Rotary type carburetor for stratefied scavenging engine

A rotary type carburetor for a stratified scavenging engine comprising:

• an air intake passage and an air-fuel mixture passage formed in a horizontal direction on a carburetor main body, wherein the opening shape of the opening end of at least the throttle valve side of the air-fuel mixture passage is rectangular;
• and
• a throttle valve fitted into a bottomed cylindrical throttle valve hole formed orthogonal and perpendicular to a passage of the carburetor main body, wherein the throttle valve has an air supply side valve hole formed on the air intake passage side, a fuel supply side valve hole formed on the air-fuel mixture passage side, a groove pocket formed on an opening edge on an upstream end that is on a side of an accelerating rotation direction of the fuel supply side valve hole, and an opening shape on a downstream side of an opening end on at least the throttle valve side of the air-fuel mixture passage is formed perpendicular to a side parallel to an axis of the throttle valve.