Abstract: In an outboard motor, an exhaust passage is formed to a member constituting an engine such as cylinder block and a water jacket for cooling the exhaust passage is formed adjacent to the exhaust passage between the exhaust passage and an outer wall of the engine constituting member. The outboard motor is further provided with an anode device which comprises an anode mounting port formed to the cylinder block as the engine constituting member so as to penetrate the outer wall thereof and opened to the water jacket, an anode holder detachably mounted to the anode mounting port so as to close the anode mounting port, and an anode mounted to a portion of the anode holder on the side of the anode mounting port.

Abstract: An alarm device of an outboard motor arranged in operative association with an engine thereof to which a sensor device including a plurality of sensors is mounted and operated by a control power source, comprises a central control device into which an operation condition of the engine is inputted, a sensor trouble judging device connected to the central control device and the sensor device for judging a state of trouble of the sensor device, an alarm control device, a sound alarm device controlled by the alarm control device, and an alarm judging device for judging a type of an alarm, which is connected to the alarm control device so as to operate the alarm control device to operate the sound alarm device in response to an information from the sensor trouble judging device.

Abstract: An outboard motor includes an engine unit in which a crank shaft in a manner that the upper end, in a state of the outboard motor to a hull, projects outside the engine unit and a rotational member such as flywheel magneto device is covered by an engine cover, and the engine unit is covered by an outboard motor cover to which an atmospheric air intake port is formed. The engine cover is composed of inner and outer wall sections between which a closed inner space is defined, the engine cover is connected to a silencer so that the closed inner space of the engine cover is communicated with an inner space of the silencer so as to define an air passage, and an intake port is formed to the air passage to be communicated with the air passage. The atmospheric air introduced through the intake port flows the air passage of the structure mentioned above towards a throttle body with reduced intake noise.

Abstract: An outboard motor is provided with a cleaning apparatus for cleaning a cooling water passage, in which the cooling water passage is formed and an engine is covered by an engine cover, the cleaning apparatus including a connection device to which one end of a cleaning water tube, which is connected at another end thereof to the cooling water passage of the engine, is connected and a cleaning water hose is connectable to the connection device from an external side thereof. The connection device comprises a grommet mounted to the engine cover and a connector assembly mounted to the grommet. The connector assembly has a double-tube structure having an inside connecting portion and an outside connecting portion, the inside connecting portion having a union structure to which a city hose or garden hose is connected and the outside connecting portion having an outer peripheral portion to which a screw portion is formed.

Abstract: A fuel supply apparatus of an outboard motor for supplyng an air to an engine of the outboard motor comprises a vapor separator for removing bubbles in the a fuel, a float-type bubble discharge valve which is provided for the vapor separator and adapted to be closed when a fuel level in a fuel tank rises, and a negative-pressure-opening type valve connected to a downstream side of the bubble discharge valve so as to be opened upon reception of an intake negative pressure of then engine. A valve opening pressure of the negative-pressure-opening type valve is set to a value lower than a pressure of a squeeze pump, connected to a fuel tank, required for pumping a fuel therefrom.

Abstract: An outboard motor includes an engine holder, an engine disposed above the engine holder and the engine includes a cylinder block provided with a plurality of cylinders, a cylinder head disposed behind the cylinder block and a crankcase, a cam chain case through which said engine is mounted on the engine holder, and an exhaust apparatus operatively connected to the cylinder head. The exhaust apparatus includes an exhaust passage formed to the cam chain case, an exhaust manifold connected to the cylinder head, a water jacket formed to the exhaust manifold and another water jacket formed to the exhaust passage. The exhaust passage is formed at a portion near a central portion of the engine having most wide width in association with a lower end portion of the exhaust manifold.

Abstract: An outboard motor to be mounted to a hull comprises an engine holder connected to the hull, an engine mounted on the engine holder in a perpendicular fashion in which a crank shaft of the engine extends vertically, an oil pan mounted to a lower portion of the engine holder, and an oil pump for supplying an oil stored in the oil pan to the engine, in which the engine including a crank case, a cylinder block and a cylinder head, which are all secured to the engine holder by fastening bolts for improving the rigidity of a mounted engine and that of an assembled outboard motor and simplifying the structure thereof.

Abstract: An outboard motor generally comprises an engine holder to be mounted to a hull, an engine disposed in an upper portion of the engine holder in a mounted state thereof, an oil pan disposed in a lower portion of the engine holder, and a drive-shaft housing disposed below the oil pan and adapted to house a drive shaft of the engine, in which an exhaust gas from the engine is guided to the drive-shaft housing through an exhaust gas passage and the exhaust gas in the drive-shaft housing is discharged outward through an exhaust release passage connected to the drive-shaft housing at a time of low-speed revolution of the engine such as idling operation.

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 is equipped with an engine, an engine holder, an oil pan disposed below the engine in a state of the outboard motor being mounted to a hull, a water pump disposed below the oil pan, and a cooling water passage structure. The cooling water passage structure includes a vertical cooling water passage vertically passing through inside the oil pan and communicated with the side of the engine, a lateral cooling water passage extending in a lateral direction along a bottom surface of the oil pan, a cooling water supply pipe extending upward from the water pump and connected to a side of the engine, and a water pressure relief valve provided for the lateral cooling water passage for controlling a pressure increasing of the cooling water. The lateral cooling water passage has one end communicated with a lower end of the vertical cooling water passage and has another one end to which an upper end of the cooling water supply pipe is connected.

Abstract: An outboard motor includes an engine holder, an engine disposed above the engine holder in an installed state of the outboard motor, a flywheel magnet device disposed above the engine, an oil filter disposed on a side portion of the engine, an electric equipment box, an air suction device, an exhaust device and a fuel supply device, these electric equipment box, suction device, exhaust device and fuel supply device being arranged around the engine, and an engine cover covering the engine. The air suction device is composed of a throttle body, a surge tank and an intake manifold including a plurality of branch members extending from the surge tank, the intake manifold is disposed vertically, in the installed state, on one side of the engine so that the intake manifold is located between the flywheel magnet device and the oil filter as viewed from a side portion thereof and the intake manifold has at least a portion superposed on the flywheel magnet device and the oil filter as viewed in a plan view.

Abstract: A motorcycle is provided with a cowling brace having a sub-frame structure for attaching a cowling and a cowling peripheral part to a front head portion of a body frame of a motorcycle. The cowling brace is composed of a front brace member integrally formed of a synthetic resin material, a rear brace member assembled by using a metal material to be combined with the front brace member, a front fixture member formed integrally with the front brace member and adapted to fix the cowling and the cowling peripheral part, and a rear fixture member formed to rear brace member and adapted to fix the rear brace member to the body frame of the motorcycle.

Abstract: An outboard motor comprises an engine holder arranged to be mounted to a hull, an engine disposed in an upper portion of the engine holder in a mounted state thereof, an oil pan disposed in a lower portion of the engine holder, a crank shaft vertically disposed in the engine, a cam shaft disposed to extend in parallel to the crank shaft, and a lubricating device including an oil pump unit disposed to a lower surface of the engine holder and adapted to circulate an oil in the engine. The oil pump unit comprises a pump case having a case body to be mounted to the engine holder, a pump drive shaft operatively connected to the cam shaft for operating the oil pump disposed on the lower surface of the engine holder, suction port and discharge port. The pump drive shaft is detachably connected to the cam shaft to be slidable in a vertical direction in the mounted state, and the suction port and the discharge port operatively communicated with suction port and discharge port of the engine, respectively.

Abstract: An air-fuel ratio in an engine provided with an air-fuel ratio control unit is controlled, by using an oxygen sensor disposed in an exhaust gas passage in operative association with the air-fuel ratio control unit, by the steps of setting a feedback control mode for detecting states of the exhaust gas by using the oxygen sensor, operating the engine in one of a plurality of operating areas which are sectioned in accordance with an engine operational conditions such as engine revolution speed, determining a correction value of the air-fuel ratio in accordance with the engine operation with respect to a set value, and calculating another correction value of the air-fuel ratio in another operating area on the basis of the correction value previosly determined.

Abstract: A cooling apparatus for an outboard motor which is provided with a water-cooled engine in a vertical alignment in which a crank shaft is vertically disposed, the engine being composed of a cylinder block, a cylinder head and an exhaust manifold into which water jackets are formed respectively and the water jackets are supplied with cooling water from a water pump disposed below the engine in a state mounted to a hull, the cooling apparatus comprising a cylinder cooling-water passage for supplying cooling water from the water pump to the water jackets of the cylinder block and said cylinder head, an exhaust cooling-water passage for supplying cooling water from the water pump to the water jacket of the exhaust manifold, the cylinder cooling-water passage and the exhaust cooling-water passage being independently disposed from each other and being joined together at downstream portions thereof, a thermostat provided for the water jacket of the cylinder block and a sensor for detecting a temperature of a cylinder

Abstract: A motorcycle has a head pipe supporting a steering shaft, a pair of bilateral main frame pipes having front ends fixed to the head pipe and extending rearward therefrom, an engine unit disposed below the main frame pipes and having cylinders projecting obliquely forward from an engine casing, an air cleaner covered by an air cleaner casing which is disposed between both the main frame pipes, and intake devices extending upward from the cylinders and having air intake inlet portions inserted into the air cleaner casing. The air cleaner casing has a bottom portion to which a downwardly protruded portion is formed at a rear position of the intake devices, and the main frame pipes are connected through a first coupling member disposed between the intake devices and the protruded portion of the air cleaner casing. The air cleaner casing is formed with a recessed portion at the bottom portion thereof, and the recessed portion has a shape suitable for accommodating the first coupling member.

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 an engine of vertical type in which a crank shaft is disposed vertically in an installed state of the engine, an engine holder supporting the engine, an oil pan which is disposed below the engine through the engine holder and in which an oil is accumulated, and a lubricating device for lubricating the oil from the oil pan to an inside of the engine. The lubricating device comprises an oil pump mounted to a lower side portion of the engine holder and adapted to suck the oil accumulated in the oil pan, an oil suction passage and an oil discharge passage. The oil suction passage and oil discharge passage extend in parallel to each other from the oil pump and are formed integrally with an inside portion of the engine holder.

Abstract: An intake apparatus of an internal combustion engine for a vehicle comprises a duct for taking into a wind during a running of a vehicle, an air cleaner operatively connected to the duct, a fuel supply device for injecting a fuel into an intake air coming from the air cleaner, a movable valve arranged between an outlet port of the duct and an inlet port of the air cleaner, a negative-pressure motor for driving the movable valve, and an electronic control unit for controlling the movable valve. The electronic control unit is connected to an ignition means, and the electronic control unit controls the opening and closing of the movable valve in accordance with a rotational speed of an internal combustion engine, an opening degree of a throttle of the engine and a gear position of the engine as control parameters and carries out a delay angular control of an ignition timing in response to the opening and closing control of the movable valve.