Carburetor for two-stroke internal combustion engine

A carburetor for a two-stroke internal combustion engine comprising

• a carburetor unit,
• an air path and a fuel intake path, wherein the air path and the fuel intake path are disposed within the carburetor unit vertically parallel to one another,
• a rotary valve fitted into a valve hole formed in the carburetor unit, wherein the rotary valve is disposed with an axis of the rotary valve substantially perpendicularly to the axial direction of the fuel intake path and the air intake path,
• a fuel supply-side bore formed through the rotary valve substantially perpendicularly to the axial direction of the rotary valve, wherein the fuel supply-side bore controls the flow rate along the fuel intake path as the rotary valve is rotated,
• an air supply-side bore formed through the rotary valve substantially perpendicularly to the axial direction, wherein the air supply-side bore controls the air capacity along the air path as the rotary valve is rotated, and
• one or more an annular recesses formed in one of a part of an outer circumference of a cylindrical portion of the rotary valve or a part of an inner circumference of the valve hole, wherein the one or more annular recesses are positioned so as not to correspond to the fuel supply-side bore and the air supply-side bore.