The Pilot jet only controls the air/fuel mixture at idle and low, off idle, throttle openings. The screw adjustment (explained in the video) is used to fine tune this adjustment at idle speed only. It has very little or no effect on off idle and larger throttle openings.
When the external choke pull-off made its appearance, so did the various external rods and connection parts. There are some pull-offs that use an internal screw or adjuster, located on the port end, usually a small slotted screw, or more commonly a socket head or Allen screw. Adjustment for most external choke breaks involves bending and twisting the connecting rods, and this can be trouble if ...
Two things that control the maximum opening are the vacuum pull-off rod, and the mechanical stop on the air valve haft at the opposite end of the pull rod slot. Bend/adjust the pull rod, and/or file the mechanical stop. My air flow bench showed about a 3% increase in air flow through the carb after this mod.
Replaces Rochester OEM # 7045154, 17056875 Primary or forward choke pull-off. Stock Replacement for Rochester Quadrajet carburetor. Also know as a Vacuum Break. Applications : Chevy Truck 350 1977-...
That lever is a secondary lockout adjustment, pdf page 38, Fig 11. Also, did you make sure all the carb adjustments are correct? As you discovered, the little things can bite you big. BTW, that 5Hg vacuum point is where the power mode kicks in. Holley uses a power valve. Quadrajet, Edlebrock, and Thermoquad use a power piston/spring arrangement.
The first thing I did was to check the choke pull off/AV damper and see how fast it opened. Well as it turned out it opened real close to one second. Great. The air valves already opened fully also. Next I pulled the sec. metering rods and hanger to see what I had. Edelbrock says on their site the 1904 comes with DR rods.
Rochester Quadrajet, 4-barrel Carburetor choke pull-offs. Full coverage of the Rochester carbs through the online catalog. US manufactured and ethanol ready parts.
Mar 19, 2014 · The choke pull-off should open the choke a small amount when the spring is cold. The choke spring is heated by pulling exhaust through it or by an electrical heater in the choke cap. If there is a wire terminal on the choke cap, check for power when it is running.
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Now adj choke pull off by screw or bending the rod depending on year modle carb. Pulling choke open to far will cause lean condition and can pop through the carb and will be hard to drive off. Not pulled open enough will cause rich condition, flooding, loading up, skiping, black smoke. Choke should open around 1/4 inch to get you in the ballpark.
May 13, 2006 · The Quadrajet was ubiquitous on practically every carbureted Chevy engine installed in a car in the '70s and early '80s. Because it is so common, many racetracks allow the carburetor in the stock ...
rochester quadrajet 602a choke pull off diaphragm hj - vb holden v8 . au $55.00. ... holley carburettor 4150 secondary throttle shaft adjusting lever kit 26-137.
A. Connect the choke control cable (Holley® P/N 45-228) to the choke actuation lever, and lock in place with the choke cable lock screw. B. Mount the outer sleeve to the cable clamp. C. Actuate the choke cable through its full range of motion to ensure full choke operation. Adjust as necessary.
Once the car is at normal operating temperature, shut it off and turn the idle mixture screws until they're fully seated by turning them clockwise. DO NOT overtighten them!