I have rebuilt a bunch of H carburetors. The venturi CANNOT be installed upside down. It physically will NOT fit that way.
So far, no one has mentioned the fuel inlet fitting. This fitting has a very fine mesh screen attached to it. That screen IS the fuel filter. Remove the fitting and clean the screen with aerosol carb cleaner and compressed air. Also, did you make sure the float height is correct? Is the float free to move up and down, or is it twisted slightly so that it makes contact with the side of the fuel bowl?
If the float height is too low, it won't allow sufficient fuel to enter the bowl, and the engine will not run.
Simply soaking it in carb cleaner for 3 months accomplishes nothing. The carb must be totally disassembled first and even then you need to know WHERE to look for the dirt and crud.
More often than not a rebuild kit will not be needed. All you will need is a gasket set.
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