| 摘要 |
PURPOSE:To facilitate assembling work and prevent thermal damage due to exhaust gas as best as possible without causing increase in the number of handling parts. CONSTITUTION:This four-cycle engine is provided with an exhaust passage 42 formed in a cylinder block 40, and a guide passage 54 which is extended from a crankcase 71 toward the outer face 42c positioned on the bottom dead center side of the wall constituting the exhaust passage 42 and guides lubricating oil dispersing in the crankcase 71 by rotation of a crankshaft 30 toward the outer face 42c. |
