Abstract: A carburetor has a carburetor body having a venturi passage that conveys air from an air inlet to an air outlet. A throttle valve controls flow of the air in the venturi passage. The throttle valve is movable into a closed position, an open position, and at least one transition position between the closed position and the open position. A fuel bowl holds fuel for mixing with the air in the venturi passage. A main nozzle discharges the fuel from the fuel bowl to the air in the venturi passage when the throttle is in the open position. A secondary circuit that is smaller than the main nozzle discharges fuel from the fuel bowl to the air in the venturi passage when the throttle is in the closed position, the transition position, and the open position. A filter is configured to remove particulate matter from the fuel in the fuel howl prior to discharge via the secondary circuit. Methods are for making the carburetor and operating the carburetor.

Abstract: In a premixed compression self-ignition engine which is compact but capable of exerting a high output, an intermediate portion of a trigonal link is rotatably supported on a crankpin, a large end portion of a connecting rod is connected to one end portion of the trigonal link, and a swing link swingably supported on a fulcrum shaft is connected to another end portion of the trigonal link. The engine includes: an intake port open to a crank chamber; a reed valve mounted in the intake port; a scavenging port configured to guide fresh air from the crank chamber into a cylinder bore in a downward stroke of a piston; an exhaust port provided in a cylinder head and open to a top portion of the cylinder bore; and an exhaust valve configured to be opened before the piston opens the scavenging port in the downward stroke of the piston.

Abstract: An operator-controllable valve opens or closes an idle air bypass passage in a motorcycle, allowing an operator astride the motorcycle to set an idle position manually. A handle permits a first adjustment by the operator without use of a screwdriver or other hand tool. An additional interface enables a wider range of adjustment using a hand tool. Both interfaces vary depth of an air mixture screw of the valve within an idle air bypass passage of a throttle body. Dual cylindrical members of the valve rotate relative to one another and relative to a base of the valve, each cylindrical member driven by one of the interfaces. Locking the cylindrical members together such that both rotate in tandem upon the operator moving the handle is accomplished by either tightening the handle or tightening a nut coupling the handle to the valve. A handlebar adjustment lever may couple with the handle.

Abstract: An throttle body for rotating a valve shaft of an air-intake throttle valve through a decelerating mechanism by a motor and change the opening area of an air-intake passage by rotating the valve shaft is equipped with a lever portion that is disposed so as to be interlocked with the decelerating mechanism and regulates the opening degree of the air-intake throttle valve under the full-open state, and an adjusting screw that is threadably inserted from the outside of the body portion and abuts against the lever portion in the body portion to change the opening degree of the air-intake throttle valve under the full-open state.

Abstract: An electronic engine controller utilizes a controller network interface for direct communication between an electronic engine control unit associated with an engine and the controller to monitor and control the engine. The controller uses a microprocessor and custom programmable software to monitor and determine operational parameters as well as institute and send electronic commands to the electronic control unit in a pre-determined response operational framework. The controller monitors certain engine operational parameters when enabled. If the engine remains in an unloaded condition for an extended period of time, the controller automatically throttles the engine down to idle condition to save fuel. It does this by issuing commands to the electronic control unit which controls operational functions or parameters of the engine. The engine parameters and idle time are configurable, allowing the setup to be optimized for a particular method of operation, regardless of the specific application.

Abstract: The invention aims to prevent the dust passing through a gap provided for sliding movement of bypass valve from being attached to a screw mechanism, and thus to guarantee smooth motion of the screw mechanism. Provided is a bypass-intake-flow control apparatus including a throttle body in which a bypass and a valve hole that is open into the course of the bypass are formed. A bypass valve to open and close the bypass is slidably but not rotatably fitted into the valve hole. An actuator is attached to the throttle body with an output shaft arranged coaxially with the bypass valve. The screw mechanism links the output shaft and the bypass valve. A bottomed hollow portion is formed in the bypass valve with an opening facing the actuator. A dust cover that surrounds the screw mechanism in the hollow portion is attached to the throttle body.

Abstract: A safety lockout device for a level throttle control of a vehicle includes a rocker or toggle stop mounted to be engageable with a throttle arm to lock out movement of the arm. A release is connected to the stop so as to move the stop against a restorative form applied by a biasing element away from the arm and permit the throttle to be operated. Upon the throttle arm moving back to an idle position the biasing element moves the stop back to its lock out position.

Abstract: The invention aims to prevent the dust passing through a gap provided for sliding movement of bypass valve from being attached to a screw mechanism, and thus to guarantee smooth motion of the screw mechanism. Provided is a bypass-intake-flow control apparatus including a throttle body in which a bypass and a valve hole that is open into the course of the bypass are formed. A bypass valve to open and close the bypass is slidably but not rotatably fitted into the valve hole. An actuator is attached to the throttle body with an output shaft arranged coaxially with the bypass valve. The screw mechanism links the output shaft and the bypass valve. A bottomed hollow portion is formed in the bypass valve with an opening facing the actuator. A dust cover that surrounds the screw mechanism in the hollow portion is attached to the throttle body.

Abstract: A system having a screw structure includes a casing and a self-tapping screw. The casing includes a through hole. The self-tapping screw includes a male thread portion and an unthreaded column portion arranged relative to each other in a longitudinal direction of the self-tapping screw, and is threadably coupled to the casing through the through hole. The through hole includes a large diameter hole portion and a small diameter hole portion. The large diameter hole portion is engaged with the male thread portion. The small diameter hole portion is engaged with the unthreaded column portion. The large diameter hole portion has a longitudinal length shorter than a longitudinal length of the unthreaded column portion.

Abstract: An idling engine speed control system for a vehicle comprises a valve which is provided within an air-intake passage connected to an engine mounted in the vehicle and is configured to substantially open and close the air-intake passage, a drive device configured to open and close the valve, an opening degree controller configured to drive the drive device and is configured to control an opening degree of the air-intake passage, an input device which is attached to the vehicle and is configured to input a target engine speed in an idling state, and an engine speed memory configured to store the target engine speed input with the input device, wherein the opening degree controller is configured to control the opening degree of the air-intake passage in an idling state according to the target engine speed stored in the engine speed memory.

Abstract: To make a motor to control throttle valve opening degree compact and reduce electricity consumption, a throttle valve lever (4) attached to a throttle valve shaft (3) has a roller (4b) and an operating arm portion (4a), a loosely fitted lever (8) is arranged to the throttle valve shaft (3), the operating arm portion (4a) is arranged in a gap (S) between first and second locking portions (8a1, 8a2) of the loosely fitted lever (8), a cam surface (7a) of a cam lever (7) connected to an output shaft (Ma) of a lead screw type step motor (M) faces to the roller (4b), a throttle valve operating drum (11) is coupled to the loosely fitted lever (8) via a link cover (13) and, when the motor (M) is driven, the cam lever (7) rotates the throttle valve lever (4) and the arm portion (4a) rotates within the gap (S) to hold an idling opening degree.

Abstract: To avoid interference of control wires and make a throttle control apparatus to be compact, the apparatus is structured such that a drive lever is mounted on one end of a throttle valve shaft protruding from one side outer wall of the throttle body and connected to a throttle lever, a throttle opening sensor is mounted on another end of the throttle valve shaft protruding from another side outer wall, a bypass air control apparatus having a bypass air passage and an air valve is provided on the other side wall, accelerator wires connected to the throttle lever and initial operation wire connected to the air valve are arranged at opposite sides of the intake passage respectively, so that the operating directions thereof are substantially the same to one another.

Abstract: An internal combustion engine is provided, and has a throttle element mounted in the intake channel of the engine so as to be pivotable, via a throttle shaft, between an idling position and a full-load position. An abutment is fixedly connected with the throttle shaft. In the idling position, the abutment rests against a stop element that is fixed in position on the intake channel. The stop element is adjustable and establishes the idling position of the throttle element. The abutment forms, with the stop element, a switch that is actuated in the idling position of the throttle element.

Abstract: An internal combustion engine is provided, and has a throttle element mounted in the intake channel of the engine so as to be pivotable, via a throttle shaft, between an idling position and a full-load position. An abutment is fixedly connected with the throttle shaft. In the idling position, the abutment rests against a stop element that is fixed in position on the intake channel. The stop element is adjustable and establishes the idling position of the throttle element. The abutment forms, with the stop element, a switch that is actuated in the idling position of the throttle element.

Abstract: An induction system for a marine engine is provided. The induction system selectively provides additional intake air to the watercraft when a rider docks the watercraft. The additional intake air provides docking thrust to the watercraft, enabling the rider to more easily maneuver the watercraft during a docking maneuver, for example.

Abstract: A linkage assembly for a vehicle having a vehicle body and an engine mounted thereto. The linkage assembly is operably disposed between a user-operable speed control input mechanism, e.g., a foot-operated accelerator, and the engine. The linkage assembly includes first and second linkage bodies and sets the idle and maximum speed of the engine without restricting the range of movement of the input mechanism. The linkage assembly may also include two adjustable stop mechanisms for limiting the travel of one of the linkage bodies and thereby providing for the independent adjustment of the idle and maximum engine speeds.

Abstract: A linkage assembly for a vehicle having a vehicle body and an engine mounted thereto. The linkage assembly is operably disposed between a user-operable speed control input mechanism, e.g., a foot-operated accelerator, and the engine. The linkage assembly includes first and second linkage bodies and sets the idle and maximum speed of the engine without restricting the range of movement of the input mechanism. The linkage assembly may also include two adjustable stop mechanisms for limiting the travel of one of the linkage bodies and thereby providing for the independent adjustment of the idle and maximum engine speeds.

Abstract: A hot water type first idle control device includes a heating chamber through which cooling water for an engine is allowed to flow, a wax case heated by the heating chamber, and a device housing in which the wax case is accommodated and retained. In the hot water type first idle control device, the heating chamber is integrally defined in the device housing to adjoin the wax case with a partition wall interposed therebetween for separating the heating chamber from the inside of the device housing. Thus, it is possible to effectively heat the wax case by hot water, while preventing the entering of the hot water into the device housing.

Abstract: A vehicle electronic throttle control assembly includes a position controlling device that automatically returns the throttle assembly components to a home position. A generally arcuate spring interacts with a plate portion supported on a shaft that is associated with the throttle blade portion. The natural bias of the spring biases the shaft and blade portion into a home position. The position controlling device accommodates situations where the electric motor assembly of the throttle control arrangement fails to operate as desired or does not receive proper power or command signals, for example.

Abstract: A throttle valve (12) is provided in an intake air passage (11) of a throttle body (10) and serves to control the air flows rate that is supplied into a combustion chamber of an internal combustion engine. A valve housing (21) is joined to the throttle body (10). A communication passage (22) is formed in the valve housing (21). A branching side passage (13a) and a joining side passage (13b) are formed in the throttle body 10 and, together with the communication passage (22) in the valve housing (21), form a bypass structure (13) that bypass the throttle valve (12). A valve seat portion (23) is formed on the valve housing (21) in the communication passage (22). A valve (25) is provided in the valve housing (21) and serves to control the opening area of the valve seat portion (23). A lattice (50) is disposed downstream of the valve seat portion (23) in the bypass structure (13).

Abstract: A throttle valve for throttling the combustion air flow for an internal combustion engine is disclosed, having a body with a throat, a butterfly in the throat to throttle flow, and a shaft connected to the butterfly to operate it. The shaft has an arm that abuts a throttle stop to maintain the butterfly in an almost-closed (or idle) position. The arm has an opening that permits access to the head of the throttle stop to adjust the throttle stop when the throttle valve is in the almost-closed position. The opening is located so that a tool such as a hex wrench can pass through the opening and engage a socket in the head of the throttle stop, pemitting it to be rotated and adjusted. The throttle shaft and arm are preferably integrally molded of plastic, and the throttle stop head is preferably larger than the threaded shaft of the throttle stop.

Abstract: A throttle lever assembly for controlling the actuation of a throttle valve in an internal combustion engine has a throttle shaft pivotally secured to a housing. An idle stop lever is mounted to and radially extends from an end portion of the shaft for engaging a depending member of the housing to stop the rotation of the throttle lever assembly at an idle position. A return cam formed of thermoplastic/thermoset material is overmolded the end portion of the shaft and a portion of the idle stop lever. The molded return cam has a channel disposed about its cam surface for receiving an accelerator cable, a stud extending axially from the outer surface of the cam return, and a spring retainer extending axially from the inner surface of the return cam for maintaining a return spring in coaxial relationship with the shaft. The return cam may also include an idle stop member to replace the discrete idle stop lever.