This Eska 7.5 is air-cooled,with an impeller.If that's not enough,it's a 2 stroke Tecumseh.Well the question is,has anyone ever tried a 4 stroke carb.on one?? The fact.carb.has a duck-bil fuel pump & bowl/float system.If the gasket were re-done to cover vaccum hole,,one would think it might work...