Abstract: A cylinder head for an internal combustion engine is disclosed having an intake port geometry configured to reduce fuel puddling and improve fuel atomization. The cylinder head includes a housing having a recess defining a top portion of a combustion chamber. The cylinder head further includes intake and exhaust ports defined by channels extending from the top portion of the combustion chamber to an outer end of the housing. An intake valve is positioned within the cylinder head to control communication of the intake port with the combustion chamber, and an exhaust valve is positioned within the cylinder head to control communication of the exhaust port with the combustion chamber. The intake port further includes a cross-section having a modified D-shape with a single 90 degree corner. The modified D-shape cross-section extends substantially a length of the intake port.

Abstract: An engine assembly including an internal combustion engine, an oil cooler connected to the engine to receive heated oil and discharge cooled oil, and an engine cover mounted to the internal combustion engine and having an opening to receive the oil cooler therein.

Abstract: A system and method for engaging a slide-in mountable fuel pump assembly with a fan cover of an internal combustion engine is disclosed. The fuel pump assembly includes a fuel pump configured to pump fuel from a fuel source to the engine and a mounting bracket affixed to or formed integrally with the fuel pump and configured to slidingly engage a fan cover of the engine so as to enable selective mounting and removal of the fuel pump assembly to and from the fan cover. The mounting bracket further includes a main plate affixed to or formed integrally with the fuel pump and a track formed on each of opposing sides of the main plate, with the track configured to slidingly engage a mating feature formed on the fan cover of the engine so as to selectively mount the fuel pump assembly to the fan cover.

Abstract: An engine conversion kit for converting an engine that combusts gasoline to an engine that combusts a fuel other than gasoline, such as E85 which is 85 percent ethanol and 15 percent gasoline includes a carburetor having a vent passageway that defines a vent size, and an automatic choke system. The kit includes a second carburetor including a primer passageway and a second vent passageway having a second vent size that is smaller than the vent size. The second carburetor is adapted to attach to the engine and replace the carburetor. A primer bulb is configured to connect to the engine and is operable to force air into the primer passageway.

Abstract: An engine conversion kit for converting an engine that combusts gasoline to an engine that combusts a fuel other than gasoline, such as E85 which is 85 percent ethanol and 15 percent gasoline includes a carburetor having a vent passageway that defines a vent size, and an automatic choke system. The kit includes a second carburetor including a primer passageway and a second vent passageway having a second vent size that is smaller than the vent size. The second carburetor is adapted to attach to the engine and replace the carburetor.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway, and a slot in the interior wall of the intake passageway that receives an end of the first regulator. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: An intake manifold assembly includes an intake manifold having an inlet configured to receive an air/fuel mixture from a carburetor, an outlet configured to discharge the air/fuel mixture into a combustion chamber, an interior wall at least partially defining an intake passageway fluidly communicating the inlet and the outlet, and an aperture in the interior wall. The aperture is positioned between the inlet and the outlet. The intake manifold assembly also includes a first regulator received in the aperture and at least partially positioned in the intake passageway to effectively decrease the cross-sectional open area of the intake passageway. The first regulator is selectable from a plurality of regulators configured to each be at least partially positionable in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake manifold from the carburetor.

Abstract: An air/fuel mixing apparatus, configured for use with an internal combustion engine, includes a body defining a passageway therein, a throttle lever including a cam surface, a throttle valve positioned in the passageway and responsive to movement of the throttle lever, a choke lever including a follower surface configured to be engaged by the cam surface, and a choke valve positioned in the passageway and responsive to movement of the choke lever and the throttle lever. The air/fuel mixing apparatus also includes a solenoid configured to disengage the choke lever from the throttle lever, and move the choke valve to a substantially-opened position.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: An intake manifold assembly includes an intake manifold having an inlet configured to receive an air/fuel mixture from a carburetor, an outlet configured to discharge the air/fuel mixture into a combustion chamber, an interior wall at least partially defining an intake passageway fluidly communicating the inlet and the outlet, and an aperture in the interior wall. The aperture is positioned between the inlet and the outlet. The intake manifold assembly also includes a first regulator received in the aperture and at least partially positioned in the intake passageway to effectively decrease the cross-sectional open area of the intake passageway. The first regulator is selectable from a plurality of regulators configured to each be at least partially positionable in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake manifold from the carburetor.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway, and a slot in the interior wall of the intake passageway that receives an end of the first regulator. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: A governor for an engine including a speed sensor, a throttle member, a linkage, a primary spring, and a secondary spring. The speed sensor moves in response to changes in a speed of the engine. The linkage is coupled between the speed sensor and the throttle member to move the throttle member between a first position and a second position in response to the speed of the engine. The primary spring directly couples the throttle member to the engine to bias the throttle member in a first direction, and the secondary spring directly couples the throttle member to the engine to bias the throttle member in a second direction at least partially opposite to the first direction.

Abstract: A cap for covering an opening of a spout. The cap includes a top that defines an inner surface and an outer surface. An engagement portion extends from the inner surface and is adapted to engage the spout. A wall extends from the inner surface to define a container-receiving space and a pierce point extends from the inner surface and is at least partially disposed within the container-receiving space.

Abstract: An internal combustion engine including a carburetor. The internal combustion engine includes a choke valve disposed within the carburetor, and a choke lever interconnected with the choke valve for movement with the choke valve. The engine also includes a throttle valve disposed within the carburetor and a throttle lever interconnected with the throttle valve for movement therewith. An intermediate lever is disposed between the throttle lever and the choke lever for movement with the choke and throttle levers. In one embodiment, the engine includes a connecting link coupled between the choke and intermediate levers, the connecting link movable with movement of the choke lever such that movement of the choke lever is translated into movement of the intermediate lever.