![]() ![]() If you have a not so glamorous moment and your bike goes down the carburettor can become flooded and excess fuel can pour out of the breathers. To firstly address why the breathers are as long as they are, this is a safety precaution. The result is your bike will often cough and splutter, or die altogether.Ĭan I Reroute Carburettor Breathers Under The Seat? So, when you ride your bike into a deep section of water, the ends of the carburettor breathers will be immersed in water blocking the flow of air required to maintain atmospheric pressure within the carburettor. ![]() The job of the carburettor breathers is to allow air movement and pressure compensation within the carburettor reservoir area to maintain the level of atmospheric pressure so the carburettor can function correctly. This works on the basis that air flowing past the venturi in the carburettor has a lower static pressure (the faster air moves the lower its static pressure) while the fuel supply remains at atmospheric pressure (14.7 psi at sea level) allowing the process of the fuel to be successfully drawn into the flow of air and mix. Fuel that is held in the carburettor reservoir (fuel bowl) is then drawn into this flow of air through the jets to create the ideal ratio of fuel and air for combustion. Your throttle does not directly control the flow of fuel, instead it actuates a mechanism in the carburettor that metres the flow of air being drawn into the engine. Without going into technical specifics a basic overview of how a motorbike carburettor works will make this clear. The carburettors on some motorbikes are setup from factory to tackle deep water crossings however most are not, so if your bike falls into the latter category a bit of replumbing will most likely be required. If you have ever pointed your motorbike at a section of deep water only to find your engine coughs and splutters or even dies, it’s highly likely your carburettor breathers are not plumbed to handle this.
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