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you have a leak in the internals of the carb. remove carb, fill with gas thru the vent tube and let stand on a cloth or paper towel and see if the gas is going thru while it is sitting. next change to a smaller jet. I have tried the speedway adjustable jets for multi-carb set ups and they have worked out great. either way you are getting way too much gas and as Mart says check the settings on the carb