Abstract: An oil circulator apparatus (5) includes: a crankcase (7) in which a movable portion is stored; an oil flow path (15) that is provided on the crankcase (7) and guides oil to the movable portion; an oil pump that delivers the oil to the movable portion via the oil flow path (15); a main gallery (19) that is provided in a middle of the oil flow path (15) and is formed along an upward-downward direction; an oil filter (22) that is provided in a middle of the main gallery (19) and filters the oil which flows through the main gallery (19); and an oil discharge port (33) that is provided in the main gallery (19) at a further downstream side in a flow direction of the oil than the oil filter (22) and causes the main gallery (19) to be in communication with an inside of the crankcase (7).

Abstract: In an engine, an air cleaner and a muffler are located laterally opposite to each other with an engine body therebetween, the air cleaner and the muffler are located forward of the engine body in the longitudinal direction, a fuel tank is longer laterally than longitudinally when viewed from above and is located rearward of the engine body in the longitudinal direction, and an oil filler port which is sealed by a cap is provided to the fuel tank at a position laterally deviated leftward. A level gauge, which can be visually recognized when the cap is removed and the oil filler port is viewed from above and from the front side longitudinally, is provided inside the fuel tank.

Abstract: An automatic choke device of a carburetor includes a wax attached to an engine main body, a rod configured to perform a linear motion in conjunction with expansion of the wax, a choke lever configured to rotate in conjunction with the linear motion of the rod, and a choke shaft arranged so as to be able to abut against the choke lever and connected to a choke valve of the carburetor. The choke lever includes a flat portion that engages with an engaging portion of the choke shaft, and a circular arc portion that is formed in a circular arc shape so as to be continuous from the flat portion and is brought into sliding contact with the engaging portion of the choke shaft.

Abstract: In an engine, an air cleaner and a muffler are located laterally opposite to each other with an engine body therebetween, the air cleaner and the muffler are located forward of the engine body in the longitudinal direction, a fuel tank is longer laterally than longitudinally when viewed from above and is located rearward of the engine body in the longitudinal direction, and an oil filler port which is sealed by a cap is provided to the fuel tank at a position laterally deviated leftward. A level gauge, which can be visually recognized when the cap is removed and the oil filler port is viewed from above and from the front side longitudinally, is provided inside the fuel tank.

Abstract: An automatic choke device of a carburetor includes a wax attached to an engine main body, a rod configured to perform a linear motion in conjunction with expansion of the wax, a choke lever configured to rotate in conjunction with the linear motion of the rod, and a choke shaft arranged so as to be able to abut against the choke lever and connected to a choke valve of the carburetor. The choke lever includes a flat portion that engages with an engaging portion of the choke shaft, and a circular arc portion that is formed in a circular arc shape so as to be continuous from the flat portion and is brought into sliding contact with the engaging portion of the choke shaft.

Abstract: A fuel filler cap canister for a fuel filler cap includes: a base part having an attachment section attached to the cap and a communicating hole communicating with a fuel tank and formed in the base part; and a case member assembled to the base part and having an inner volumetric space provided with a spiral rib. The spiral rib extends from an opposing face of the case member facing the base part or an opposing face of the base part facing the case member toward the base part or the case member, respectively, and forms an adsorption path connecting the communicating hole and an atmosphere communicating hole formed in either one of a vicinity of a peripheral edge or substantially a central portion of the opposing face of the case member facing the base part. The adsorption path is filled with an adsorbing device.

Abstract: A fuel supply device supplies fuel from a fuel tank to an injector by driving a diaphragm pump by use of pressure variation within a crankcase. The diaphragm pump includes: a pump casing; a diaphragm partitioning the interior of the pump casing into a negative pressure chamber and a pump chamber; and a plunger connected to the diaphragm and reciprocatively movable to and from the pump chamber. A pressure receiving area over which the plunger receives, at its end surface in a plunger advancing/retracting direction, pressure from the pump chamber is set smaller than a pressure receiving area over which the diaphragm receives pressure from the negative pressure chamber in the advancing/retracting direction.

Abstract: A fuel supply device supplies fuel from a fuel tank to an injector by driving a diaphragm pump by use of pressure variation within a crankcase. The diaphragm pump includes: a pump casing; a diaphragm partitioning the interior of the pump casing into a negative pressure chamber and a pump chamber; and a plunger connected to the diaphragm and reciprocatively movable to and from the pump chamber. A pressure receiving area over which the plunger receives, at its end surface in a plunger advancing/retracting direction, pressure from the pump chamber is set smaller than a pressure receiving area over which the diaphragm receives pressure from the negative pressure chamber in the advancing/retracting direction.