Abstract: To provide a lubricating device for an engine in which a generator is housed in a generator chamber formed between a crankcase and a generator cover connected to the crankcase. A block side return oil passage is in communication with a head side return oil passage provided in a cylinder head and is provided in a cylinder block in such a manner as to be in communication with the generator chamber in order to return oil from the cylinder head to the oil pan through the generator chamber. The device is intended to prevent a raise in oil temperature and an increase in friction loss by adjusting the amount of oil flowing into the generator chamber to an optimum value. A branch oil passage is in communication with an intermediate portion of a block side return oil passage and is provided in a cylinder block. The branch oil passage is formed so as to allow part of the oil flowing in the block side return oil passage to bypass the generator chamber and to flow to the oil pan.

Abstract: A starting motor is mounted to an approximately central portion of an engine body along the axis of a crankshaft. An over-running clutch is mounted to a first end portion of the crankshaft at a position where a starting clutch is sandwiched between the over-running clutch and the starting motor. A starting gear reducer having gears respectively fixed to both ends of a rotational shaft overlapping the starting clutch 39 is provided between the starting motor and the over-running clutch. A rotor of a generator is connected to the other end of the crankshaft.