Abstract: An internal combustion engine comprising an engine block including a combustion chamber, a fuel vapor separator, a fuel supply mechanism for introducing fuel to the combustion chamber, a conduit communicating between the fuel vapor separator and the fuel supply mechanism for introducing fuel, and a cooling jacket for cooling the fuel vapor separator.

Abstract: An apparatus comprising a fuel pump, an internal combustion engine having an oil pressure and including an engine block and a crankshaft rotatably supported by the engine block, the apparatus further comprising structure for providing a first electrical signal while the engine is running, a starter selectively operable to rotate the crankshaft, structure for providing a second electrical signal while the starter rotates the crankshaft, and structure for causing the fuel pump to supply fuel to the internal combustion engine only while at least one of the first and second signals is present and without regard to the oil pressure of the internal combustion engine.

Abstract: A device for draining carburetors which do not have a float chamber drain. The device is a screw which has an internal passageway. The internal passageway has a longitudinal passageway beginning at the head of the screw and a transverse passageway which communicates with the float chamber and intersects the longitudinal passageway. A drain plug is threaded into the longitudinal passageway near the head of the screw.

Abstract: A carburetor comprising a combined float bowl and venturi section including an air passage with a venturi, a rotatably supported throttle valve plate located in the air passage, and a float chamber adapted to contain fuel, and a separate metering section mounted on the float bowl and venturi section, the metering section being molded of plastic and including a fuel passage communicating between the float chamber and the air passage, a needle valve seat within the fuel passage, an internally threaded bore having therein threads molded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out of engagement with the valve seat for controlling fuel flow through the fuel passage.

Abstract: An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first series of inlet openings aligned in the direction of the crankshaft axis, and a second series of inlet openings aligned in the direction of the crankshaft axis, the first and second series being laterally offset with respect to the direction of the crankshaft axis, and each of the inlet openings of the first and second series being respectively adapted to feed air to one of the crankcase chambers and having a minor dimension parallel to the crankshaft axis, a major dimension transverse to the crankshaft axis, and a portion overlapping the inlet openings of the other of the first and second series.

Abstract: Disclosed is an engine fuel flow restriction warning system comprising an engine including a first conduit means connecting a fuel storage means and a fuel pumping means. A second conduit means connects a fuel pumping means with an engine fuel inlet means. Pressure sensing means communicates with the first conduit means, and the pressure sensing means operates a warning means to produce a warning when the pressure in the first conduit means reaches a predetermined low level. When used with an engine including a cooling system and a cooling system temperature sensing means communicating with the engine cooling system, the temperature sensing means operates the same pressure warning means to produce a warning when the temperature in the engine cooling system reaches a predetermined level.

Abstract: Disclosed herein is a two stroke internal combustion engine comprising first and second alternately fired cylinders, first and second crankcases respectively extending from the first and second cylinders, first and second carburetors respectively including first and second air induction passages respectively extending from the first and second crankcases, first and second reed valves respectively affording communications between the first and second crankcases and the first and second air induction passages, first and second throttle valves respectively movably mounted in the first and second air induction passages, first and second idle speed ports respectively communicating with the first and second air induction passages in the respective areas between the first and second throttle valves and the first and second reed valves, and a conduit communicating between the first and second idle speed ports.

Abstract: A fuel feed system for supplying fuel to a combustion chamber of a first internal combustion engine and to a combustion chamber of a second internal combustion engine. The fuel feed system includes a fuel tank, and a first fuel pump including an outlet, and an inlet communicating with the fuel tank. The system also includes a fuel vapor separator including a first outlet, a second outlet, and an inlet communicating with the first fuel pump outlet, a second fuel pump communicating with the fuel vapor separator first outlet and communicating with the first engine combustion chamber, and a third fuel pump communicating with the fuel vapor separator second outlet and communicating with the second engine combustion chamber.

Abstract: An engine apparatus comprising an internal combustion engine including a timer plate including thereon a throttle controlling cam, a carburetor mounted on the engine and including a throttle valve, and an actuating lever operably connected to the throttle valve, a cam follower assembly including a rocker arm pivotally mounted on the engine and having an end, a roller rotatably mounted on the rocker arm end and including an outer surface, and an abrasion resistant sleeve member on the roller outer surface, a spring biasing the cam follower assembly for engaging the sleeve member in rolling contact with the throttle controlling cam, and a link connecting the rocker arm to the actuating lever for actuating the throttle valve in response to movement of the timer plate.

Abstract: An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first series of inlet openings aligned in the direction of the crankshaft axis, and a second series of inlet openings aligned in the direction of the crankshaft axis, the first and second series being laterally offset with respect to the direction of the crankshaft axis, and each of the inlet openings of the first and second series being respectively adapted to feed air to one of the crankcase chambers and having a minor dimension parallel to the crankshaft axis, a major dimension transverse to the crankshaft axis, and a portion overlapping the inlet openings of the other of the first and second series.

Abstract: A marine propulsion device comprising a propulsion unit including a rotatably mounted propeller, and an engine drivingly connected to the propeller and comprising an engine block, a spark timing mechanism, a fuel supply mechanism, a control lever supported by the engine block, a mechanism for displacing the fuel supply mechanism from an idle setting to a full speed setting in response to movement of the control lever from an idle position to a full speed position, and a spark timing control mechanism for permitting movement of the control lever from the idle position to a first intermediate position without displacing the spark timing mechanism from a minimum spark advance setting, for displacing the spark timing mechanism from the minimum spark advance setting to a maximum spark advance setting in response to movement of the control lever from the first intermediate position to a second intermediate position, and for displacing the spark timing mechanism from the maximum spark advance setting to an intermedi

Abstract: A marine propulsion installation for use on a boat having an exterior and an interior, the marine propulsion installation comprising an engine, and a rotatably mounted propeller driven by the engine, a source of fuel adapted to be located interiorly of the boat, a supply conduit communicating between the source of fuel and the engine, and a fuel impermeable housing conduit sealingly connected to the source of fuel and surrounding the portion of the supply conduit located interiorly of the boat.

Abstract: An engine comprises a combustion chamber and a fuel transfer passage having a fuel outlet port communicating with the combustion chamber. A primary fuel delivery system communicates with the combustion chamber and introduces fuel from the fuel source into the combustion chamber. The engine further comprises a fuel pump which is adapted to be connected with a source of fuel and a fuel return line having a first end communicating with the source. A mechanism selectively controls the communication of the fuel pump with either the fuel return line or the fuel transfer passage, so that an enriched flow of fuel can be selectively supplied to the combustion chamber prior to and after starting.

Abstract: A manual starter is provided for an internal combustion engine including a drive member mounted for rotation and operable to start the engine when rotated. The starter includes a flexible pull element mounted for movement between a normally retracted position and an extended position, a mechanism for drivingly engaging the drive member when the flexible pull element is pulled to the extended position, and a retracting mechanism for returning the pull element from the extended position to the retracted position. The starter also includes a guide roller mounted for rotation and in frictional contact with the flexible pull element, and a mechanism responsive to rotation of the guide roller for retarding ignition spark timing as the flexible pull element moves toward the extended position, and for not retarding ignition spark timing as the flexible pull element moves toward the retracted position..

Abstract: The internal combustion engine includes a carburetor having an air induction passage communicating with the engine combustion chamber and a throttle valve mounted inside the induction passage for pivotal movement between an idling speed position and a range of high speed positions, a primary fuel delivery system including a fuel pump for supplying fuel to the carburetor during normal engine operation, and a secondary fuel delivery system for supplying a flow of enrichment fuel to the engine combustion chamber, independently of the primary fuel delivery system, during periods of rapid engine deceleration.

Abstract: A system for priming and temporarily enriching the air/fuel mixture for a crankcase scavenged, two-cycle engine having a fuel pump supplying fuel to a carburetor for mixture with air for delivery to an induction manifold leading to the engine crankcase where it is compressed and transferred to the cyclinder combustion chamber through a passage, the system includes a solenoid valve controlled by a switch so the valve opens when the switch is turned on to start the engine. The valve inlet is connected to the fuel pump. The valve outlet is connected to a conduit means which is connected to the transfer passage to inject fuel to prime the engine. The valve outlet is also connected to a conduit connected to the induction manifold to enrich the air/fuel mixture therein. The fuel in conduits is drawn into the manifold after said valve closes to thereby enrich the air/fuel mixture long enough for the engine to warm up.

Abstract: An engine overheat warning system for an internal combustion engine, which system includes a source of gas with a pressure different from atmospheric pressure and a pneumatic horn. The engine overheat warning system also includes a conduit communicating between the source of gas and the pneumatic horn and a temperature sensing valve located in the conduit and connected to the engine for causing communication between the source of gas and the pneumatic horn when the engine reaches an overheat condition. When the source of gas and pneumatic horn are thus in communication, the pneumatic horn produces an audible engine overheat warning.In one embodiment, the source of gas with a pressure different from atmospheric pressure is an intake manifold of an internal combustion engine.

Abstract: An engine comprises a combustion chamber and a fuel transfer passage having a fuel outlet port communicating with the combustion chamber. A primary fuel delivery system communicates with the combustion chamber and introduces fuel from the fuel source into the combustion chamber. The engine further comprises a fuel pump which is adapted to be connected with a source of fuel and a fuel return line having a first end communicating with the source. A mechanism selectively controls the communication of the fuel pump with either the fuel return line or the fuel transfer passage, so that an enriched flow of fuel can be selectively supplied to the combustion chamber prior to and after starting.

Abstract: Disclosed herein is a carburetor including a housing having a throat, means for supplying fuel to the throat intermediate its opposite ends, the fuel supplying means including a tube extending into the throat and including a plurality of fuel supply openings spaced along its length. A pivotable throttle member is positioned in the throat intermediate its opposite ends and is pivotable between a fluid flow restricting position and an open position. The pivotable throttle member includes a cam surface. The carburetor is also constructed such that an increased number of the openings supply fuel to the throat as the throttle member pivots from a fluid flow restricting position to an open position and the openings are closed as the throttle member pivots from an open position to a fluid flow restricting position.

Abstract: An internal combustion engine comprises a combustion chamber and a crankcase which extends from the combustion chamber. A primary fuel delivery system introduces fuel from a fuel source into the combustion chamber, and a primer fuel delivery system is selectively operable for introducing fuel from the source into the combustion chamber in addition to fuel which is introduced by the primary fuel delivery system. A collector assembly communicates with the crankcase for accumulating residual fuel from the crankcase, and a residual fuel delivery system supplies fuel from the collector assembly into the combustion chamber. A control valve mechanism is connected to the primer fuel delivery system and the residual fuel delivery system for blocking the supply of fuel by the residual fuel delivery system during operation of the primer fuel delivery system.