If the hose on #4 comes straight down from a nipple on the bottom then it sounds like it is connected to the overflow - this is as it should be. If the cab bowl overflows the the purpose of the hose is to route the gas back behind the engine. All 4 carbs should have hoses attached to a nipple on the bottom of the carb bowl
I'm thinking that the screw in #1 was put there to stop overflow - not good. Why not take it out and see what happens. Overflowing gas from the carb bowl is usually caused by either a sticking float or by a split in the overflow tube up inside the carb. If I"m right in my thinking and # 1 overflow had been blocked then you will need to fix the problem and also check if your engine oil was contaminsted by gas.
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Woodstock ON Canada
1980 kz750E1, 4->1, K&N pods
Post edited by: jr, at: 2006/03/26 21:34