Been a while since I've been into a late 8N, however, the carburetor if I remember correctly has two chambers; one is the fuel bowl, the other the air intake passageway. On earlier MS carburetors, on the intake side was provided about a 1/16" hole in the bottom for overflow drainage when the carburetor flooded. Check to see that if the hole is there and that it is open and if there is antifreeze solution in the intake pipe. For the fuel bowl to have antifreeze solution means either that someone accidently got antifreeze in your gas can or that the entire bottom of the intake side has filled with antifreeze solution and it has spilled over into the fuel bowl. The gasket between the fuel bowl and air passages is notoriously poor and if the intake air passage filled with antifreeze it is highly probable that you wound up with antifreeze in the fuel bowl. If yours doesn't have a drain hole, disconnect the intake pipe from the air cleaner at the inlet side of the carburetor to look for antifreeze solution on the intake side. Still means most likely however that the antifreeze source is a leak in the cylinder or cylinder head allowing antifreeze to drain back down the intake manifold. A blown or leaky head gasket is the most probable source and usually manifests itself as a dead miss long before you see other symptoms. Before you spend the 12 hours or so on exploratory surgery be sure you x-out other possibilities like contaminated fuel, water leak into the oil bath air cleaner (if it sits outside). Try if possible to isolate the offending cylinder with a leak-down test. Short or remove spark plug wires one cylinder at a time to find the miss that usually accompanies the ailment. Look also for antifreeze in the oil as usually it finds its way into the pan. Verify that the radiator is full. All else fails; pull the head and look.
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