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This article will discuss a very interesting subject: the operation and adjustment of different types of carburetors used on motorcycles. Contain information about : CARBURETOR: BASIC PRINCIPLES, THE VENTURI AND THE AIRFLOW CONTROL, THE IDLE CIRCUIT AND THE PROGRESSION, THE MAIN CIRCUIT, THE CARBURETOR:THE ADDITIONAL SYSTEMS. Otto cycle engines used to
power both two and four stroke motorcycles are fed with fuel (normal gasoline, special gasolines for some competition needs or, in some uncommon cases, methyl and/or ethyl alcohol), which is sufficiently volatile and has ignition properties which allow it to be premixed with the combustion air before the combustion is initiated by the spark plug. On the right, the main components of a Dell’Orto motorcycle carburetor are shown: 1. starting lever; 2. air intake; 3. venturi; 4. starter jet; 5. float chamber; 6. atomizer; 7. fuel valve; 8. needle; 9. throttle valve; 10. float chamber air intake; II. fuel connection; 12. Idle mixture adjusting screw; 13. throttle valve adju- sting screw; 14. float; 15. idle emulsion tube, 16.idle jet; 17. main jet. A modern needle type carburetor (Dell’Orto VHSB) is equipped with different circuits with relevant calibration jets to assure proper fuel delivery under all conditions. As we can see from the section diagram, each fuel circuit leads to the constant level float chamber. Beyond the configuration of the
throttle valve area, the connections with the air intake and the area downstream of the venturi, where the carburetor connects with the aspiration channel, are very important.

Tags : motorcycle carburetor, dell orto, stroke motorcycles, airflow control, ethyl alcohol, combustion air, throttle valve, needle type, otto cycle, proper fuel, cycle engines, fuel valve, gasolines, fuel delivery, air intake

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