how a carburetor works motorcycle

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Venturi effect

People also ask


  • How does a carburetor work?

  • The vacuum moves around the carb and gas is pulled through different jets and is vaporized as it is pulled into the combustion chamber. Different jets and air passages in the carb are controlled by different throttle positions. At certain throttle positions, some of the systems will overlap.

  • What controls the fuel level in a motorcycle carburetor?

  • The fuel levels in your motorcycle鈥檚 carbs are controlled by the floats and the float valve/needle seat. Carb floats are made of material that floats in gas.

  • What are the circuits on a motorcycle carburetor?

  • Early bike carbs had two circuits, the idle circuit and the high speed circuit. A 鈥渃ircuit鈥?can be thought of as the portion of the throttle that that particular fuel path controls.

  • How does a carburetor restrict airflow?

  • This flap is closed manually to restrict airflow at the end of the carb away from the engine. It lets the engine suck against it, so fuel can come in easily, but the restriction on air makes the engine very rich, easing starting. Photo by Lemmy.