I have a 12 horsepower Gale Buccaneer that has an integral tank and the carburetor seat on that motor is I would say twice the diameter of the typical OMC seat. I puzzled over that when I first saw it but I’m pretty sure it’s because that motor does not have a fuel pump since it is an integral tank and they probably wanted to ensure sufficient fuel flow as it was a 12 horsepower motor and would require a fair amount of fuel being fed by gravity.
