Abstract: An outboard motor has a V-type engine in which in which a plurality of cylinders are arranged in a V-shape, a crankshaft is arranged substantially vertically, and an overhead valve (OHV)-type valve train is mounted. This outboard motor also includes an air intake system in which a carburetor is arranged above the engine and in a space of a V bank between the cylinders.

Abstract: An outboard motor has a V-type engine in which in which a plurality of cylinders are arranged in a V-shape, a crankshaft is arranged substantially vertically, and an overhead valve (OHV)-type valve train is mounted. This outboard motor also includes an air intake system in which a carburetor is arranged above the engine and in a space of a V bank between the cylinders.

Abstract: A fuel cooling apparatus of an outboard motor with a water-cooled engine having a vapor separator, a fuel injector positioned to supply a fuel from the vapor separator into the engine, a high pressure fuel pump positioned in the vapor separator to feed the fuel under pressure to the fuel injector, and a pressure regulator positioned in the vapor separator to reduce a pressure of a return fuel, the fuel cooling apparatus including a fuel cooler having fuel and cooling water passages arranged side by side in parallel, the fuel passage interposed in a high pressure return fuel hose branched off from a high pressure fuel hose connecting the high pressure fuel pump and fuel injector and connected to upstream of the pressure regulator, the cooling water passage being positioned to circulate cooling water for cooling the engine to cool the fuel in the fuel passage.

Abstract: The present invention provides a four-cycle outboard motor (1),with reduced vibration and improved control stability. The center of gravity is moved forward allowing reduced size. In outboard motor (1), a crank shaft (4) is arranged substantially vertically within an engine (3) so that the rotational force of crank shaft (4) is transmitted to a propulsion unit via a drive shaft (10). The shaft centers of crankshaft 4 and drive shaft 10 are arranged either on an axis (31) of a cylinder constituting engine 3, or on the centerline of engine (3), which extends in the fore-aft direction and passes through the shaft center of crankshaft (4), and in that the shaft center of drive shaft (10) is arranged offset toward the rear of outboard motor (1) from the shaft center of crankshaft (4).

Abstract: The present invention seeks to provide a four-cycle outboard motor that has a simple construction and a compact design. According to the present invention, the outboard motor 1 having a crankshaft 4 disposed substantially vertically within the engine 3, wherein the rotation of this crankshaft 4 is transmitted to a valve camshafts 40 via a looped member 57 disposed at the bottom of the engine 3, comprises an oil pump 64 disposed at a position other than the shaft center position of the crankshaft 4 or the camshafts 40 at the bottom of the engine 3, wherein either this oil pump 64 or a tension adjuster 60 of the looped member 57 is disposed to the inside of the looped member 57 in plan view while the other is disposed outside of the looped member 57 in plan view.

Abstract: An outboard motor is provided with a water-cooled engine having a crank shaft arranged substantially in a vertical direction and a fuel is supplied to the engine through a fuel injector after temporarily introducing the fuel to a vapor separator. A high pressure fuel pump is arranged in the vapor separator so as to feed the fuel under pressure to the fuel injector, a pressure regulator is arranged in the vapor separator so as to reduce a pressure of a return fuel, a fuel cooler having a fuel passage and a cooling water passage arranged side by side in parallel to each other is arranged on an upstream side of the pressure regulator, and cooling water for cooling the engine is introduced to the cooling water passage so as to cool the fuel in the fuel passage.

Abstract: An exhaust passage structure for an outboard motor is provided to prevent exhaust emission interference from occurring while employing a simple construction and without increasing the engine size.

Abstract: An outboard motor fuel supply device affording improved assembly and maintenance procedures. An outboard motor has an air intake manifold arranged on one side of the engine, and fuel flow path components that supply fuel from the fuel tank to the engine arranged together on one side of the air intake manifold.

Abstract: An outboard motor includes an engine which is covered by an engine cover which is formed with a cylindrical air suction port having an opening opened to an upper surface of the engine cover in a state of the outboard motor mounted to a hull, and a portion of an opening area of the opening is covered by a lid member which is formed to a rear edge portion of the opening.

Abstract: An outboard motor having an oil pan positioned on the underside of the engine, and having an exhaust passage, a water supply passage for cooling water, and a wastewater passage extending down from the engine and passing near the oil pan. The exhaust passage, the water supply passage, and the wastewater passage are molded as a single unit with the oil pan, and provide a simple, lightweight structure that does not result in an increase in the number of parts or assembly man hours necessary for construction. The oil pan is protected from exhaust heat by the water passages, and a flush port to clean the cooling system is easily accessible.

Abstract: A sealing structure is provided for an outboard motor in which an engine is disposed on an upper portion of an engine holder in a state of an outboard motor mounted to a hull, an oil pan is mounted to a lower portion of the engine holder, and the engine, the engine holder and the oil pan are covered with an engine cover unit.

Abstract: An outboard motor comprises, in an installed or mounted state, an engine holder, an engine located to an upper portion of the engine holder, a drive shaft housing located to a lower portion of the engine holder for housing a drive shaft extending downward from the engine, and an oil pan formed to the engine holder, the oil pan being provided with a wall section to which steering brackets are secured through upper mounts. A first seal member is disposed at a mating surface portion of an upper surface of the drive shaft housing and a lower surface of the oil pan and a second seal member is disposed at a mating surface of an upper surface of the oil pan and a lower surface of the engine to thereby expose the drive shaft between the first and second seal members.