A carburetor for the combustion engine in a handheld work apparatus has a carburetor housing in which a carburetor drum is mounted rotatably about a pivot axis. The carburetor drum has a drum body which has at least one channel which runs transversely with respect to the pivot axis and forms an intake channel portion. A sensing unit for sensing at least one rotational position of the carburetor drum is provided. The sensing unit includes a control contour and a sensing device interacting with the control contour. The control contour is formed on the carburetor drum. A method for operating a combustion engine makes provision for the control device to control the supplied quantity of fuel depending on the rotational position, sensed by the sensing unit, of the carburetor drum.

The present disclosure relates to a carburetor assembly (7) comprising a control unit (17), an air channel (8), a throttle valve (9), a choke valve (10), a pulsed fuel valve (11), and a fuel supply line (12). The control unit (17) is adapted to control the fuel valve (11) to supply fuel in accordance with a certain start setting, where the choke valve (10) can be open or closed. The carburetor assembly (7) comprises a rotation angle detector assembly (20) with a choke detector part (29) that is mounted to a choke shaft (30) that is connected to the choke valve (10) such that the choke detector part (29) is arranged to rotate together with the choke valve (10). The rotation angle detector assembly (20) further comprises a choke sensor device (23, 33) that is connected to the control unit (17) and can be affected by the choke detector part (29) such that the choke sensor device (23, 33) provides different output signals to the control unit (17) in dependence of whether the choke valve (10) is open or closed.

The present disclosure relates to a carburetor assembly (7) comprising a control unit (17), an air channel (8), a throttle valve (9), a choke valve (10), a pulsed fuel valve (11), and a fuel supply line (12). The control unit (17) is adapted to control the fuel valve (11) to supply fuel in accordance with a certain start setting, where the choke valve (10) can be open or closed. The carburetor assembly (7) comprises a rotation angle detector assembly (20) with a choke detector part (29) that is mounted to a choke shaft (30) that is connected to the choke valve (10) such that the choke detector part (29) is arranged to rotate together with the choke valve (10). The rotation angle detector assembly (20) further comprises a choke sensor device (23, 33) that is connected to the control unit (17) and can be affected by the choke detector part (29) such that the choke sensor device (23, 33) provides different output signals to the control unit (17) in dependence of whether the choke valve (10) is open or closed.

A fuel enrichment simple starting device for a carburetor includes a fuel cup and a main body, which includes a mixing room, a metering room, a fuel chamber separated into a fuel pumping chamber and a fuel enrichment chamber, a fuel inputting passage, a fuel passage, a starting passage and a fuel returning passage. The fuel pumping chamber and the fuel enrichment chamber are in communication with the fuel cup. One end of the fuel inputting passage is in communication with the fuel enrichment chamber, and the other end thereof is in communication with the metering room. One end of the starting passage is in communication with the fuel enrichment chamber, and the other end thereof is in communication with the mixing room. One end of the fuel returning passage is in communication with the fuel cup, and the other end thereof is in communication with a fuel tank.

A fuel enrichment simple starting device for a carburetor includes a fuel cup and a main body, which includes a mixing room, a metering room, a fuel chamber separated into a fuel pumping chamber and a fuel enrichment chamber, a fuel inputting passage, a fuel passage, a starting passage and a fuel returning passage. The fuel pumping chamber and the fuel enrichment chamber are in communication with the fuel cup. One end of the fuel inputting passage is in communication with the fuel enrichment chamber, and the other end thereof is in communication with the metering room. One end of the starting passage is in communication with the fuel enrichment chamber, and the other end thereof is in communication with the mixing room. One end of the fuel returning passage is in communication with the fuel cup, and the other end thereof is in communication with a fuel tank.

An improved carburetion system is provided. The carburetion system embodied in the present invention relocates the throttle plate anterior to venturi in an oversized throttle plate bore. By removing the throttle plate and shaft and its inherent interference imposed on the air/fuel mixture flow in the post-venturi chamber, the present invention delivers an increased cubic volume of uniform turbulent air/fuel mixture flow to the intake manifold. As a result, increasing the power at full throttle operation relative to the prior art.

A carburetor with a throttle valve is provided in which a linkage member is in communication with the throttle valve. An idle down handle can be moved from an unactuated position to an actuated position and is in communication with the throttle valve. Movement of the idle down handle to the actuated position causes the throttle valve to be placed into the closed position. When the idle down handle is in the unactuated position the throttle linkage member can cause the throttle valve to be moved back and forth between the open and closed positions.

A carburetor with a throttle valve is provided in which a linkage member is in communication with the throttle valve. An idle down handle can be moved from an unactuated position to an actuated position and is in communication with the throttle valve. Movement of the idle down handle to the actuated position causes the throttle valve to be placed into the closed position. When the idle down handle is in the unactuated position the throttle linkage member can cause the throttle valve to be moved back and forth between the open and closed positions.

The present disclosure discloses a throttle and choke control linkage mechanism of carburetor including a choke shaft rotatably installed with a choke valve, a throttle shaft rotatably installed with a throttle, a choke handle fixed on the choke shaft and configured for rotating the choke valve from a fully opened position to a fully closed position, a throttle grip fixed on the throttle shaft and configured for rotating the throttle from an idling position to an opened position, and a fast idle handle rotatably around the choke shaft. The choke handle is further provided with a first surface which is able to link with the throttle grip. When the choke handle is linked with the throttle grip, the choke valve is at the fully closed position, and the throttle is opened with an angle larger than the idling position.

The present disclosure discloses a throttle and choke control linkage mechanism of carburetor including a choke shaft rotatably installed with a choke valve, a throttle shaft rotatably installed with a throttle, a choke handle fixed on the choke shaft and configured for rotating the choke valve from a fully opened position to a fully closed position, a throttle grip fixed on the throttle shaft and configured for rotating the throttle from an idling position to an opened position, and a fast idle handle rotatably around the choke shaft. The choke handle is further provided with a first surface which is able to link with the throttle grip. When the choke handle is linked with the throttle grip, the choke valve is at the fully closed position, and the throttle is opened with an angle larger than the idling position.