if there was a glass window on the side like some Japanese carburettors) are on the BOTTOM of the carburettor.

Happy Motoring, Mark

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DrDKW