| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent oil in a crank chamber from being entering into a breather chamber despite of a simple structure. SOLUTION: A breather chamber 3 is formed in a flywheel side in a crankcase part, of a cylinder body 1 of an outboard motor 100, a first communication path having a first check valve 31 which feeds the fluid from the crank chamber to the breather chamber 3 and a second communication path having a second check valve 33 which feeds the fluid from the breather chamber 3 to the crank chamber are provided between the breather chamber 3 and the crank chamber, the first check valve 31 is positioned in a place higher than the second check valve 33 in a tilt-up state of the outboard motor, and a return hose 71 for feeding the inside blowby gas to a carburetor 7 is connected to the breather chamber 3. |
