Abstract: In a multicylinder internal combustion engine a cylindrical member is located downstream of a carburetor, with the cylindrical member disposed parallel to a vaporizing barrel of the carburetor and arranged downstream of the vaporizing barrel. A deflector plate for changing the stream of a fuel-air mixture is provided at a downstream position of the cylindrical member. Further, a cylindrical member with a deflector plate is disposed in the downstream of the primary vaporizing barrel of a duplex carburetor, and a cylindrical member with a slant port is disposed downstream of the secondary vaporizing barrel.

Abstract: The fuel-air mixture distribution in a multi-cylinder engine is provided by a hollow cylinder disposed immediately downstream of and in coaxial relation with a carburetor barrel and a deflector is attached to the dischage or downstream end or opening of the hollow cylinder so that the fuel-air mixture flow may be deflected. The deflector is inclined downwardly toward the cylinders. In another embodiment, a hollow cylinder having a deflector attached at its discharge end, is also attached to the discharge opening of the primary carburetor barrel. A slanting opening is formed through the side wall of the hollow cylinder.