Abstract: An oil supplying apparatus for supplying the oil to an engine of a watercraft can be provided with an oil sump, a vapor-liquid separation chamber, a scavenging pump for sending the oil in the oil sump to the vapor-liquid separation chamber, a transfer path for returning the oil from which air and blow-by gas have been separated in the vapor-liquid separation chamber to the oil sump, a feed pump for supplying the oil in the oil sump to the engine, and openings and for returning oil used to lubricate the engine to the oil sump. The oil sump can be provided below the crankcase, and the vapor-liquid separation chamber can be provided to a side surface of the engine.

Abstract: A throttle opening controller for one embodiment of a small planing boat includes: a throttle valve for changing the degree of opening in response to displacement of a throttle lever; a remaining fuel amount detector; a fuel consumption calculating means; and a throttle opening limiting means. In one embodiment, when a remaining fuel amount detected by the remaining fuel amount detector is equal to or below a preset value L1, the fuel consumption calculating means starts calculating total fuel injection amount. When a value, obtained by subtracting the total fuel injection amount from the preset value L1, is equal to or below a threshold L0, the throttle opening limiting means determines the degree of opening of the throttle valve based on an opening rate (k). An internal space of a fuel tank can be divided using a vertical partition into plural chambers. In addition, a knock sensor can be provided for an engine.

Abstract: An oil supplying apparatus for supplying the oil to an engine of a watercraft can be provided with an oil sump, a vapor-liquid separation chamber, a scavenging pump for sending the oil in the oil sump to the vapor-liquid separation chamber, a transfer path for returning the oil from which air and blow-by gas have been separated in the vapor-liquid separation chamber to the oil sump, a feed pump for supplying the oil in the oil sump to the engine, and openings and for returning oil used to lubricate the engine to the oil sump. The oil sump can be provided below the crankcase, and the vapor-liquid separation chamber can be provided to a side surface of the engine.

Abstract: A throttle opening controller for one embodiment of a small planing boat includes: a throttle valve for changing the degree of opening in response to displacement of a throttle lever; a remaining fuel amount detector; a fuel consumption calculating means; and a throttle opening limiting means. In one embodiment, when a remaining fuel amount detected by the remaining fuel amount detector is equal to or below a preset value L1, the fuel consumption calculating means starts calculating total fuel injection amount. When a value, obtained by subtracting the total fuel injection amount from the preset value L1, is equal to or below a threshold L0, the throttle opening limiting means determines the degree of opening of the throttle valve based on an opening rate (k). An internal space of a fuel tank can be divided using a vertical partition into plural chambers. In addition, a knock sensor can be provided for an engine.

Abstract: A lubricating apparatus for an internal combustion engine includes an oil pump 12 comprising a feed pump 13 and scavenging pumps 14 and 15. Then oil pump 12 and an oil tank 16 are arranged at the outside of the internal combustion engine 9. A pump shaft for the pumps 13, 14 and 15 can be arranged in a same direction as that of a crank shaft of the engine 9. The feed pump 13 and two scavenging pumps 14 and 15 are arranged in serial order with the feed pump being farthest from the engine 9. A check valve 24 can be arranged in a passage of the discharge side of the feed pump 13. A relief valve 23 can be arranged between a passage of the discharge side of the feed pump 13 and a passage of the intake side of the scavenging pump 14.

Abstract: A lubricating apparatus for an internal combustion engine includes an oil pump 12 comprising a feed pump 13 and scavenging pumps 14 and 15. Then oil pump 12 and an oil tank 16 are arranged at the outside of the internal combustion engine 9. A pump shaft for the pumps 13, 14 and 15 can be arranged in a same direction as that of a crank shaft of the engine 9. The feed pump 13 and two scavenging pumps 14 and 15 are arranged in serial order with the feed pump being farthest from the engine 9. A check valve 24 can be arranged in a passage of the discharge side of the feed pump 13. A relief valve 23 can be arranged between a passage of the discharge side of the feed pump 13 and a passage of the intake side of the scavenging pump 14.