A small combustion engine mechanism including an engine, a driven device powered by the engine. The engine having a ratcheting reel mechanism, a recoil starter housing, a shaft member coupled to the reel mechanism, and a bearing member coupled to the recoil starter housing. The shaft member being supported by the bearing member. The engine also has a tool engaging member coupled to the shaft member, the tool engaging member being accessible to a tool driver.

A small combustion engine mechanism including an engine, a driven device powered by the engine. The engine having a ratcheting reel mechanism, a recoil starter housing, a shaft member coupled to the reel mechanism, and a bearing member coupled to the recoil starter housing. The shaft member being supported by the bearing member. The engine also has a tool engaging member coupled to the shaft member, the tool engaging member being accessible to a tool driver.

A startup assistance device, which assists startup of an internal combustion engine in which fuel is supplied from an electronically controlled fuel injection device and ignition is performed by an ignition device, includes a recoil starter which is driven by manpower and which performs cranking for starting up the internal combustion engine, an electric rotary machine which adds torque to a crankshaft of the internal combustion engine during at least one of a startup period of the internal combustion engine using the recoil starter and a standby period before the startup period, a power source unit which supplies power to the electric rotary machine, and a control unit which controls the magnitude and time of the torque output by the electric rotary machine.

A system for starting an engine of a vehicle has a fuel injector injecting fuel into a closed intake port to form an air fuel mixture. The system also includes an actuator rotating a crankshaft in a first direction to open the intake port by moving a piston within a cylinder coupled to the crankshaft. A combustion chamber defines between the cylinder and the port receiving the air fuel mixture through the intake port. The actuator rotates the crankshaft in a second direction to close the intake port. A spark plug ignites the air fuel mixture to start the engine. The engine also includes many other disclosed features.

The control device includes a microcomputer which controls operation of the internal combustion engine, a power regulator which outputs a direct current regulated voltage regulated from electric power of the AC generator, a 5V regulator which receives an output from the power regulator and supplies it to the microcomputer; a first capacitor with a small capacity connected to an output of the power regulator, plural second capacitors connected in parallel with the first capacitor; and plural opening and closing means connected in series to the plural second capacitors, respectively. The opening and closing means are controlled to be opened and closed by the microcomputer so that the second capacitors are charged when the output of the power regulator has reached an ON voltage below the regulated voltage.

The present invention provides a batteryless engine system comprising a first detection unit configured to detect a rotation speed of an internal combustion engine, a second detection unit configured to detect a voltage of a capacitor in which charges are accumulated, and a control unit operated by a power supplied from a generator and configured to control supply of a power from the generator to an injector, a fuel pump, and an ignition device based on the rotation speed detected by the first detection unit and the voltage detected by the second detection unit in a starting period of the internal combustion engine by a recoil starter.

The present invention provides a batteryless engine system comprising a first detection unit configured to detect a rotation speed of an internal combustion engine, a second detection unit configured to detect a voltage of a capacitor in which charges are accumulated, and a control unit operated by a power supplied from a generator and configured to control supply of a power from the generator to an injector, a fuel pump, and an ignition device based on the rotation speed detected by the first detection unit and the voltage detected by the second detection unit in a starting period of the internal combustion engine by a recoil starter.

A multi-fuel engine includes an engine operable on a liquid fuel and first and second gaseous fuels. The multi-fuel engine also includes a liquid cutoff solenoid selectively operable between open and closed positions to allow and inhibit a flow of the liquid fuel to the engine and at least one gaseous cutoff valve selectively operable between open and closed positions to allow and inhibit a flow of the first and second gaseous fuels to the engine. A jet block couples the first gaseous fuel source and the second gaseous fuel source to a carburetor connected to an intake of the engine, with the jet block being located downstream from the at least one gaseous cutoff valve. The jet block includes a first gaseous fuel jet to meter the first gaseous fuel to the carburetor and a second gaseous fuel jet to meter the second gaseous fuel to the carburetor.

A dual fuel engine includes an engine operable on a gaseous fuel and a liquid fuel and a switch to change operation of the engine between gaseous fuel and liquid fuel. The dual fuel engine also includes a carburetor attached to an intake of the engine to mix air and fuel and connect to a gaseous fuel source and a liquid fuel source. A liquid fuel cut-off attaches to the carburetor to interrupt liquid fuel upon actuation of the switch from liquid fuel to gaseous fuel.

A starter device for an internal combustion engine has a rope pulley and a starter rope wound onto the rope pulley. A rope guide guiding the starter rope from the guide pulley to a rope outlet opening of the starter device is provided. A guide element positioned at the rope outlet opening holds the starter rope in the rope outlet opening. The rope guide has at least one deflection element that is arranged at the rope outlet opening. The deflection element has two tangents which are intersecting each other at an angle of less than 90. The deflection element has a minimal radius of a length that is longer than a length of a diameter of the starter rope. The starter handle can be positioned relative to the rope outlet opening at different orientations and enables ergonomic starting of the internal combustion engine of a backpack power tool.