STRATIFIED SCAVENGING TWO-STROKE INTERNAL COMBUSTION ENGINE, AIR CLEANER OF THE SAME, AND INTAKE METHOD

An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor (32) is decreased. An air cleaner (30) has a first inlet (60) that feeds air to an intake system air channel, and a second inlet (62) that feeds air to an intake system air-fuel mixture channel. A channel formation member (70) is attached to the second inlet (62). A channel length (L2) of an extension channel (72) formed by the channel formation member (70) is 110 mm or more.