A carburetor main body assembly for an engine has a main body. The main body has a single body passage and a single throttle plate. The single body passage has a single intake port and a single discharge port. The single intake port is connected to the single discharge port. The single discharge port is connected to a plenum of the engine. The single throttle plate is disposed within the single body passage. The throttle plate is operable to regulate airflow through the single body passage. The main body further has a first section to supply fuel to the engine and a second section to supply fuel to the engine. The first section is independent in operation from the second section. The first section is a first quadrant. The second section is a second quadrant.

A carburetor main body assembly for an engine has a main body. The main body has a single body passage and a single throttle plate. The single body passage has a single intake port and a single discharge port. The single intake port is connected to the single discharge port. The single discharge port is connected to a plenum of the engine. The single throttle plate is disposed within the single body passage. The throttle plate is operable to regulate airflow through the single body passage. The main body further has a first section to supply fuel to the engine and a second section to supply fuel to the engine. The first section is independent in operation from the second section. The first section is a first quadrant. The second section is a second quadrant.

A carburetor comprises a rotation-typed control valve which opens or closes a second bleed air passage according to an opening degree of the throttle valve. The control valve includes an upper end portion of a valve stem, and in a projection plane orthogonal to an axis of an aspirating channel, a first bleed air passage is arranged on one side of the valve stem, an upstream-side passage portion starting from the control valve of the second bleed air passage is arranged on an upper side of the aspirating channel, a downstream-side passage portion starting from the control valve of the second bleed air passage is arranged on the one side of the valve stem, and a downstream end of the downstream-side passage portion is connected to a midway portion of the first bleed air passage.

A carburetor comprises a rotation-typed control valve which opens or closes a second bleed air passage according to an opening degree of the throttle valve. The control valve includes an upper end portion of a valve stem, and in a projection plane orthogonal to an axis of an aspirating channel, a first bleed air passage is arranged on one side of the valve stem, an upstream-side passage portion starting from the control valve of the second bleed air passage is arranged on an upper side of the aspirating channel, a downstream-side passage portion starting from the control valve of the second bleed air passage is arranged on the one side of the valve stem, and a downstream end of the downstream-side passage portion is connected to a midway portion of the first bleed air passage.