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To eliminate the likelihood of any fuel/air from the secondary throttle plates, I'd do the block-off gasket trick! You can then use a screwdriver to adjust both screws ¼ turn at a time until your engine purrs smoothly. Use the throttle to slightly increase and decrease the RPM. The manual for the AT1 says start the idle mixture screw at 1-1/2 turns counterclockwise from fully screwed in (lightly seated; don’t screw it tight), then adjust either way in 1/2 turn increments to find the fastest, smoothest idle. At that point it goes past the Idle Air Bleed that mixes the liquid fuel with a little air from the main bore area turning it into a frothy mixture that I call "cappuccino foam". Then poke a tiny hole in the straw (much smaller than the opening of the straw) above the level of the liquid. See if you see fuel dripping in from somewhere.It's getting fuel to mix with the air somehow,and if you closed the idle circuit mixture screws,it's not likely coming from there. Once warmed, slow the idle to the lowest possible speed. Using the throttle, keep the engine at a low RPM, just above stall RPM. The slow jet is interchangeable with jets that will provide a leaner or richer air-fuel mixture. UtopiaTexas. The confusion is simply because most 4t and 2t control the fuel/air mixture by that screw but in different ways. It is a 1986 merc. but i have no clue where stock position is. Gently turn the screw all the way in. The plate should be open just a small amount with the throttle off. Anything that upsets the the normal flow of air or fuel can render the adjustment useless. Every jet is identified by a number and that number relates directly to the size of the opening inside the jet. It's look like the air/fuel mixture on my DR need a bit adjustment but the screw is a bit hard to reach. Using my misguided approach, I ended up running from one side of the car to the other like a madman, losing track of how much I had turned the previous mixture screw and in which direction. *The idle mixture screws have no effect on the fuel through the booster venturi rings. I thought, perhaps the power valve was blown and it's getting extra fuel that way. Turning the screw IN makes the fuel/air mixture leaner. Engine runs great, starts fine, idles fine. Or if you have low idle vacuum, it could cause the PV to open slightly - making it run rich and impossible to shutdown but screwing the idle mixture all the way in. To adjust your idle speed, find the idle mixture screw that limits the flow of fuel at idle. Remove air cleaner and observe in the venturi as you twist the throttle. Idle mixture screws on the Quadrajet must be adjusted equally in order to have a balanced air/fuel mixture. On two stroke carburetors this is an air screw so don’t forget turning the screw out is a leaner mixture. Actually, when the engine is at normal idle speed (600 rpm) the idle mixture screws control the air and fuel in the front of the carburetor *just below the throttle plates inside the two throttle bores. Pilot or air/ fuel mixture Screw question . The ideal air/fuel ratio is 14.7 grams of air to 1 gram of fuel. One adjusts the slide height and is called the idle speed screw, while the other adjusts the air-to-fuel ratio and is called the idle mixture screw. I have rebuilt the fuel pump on my Metropolitan and taken the Zenith carburetor apart to clean all the gunk out of the bowl, blow out the jets out of the carburetor and blow air through the passages to make sure they are clear. Post Reply : Page 1 2 > Author: Message Topic Search Topic ... ,but concentrate on the primary. If I dump a little gas down the carb a couple times, I can finally get it to go. Most four-barrel carburetors use two screws to set the idle mixture. And, the Main jet sets mixture for WOT position. Only cold starts the thing is a pain in the butt. This ideal ratio is only achieved for a very short period while the engine is running. ive read it needs to be 2.5 turns out from stock (i think). I am totally confused...any help. When it is warm and shut off, it will start right back up. The reason for this is that a foamy mixture atomizes much better in the intake manifold than liquid fuel does. Mixture screws all way in increases vac. When I took it apart the bottom adjustable screw on the carb was all the way in seated tight. [color]#000088 wrote: Possibly the wrong needles! 365 215 2. Now the right (driver's side) one works, but the not the left. Could be mis-adjusted throttle cable [too tight] or a physical problem with the carb. by davis911s » Thu Aug 08, 2019 3:28 am . Turning an air screw in restricts the air flow and richens the mixture (turning it out leans the mixture by letting more air in). There is small screw at the bottom of the carb facing up. my mods are in my sig. Just to confirm: I get no reaction to idle mixture screws being screwed all that way in (weak mixture). Post Jan 12, 2019 #1 2019-01-12T16:36. (adjust screws so you get the highest gauge reading.) What's up with that? The correct needles should block when screwed fully IN! Normally it's suppose to be easy to reach, somewhere on the side of the carburator, but on my DR650 2003, the screw is located under the carburator and there's a plug over it to protect it. Rich C. 348AMX . Discussion Starter • #1 • Nov 25, 2008. Is that screw air mixture or fuel mixture screw? Is it the "Pilot Screw" I have to play with? 69 Camaro -originally a LM1 car. 18 Posts . Last time I had this the throttle plates were too far open causing the transition fuel … Turning the screw OUT makes the fuel/air mixture richer. 2t it is most commonly an air screw, so turning it in is tighter/closed thus letting less air in. Initially adjust the low speed mixture screw to approx 3 turns out from all the way in. If yes how can I reach that fucking screw. 365 215 2. Zenith Carburetor- Any Way To Enrichen The Fuel/Air Mixture? Send Private Message. Then adjust your mixture screws, using a vacuum gauge. Same thing when got it back on. 5.0L I can seat them all the way in or completely remover them, and there will be no effect on the motor's rpm's. Start the bike and fully warm it up, go for a 10 minute ride. Once RPM increases above idle, the idle mixture screws are no longer in play. He just went through it and didn't find anything wrong. This creates a richer air/fuel ration. An air screw meters air before it reaches the pilot jet. It almost sounds as if only half of the cylinders are running. My friend has a 4160 carb that has never run right. The idle mixture screws sets the mixture of fuel and air during idle RPM; the idle circuit is in effect only when idling. Butt Dyno says it runs great, takes the throttle and cruises just fine. No. However, I was just a bit concerned that while I was trying to fine tune, the engine continued to run with the screw all the way in. Now back it out two turns. UtopiaTexas. The most common cause of rough idle quality in engines equipped with this carburetor is an unevenly adjusted idle mixture circuit caused by incorrectly adjusted mixture screws. Turning the pilot air screw in will richen the air/fuel mixture while turning the screw out will lean out the mix. Does turning it in (clockwise) make it run leaner or richer? Single barrel carburetors will have one idle mixture screw while 2 barrel and 4 barrel carbs usually have 2 idle mixture screws. Failing all those things, it could be a leaking power valve. It was perfectly clean, still pulled all jets and screws out cleaned With air gun. For example: suck any liquid through a straw. The fuel is emulsified with the air bleeds so it flows through the internal passages easier. The amount of air is held constant by the throttle position so the AIR FUEL MIXTURE delivered to the engine is controlled by those screws. and sometimes when i turn the truck off it still stalls and backfires. It was, and I replaced it with a new one. Re: holley idle mixture screws i fired car up today and let it warm up to 180 degrees, then tried setting idle mixture screws, i can screw both primary screws all the way in and it will keep running, with hardly any idle change, it is very rich and gassy at idle, am i doing something wrong or have some mismatched engine parts? Conversely, a fuel mixture screw meters gas after it has been mixed with air, thus it works the opposite of an air screw. I can seat them all the way in or completely remover them, and there will be no effect on the motor's rpm's. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1 I air fuel mixture is wrong and i need to adjust it but worried about messing it up more. Set the idle to speed to 1,500~1,800 RPM as best you can (I know, without a tach this is tough, just set it to were it idles relatively smoothly). The screws on your carbs meter air from the air jet to be mixed with the fuel from the Slow jet, primarily for throttle settings of idle to 1/8 open. alright i was wondering where my air/fuel mixture screw should be at. For example, 0.01 percent CO is equivalent to 14.7:1 air/fuel and 0.38 percent is equivalent to a 13:1 air/fuel ratio. Lean means less gas, rich means more gas. The idle mixture screw is intended to provide a fine adjustment to the fuel/air mixture at idle for a smooth idle. When it's at running temperature, find the 2 screws on your carburetor that adjust the air and fuel mixture. The air/fuel mixture must be changes to meet the demands of the needs of the engine. The idle is very rough and doesn't rev very well, or loud for that matter. So if i just wanted to lean it out a little which way do i need to turn the mixture screw. Members Profile. Other posts/blogs/websites suggest that the engine should die after a few seconds due to fuel starvation. https://www.thejunkmanadv.com/how-to-idle-mixture-screw-adjustment.html If it idles with the mixture screw all the way in then the throttle plate might not be closing. (adjust screws so you get the highest gauge reading.) and idle? Pilot or air/ fuel mixture Screw question davis911s Posts: 5 Joined: Mon Jul 01, 2019 11:51 pm. The mixture screw is backed out by about 1.5 turns and the scoot is running very well. my truck stalls when i punch it and occasional backfires, and has alot of black smoke when i gun it. The fuel/air mixture screws do nothing. The Carb slide and attached jet needle set the mixture for 1/8 to 3/4 throttle positions. The idle screws on a Rochester Quadrajet carburetor fine tune the air-fuel ratio going into the engine during idle. I was on the right path but putting the cart in front of the horse. Again smaller is leaner, larger is richer. Any input would be great. QUESTION NINE: ARE THEY ADJUSTED THE SAME WAY? I can screw the idle mix screws in all the way, but it still is too rich and the motor won't die. But they're all … Before, both idle mixture screws did nothing when turned all the way in or out. ive tried to search but no answer. The atomized air/fuel mixture then passes into the throat of the carburetor. I bought new seals for my sons 2012 CRF150F and cleaned the carb and jets. 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