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Tuning of Weber carburetors All Weber carburetors have four circuits. Idle Cross-over High Speed Accelerator Idle and Cross-over - These circuits are inter-connected, in that the Idle jet is responsible for the fuel supply for both circuits. It provides fuel to the idle mixture screw (responsible for idle supply up to about 1500 RPM), and the crossover ports, which are hidden behind the throttle butterfly and come into play as soon as the throttle is opened. The idle jets work because of the vacuum created by the running engine, and the crossover ports discharge fuel because the incoming air literally 'sucks' the fuel into the air-stream. The cross-over ports provide additional fuel in this critical phase. If the idle jet is too small, then there is insufficient fuel to satisfy the needs of both the idle jet and cross-over ports, as both circuits are active simultaneously. Dan Georgescu Semiologie Medicala Pdf PdfIf the fuel supply is not sufficient, then the 'sudden' rush of air when you open the throttle butterflies, will cause the carburetor to go lean and the engine will stumble. Of course once the butterfly is fully open, the vacuum on the intake tract drops, and the motor is running on the main jet and air corrector jets only. The crossover ports and the mixture screw have done their job and are no longer active, at least until you close the throttle and it all starts again. If the idle mixture jet is correctly sized, then the idle mixture screw should provide a stable idle when it is 2-3 turns from being fully closed (seated on the seat) at an ideal speed of 1000-1200 RPM. Be careful when you screw it fully in, on the seat, so as not to damage anything. If it takes more than 2-3 turns on the idle mixture screw to get the engine to idle, you need to change the idle jet to the next larger size. It probably has a 45 in it now. I would change it to 50, or perhaps even a 55. Then you can back off the idle speed screw and you will then have to reset the idle mixture screw and it should come back to 2-3 turns from fully closed. Dan Georgescu Semiologie Medicala Pdf EnThis should get rid of the stumble at 1500-2000 RPM. High Speed Running – Once the engine is past 2500 RPM it should be running on the main circuit. The makeup of the main circuit metering consists of a Main Jet, Emulsion Tube, and Air Correction Jet. Fuel enters into the emulsion tube, through the Main Jet, from the bottom end; and air enters though the Air Correction Jet at the top of emulsion tube. Semiologie Medicale PdfCursuri SemiologieAfter the fuel/air is mixed (emulsified), it passes through the holes in the side of the Emulsion Tube into the “well area” surrounding the emulsion tube. Fuel from here is supplies to the secondary venturi (choke) and the air rushing through the secondary venturi draws the emulsified air/fuel mixture into the airstream. Accelerator Pump – Just as the cross-over ports helped with the transition from idle, the Accelerator Pump is there to provide a momentary increase in fuel when the throttle is suddenly opened. This shot of fuel keeps the engine from going lean under high load conditions. Rules of Thumb 1) A one step increase/decrease for FUEL JETS is considered to be 5. So going from 120 to 125 would be a one step increase.
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