PURPOSE:To prevent entering or muddy water and breezing thereof by communicating a mission chamber, breezer chamber with a magneto chamber through a hose for breathing, and connecting and end of the hose to the magneto chamber without releasing outside. CONSTITUTION:In an engine case 1, a crank chamber 2 is arranged on its front part, while a mission chamber 3 is arranged on its rear part. The chambers 2, 3 are communicated with each other by means of a lower through-hole 4, and a specified amount of lubricating oil is sealed therein. A breezer chamber 5 is provided on an upper part of the mission chamber 3, while the chambers 3, 5 are communicated with each other via a small hole 6. One side of a crank shaft 7 is sealed with a sealing plate 8, while a magneto 9 is installed on its end. An upper end of the breezer chamber 5 is communicated with an upper end of a magneto chamber 11 through a hose 14. The lubricating oil is separated from gas in a space of the breezer chamber 5 and returns to the mission chamber 3, and only the gas is sent to the magneto chamber 11 through the hose 14 for breathing.
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