What are the structures of a motorcycle carburetor?

[VonMelanie]

A simple carburetor consists of three parts: upper, middle, and lower. The upper part includes the air intake and float chamber, the middle part has the venturi, jet, and spray tube, and the lower part includes the throttle valve. Function of the carburetor: The carburetor mixes air and gasoline in the correct proportion to provide combustion power for the cylinder. The carburetor has a throttle piston that moves up and down to control the amount of air intake. A needle valve passes through the main fuel jet in the middle of the throttle piston. The up and down movement of the throttle piston simultaneously drives the needle valve to control the fuel quantity. When the throttle is applied, the throttle cable drives this throttle piston to move up and down, providing combustion power to the cylinder and controlling the engine speed. Working process of the carburetor: The carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum generated by the engine's operation. Essentially, it atomizes the gasoline and mixes it with air.

[LaJackson]

I often deal with motorcycle repairs, and the structure of the carburetor has quite a few details. It includes a float chamber, where a float rises and falls with the fuel level to control the fuel amount and prevent overflow; the nozzle is responsible for delivering fuel, and its size determines the fuel injection volume; the throttle valve is connected to the throttle cable, and its opening and closing control the air flow rate; the intake port is designed as a narrow tube to accelerate air passage and create negative pressure; the mixing chamber combines fuel and air to create a combustible mixture; there are also adjustment screws to fine-tune the mixture ratio. If the float gets stuck, fuel may leak; if the nozzle is clogged, the engine will jerk. The overall structure is precise but prone to issues, so it's recommended to regularly clean and inspect these components to ensure smooth riding.

[McMaya]

As a motorcycle enthusiast, I've studied the construction of carburetors. The core components include a float bowl to maintain constant fuel level, adjustable nozzles for fuel delivery, a throttle valve to regulate airflow, a venturi tube to accelerate air and increase suction, and a mixing chamber to combine them into a fine mist. These parts work in harmony - for example, when the throttle opens wider, increased airflow draws more fuel. Older bikes often suffer from rusted floats or clogged nozzles causing fuel starvation, resulting in weak acceleration while riding. Maintenance is straightforward with specialized cleaners, making the relatively simple and reliable structure ideal for DIY repairs.

[DeSawyer]

As a beginner rider, I have some understanding of carburetor structure. It has a float section to control fuel, a throttle valve to adjust air intake, and a jet to release gasoline, all mixing uniformly in the mixing zone for the engine. The float acts like a small boat floating on fuel, the throttle valve opens and closes like a door, and the system operates by using airflow suction to draw fuel. Common issues include difficulty starting due to clogged fuel lines, but the structure isn't complex—just a few components can explain it clearly.