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your main jet is the small brass piece that fell out and now is laying to the bottom left of you. it fits inside the white plastic tube from the inside, rubber gasket side first, do not install it in the face side. Take the old rubber gasket off the white piece and put the new gasket on, think of it like putting a puzzle together, just match the shapes up. It is supposed to be slightly larger to seal the float bowl

Well did ya find your main jet? It goes into the bottom of the plastic tower where the three extended lugs are that surround the tension spring. Spring keeps tension on the plastic assembly to maintain its contact with the carb metal body.