How do I adjust my Zenith carburetor?
Turn idle adjusting needle in lightly against its seat, then back out needle l 1/2 turns as a preliminary adjustment. Set main jet adjusting needle at 4 1/2 full turns open. Start engine and let it run a few minutes until warm enough for final adjustments. Set the throttle stop screw for the desired idling speed.
What is fast idle stop screw on Stromberg 175?
Fast-idle stop screw 12. Throttle stop screw The throttle spindle is provided with seals to reduce wear on the spindle and bushes and also eliminate air leakage, On B 20 B engines with twin Strornberg carburettors, these differ structurally from the carburettor for the B 20 A engine as follows: (see Figs. 66, 67, 68 and 69).
What kind of carburettor does the Stromberg 175 have?
Fuel System Description Stromberg 175 CD-2 SE And SU-HS 6 Carburettors FUEL SYSTEM DESCRIPTION The B 20 A engine is fitted with a horizontal carburettor of typo Stromberg 175 CD-2 SE, see Fig. 60. The B 20 B engine In the l20 and 140 models is fitted with two horizontal carburettors of type SU-HS 6. see Fig. 61.
How do you change the piston on a Stromberg carburettor?
Check that the choke is fully shut and that the fast-idle stop screw is clear of the choke linkage . Hook your finger under the edge of the dashpot and press the lifting pin upwards to raise the piston by about 1/32 in. (1 mm). If there is no pin, lift the piston with a screwdriver.
Is there a separate idling circuit in the Stromberg?
There is no separate idling circuit in the Stromberg .. CD” carburettor, and the fuel is provided by the jet orifice 19, the amount being controlled by the setting of the orifice adjusting screw 13 and the speed of idle by adjustment to the throttle stop screw 3 which limits the closure of the throttle when the foot is off the accelerator pedal.
Fast-idle stop screw 12. Throttle stop screw The throttle spindle is provided with seals to reduce wear on the spindle and bushes and also eliminate air leakage, On B 20 B engines with twin Strornberg carburettors, these differ structurally from the carburettor for the B 20 A engine as follows: (see Figs. 66, 67, 68 and 69).
Why does the Stromberg 175 CD2 carburetor work?
The do work if they are in proper working order, making the mixture leaner above their operating temperature which is about 120 F which is when they first open and progressively weaker at hight temperatures. That does make sense since a hot engine should need a leaner mixture.
What’s the correct way to adjust a Stromberg carburettor?
Screw the jet upwards (that is, anti clockwise looking down on the carburettor) to weaken the mixture, or down (clockwise) to make it richer. With the mixture setting correct, the idling speed may now be too fast or slow.
How does idle mixture work on a Stromberg?
Stromberg carburetors do NOT have an accelerator pump circuit so how do they prevent that 600 to 1200 RPM hesitation and stumble from occurring when power is advanced??? Look inside the Stromberg venturi bore where the throttle plate is located. You will see a little idle mixture bleed hole at the butterfly plate’s edge.