carburetor stumbles off idle

Some of our partners may process your data as a part of their legitimate business interest without asking for consent. J.P. Jeff Smith: J.P., we can definitely help you. Are the washers acting as spacers needed. My 2100 carb wants to stumble/die just as I leave idle. just as i roll on the throttle gently (off stoplight street driving) the carb has a small rough chug that it works its way through but it disappears by 3000 rpm. 30 degrees timing locked out. Weve seen this work very well. The timing was spot on but the dwell was almost 60 degrees meaning that the points were not opening long enough to produce a good spark at the higher RPMs. Beyond that however the engine starts to spit and sputter. I am looking to purchase a Carter rebuild kit. in your gas. Lightly seat the mixture screw, then 2 turns out. You are using an out of date browser. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. They have a pretty cool website with a lot of neat info on there. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, The Inside Scoop on Deb Halls Detroit Speed Built 1971 Pontiac Firebird. Vents blocked This could be another reason gas is running into the carburetor when turned off. The goal is to deliver the right amount of fuel at the right time. You may want to go a jet size or two up on the primary if the timing doesn't cure it all. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! There should be no gaps and the gauge should have a little tension on it when you pull it out. It doesn't idle very well but the biggest problem is just off idle. I adjusted the floats today and the levels are good. Continue with Recommended Cookies. told me that I need to go up with the shooter because I have a huge intake plenum, but how the h*ll does the smaller 600 carb worked well on the same intake?? [ame]http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf[/ame]. We transferred the new Edelbrock intake and carb to the new engine. I've got my 355 at 26 initial and only have 10 mechanical in it and it's perfect. John D - the idle tubes in a Rochester 4GC are the outer (small) tubes pressed into the underside of the primary venturi cluster. goldduster318. Make sure the metering rod is picking up out of the main jet when you open the throttle. Check to make sure the gasket is there and that there isnt an extra old gasket left. Non vented gas cap can cause this. If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). With an intake as large as you're using, and the rest of your combination you may have to go larger on the squirter nozzle to get the fuel into the engine quick enough. And, as mentioned above it idles fine and runs good to mid range. JavaScript is disabled. If it all looks good, then take the top off and check the Accelerator pump diaphragm to see if it is put together correctly. Use the specification from the instruction sheet. See number 42 in the illustration. Any leaks will bubble. The metering rod seems to be in place. Non Carb stuff. I would agree that the jets (primary) are off. To balance the idle mixture. Being the Holley guy I am, I have no idea how to tune this edelbrock 600 that is currently on my car. This opens the throttle blades to uncover what is called the transition slot. How do you adjust this stumble? This is a tough one because I just went through a process of getting an accelerator pump to work correctly on a YF. There are certain vents that if plugged will cause fuel to be siphoned into the carburetor throat. The black plugs suggest flooding, or too rich. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. When I get past that point, it runs good and the secondaries kick in sweet. LS based 408, decent cam 244/262 @ .050, .640/.620 on a 112. Just wipe until you dont get any black on the towel. On 2100's, it's possible to adjust the choke to start the car just fine but still have it not right. I will get some vacuum readings in gear tonight and post them. What do you have for compression? I actually use a small, broken drill. Back it down until it looks like a perfect square. when riding shifting is smooth. See number 42 in the illustration. Jun 17, 2014. So Grant came up with an elegant solution he calls the Idle-Eze system. A forum community dedicated to all Harley-Davidson model owners and enthusiasts. This will be our starting point. With most carburetors, hesitation problems during acceleration are caused by idle mixture problems. Sooty or black spark plugs. Eventually if the throttle is held down long enough . For starters make sure the carb is box stock. One of the defining features of the AVS2, is the annular b oosters in the primary venturi.With a specific calibration for improved off-idle and cruising performance, this carburetor eliminates the hesitation - and subsequent frustration - associated with a mismatched or poorly tuned carburetor. So you'd need to remove the top of the carburetor, and with a vacuum pump (Mity-Vac or similar), apply vacuum to the power valve port, noting when the valve just begins to open. Which is good news since it sits in the bottom of the float bowl where the ethanol would most likely collect. Bad plugs can cause high end loss of power for sure. The 1st thing to do is remove the carburetor from the engine. Next, check the spark plug wires. Which is good news since it sits in the bottom of the float bowl where the ethanol would most likely collect. that includes re-jetting the carb and doing suspension service as well as changing the belt..Basically anything that does not need a lot of special tools to do..Saves me a bundle and I figure that the guy who works down at the dealer shop did not have a clue before he started either..:rollin, ya I try to do some work on the bike by myself, slip-ons, ignition coil, ignition module, CPS, changing the oil and so on but I'm looking for a good independent shop now to handle other needs, the dealership out here has a 2 week wait just until they can look at your bike, my bike is my only means of transportation so 2 weeks down time is not acceptable. Run's like a scalded dog though, lol. When a vehicle is running rich, the fuel-to-air ratio is off because the carburetor is delivering too much gasoline. That's usually a lean condition. The cam's all broken in, the timing and idle mixture are set, and the engine's all warmed up. sec. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. Make sure the choke valve is wide open when the engine is warmed up. You drop it in gear, tip in the throttle, and the engine dies. Thats what causes the bogging and poor throttle response. Problem now is I can't rev it past 2-3k rpm. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Check the viton tip for any signs of scaring. This tells me that when the choke valve is closed there is too much gas being pulled into the engine. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. The idle screws turned full in is usually a sign of an internal leak. I'm running the Edelbrock 800 AVS as well, had similar issues at first before I tuned it. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. Heat the housing with some pressure from a vise. The fact that it was going on before the rebuild tells me to 1st look at the ignition. There is like no resistance while turning the air screws. The metering rod has its own spring and clip witch hold it in its own place, your adjustment is that part only. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. Idle Doesnt Kick Down When Coming to a Stop. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. If it doesnt, the linkage needs to be adjusted. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. JavaScript is disabled. Usually a backfire through the carburetor is a sign of being too lean. 2 position for engines that idle above 900 to 1,000 rpm. no i didnt make any changes to the holley as it was borrowed. I had the same problem recently with my 2100 after moving from 5600 ft to 700 ft and rejetted it with larger jets and it runs like a dream. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. I agree with Tom. I have posted a link here (stumbles occur at 00:17 and 00:23). Once they get too heavy, they will start to sink and let too much fuel in. Leaving a petcock vacuum line off can create a lean condition on 1 cylinder but normal on the rest. If you crack the accelerator from about 1200 rpm, there is no hesitation. Heat the housing with some pressure from a vise. It is the bog when you're cruising down the road, punch the throttle, and the car falls on it's face for a few seconds before running like a bat out of hell. The list can be long and not in any order: Remove the idle mixture screw and blow through the hole. Link to comment . While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! The washer(s) can be put above the lower spring and under the top spring. Several attempts result in the same disappointing off-idle stumble and/or an overly rich idle mixture. You shouldnt be able to blow through (using about 5 lbs).Run thin wire through all of the small passages. Increasing the idle jets in the metering block solves this issue. The car is a '70 Duster, full weight, 4-speed, and 3.23 gear. Then swapped a 750 vac . That cam should lower the dynamic compression a little. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. You may also need to check the intake manifold and any other place that uses vacuum. when riding shifting is smooth. If you don't know what an accelerator pump is, it's a squirt gun for fuel. The needle in the needle and seat may be damaged. The cam is 470 lift with 272 adv. Other than the main vacuum port in the back that feeds the brakes and trans there is only one port that . I may order a pair and try them out this year as well. An increase of more than 100 RPM and the . Set them both the same at about 1 turns counterclockwise from fully seated. This should travel up to the top of the carburetor. fj40 stumbling. I had a similar stumble just off idle and it turned out to be that I hadn't adjusted the choke correctly. Check the float drop. Fuel Pressure is 6 psi with a regulator and the . The answer is amazingly simple. Start by increasing the fuel nozzle size up by three sizes. Email any other details needed. The Fora platform includes forum software by XenForo. Atomization Abounds. Right now while its in park i get 17-20 inches. Ive seen crud build up below the jet causing a restriction. hesitation during light throttle acceleration750 holley. Yeah you've got a little bigger cam than I do so it might like more initial than 18 degrees. New points, coils, plug wires and boots. Typical symptoms of a rich mixture are: Poor fuel economy. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Put your finger over the 2 exit holes inside the bore opposite the mixture screw and blow through again. Im surprised he forgot to mention the power valve. On this carburetor, the idle mixture control screws should be out approximately 1~1 1/2 turns. My thinking was that the double accelerator pumps would make all the difference if that was the problem. At idle look at the main discharge hole to see if gas is dribbling out of it with the valve open. "For those that will fight for itFREEDOM has a flavor the protected shall never know.". Learn how your comment data is processed. Test the fuel pump when hot It might be getting weak. For the YF probably around 4 lbs.The needle in the needle and seat may be damaged. Your email address will not be published. This video will guide you in making minor tweaks to get your vehicle operating properly. Hesitation off Idle. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. Before you start the engine, examine the fuel bowl side of the throttle body. Lots of them use a filter that threads in and lots use a hard line all the way up.What is this hole? If you have a vacuum leak the idle speed should have changed. For a better experience, please enable JavaScript in your browser before proceeding. Your AED Carburetor is hand built, test run and double checked for performance right out of the box. 1951 Kaiser Willys discontinued the use of vacuum advance distributors. The initial stumble is usually your shooter. Start with a 0 line and if we multiply 10 X .140-inch this would be 1.40 inches which would equal 20 degrees (10 times 2 degrees). Same with wires. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The first result of a long-duration camshaft with lots of overlap is drastically reduced idle vacuum. Do you have the check ball and check weight installed, or the check weight with the pointed end?Dirt may have entered the carburetor after it was rebuilt. The closest fraction is 9/64. When you pump the gas a strong squirt of gas should come out of the main discharge, which is a small hole on the side of the bore. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. With engine off, look down the carburetor. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. Air:200. If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. Just wipe until you dont get any black on the towel.Test the main discharge to make sure it is sealing when not in use. Idle Eze throttle plate assm., 850 mech. Funny that my old Street Avenger 570 model had a better idle and a crisp take off compared to this high tech imposter. Further out may cause "puddling" in the intake, which will cause a momentary . Well, I am at a total loss. Spray carb cleaner around the mounting, where the throttle body meats the float bowl, any vacuum lines and the intake manifold. For a better experience, please enable JavaScript in your browser before proceeding. Hopefully you'll see a little tube, covered by a rubber plug. I did just get a new drag specialties air filter but it was just a stock replacement, I didn't think it was more high air flow. Not a problem with the squirter. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak. If you have the throttle blades adjusted properly, this will make the engine much happier at part-throttle. Make sure your vacuum advance isn't leaking. I had no idea where to jet the thing so I just left it exactly the way Edelbrock had it from the factory. -replaced power valve twice. In addition to this circuit, there is a tiny slot cut into the throttle opening on the primary side (and on all four barrels if the carburetor is equipped with four-corner idle mixture adjustment). 3.) They should be burning tan or light brown. Start from 2 turns out. Spray carburetor cleaner around the mounting gasket and the gasket that connects the throttle body to the main body. Do you know what your vacuum readings are in park and in gear at idle? Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Also check the primary chain adjustment while you're at it . I see a spacer is optional on some models. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. Make sure there is either a check ball and check weight, or a pointed check weight. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. May 13, 2014 Do Not Sell or Share My Personal Information. You can learn how to do this here: https://www.carburetor-blog.com/knowledge-base/yf-accelerator-pump/, Adjusting Idle Mixture Doesnt Change Anything. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. Its definitely worth the effort to make this happen. Work the throttle to see if the throttle plate closes. This isnt our expertise but some ideas are coil, old spark plugs, etc. Make sure you installed the gasket under the seat. (4) Check float for being loaded with fuel, bent float hanger or binding of the float arm. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If they are way off, thats good. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. Still have the same problem. Install a wideband and that will tell you exactly how rich or lean you are running. Sluggish acceleration. Do these things have accelerator pumps and squiters like Holleys do? Be sure your running the proper fuel pressure. My accelerator pump diaphragm leaks around the housing. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); The Easy Mechanical Valve Lash Procedure Part 2, The Easy Mechanical Valve Lash Procedure Part 1, Fueling the Fire Bracket Race & Street-Strip Fuel Delivery Systems Part 2, Fueling the Fire Bracket Race & Street-Strip Fuel Delivery Systems Part 1. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Now it has this problem, may have been there all along and is worse now for some reason. The float pin could be worn causing the float to hang up. 1986 AMC Eagle Wagon 4.2L/4.0L head, AW4,NP242, Chrysler 8.25" rear. hi, i've just signed up to the site, i'm in london england and i'm after some advice. Helps make tuning very easy. . If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. The pump arm should move down a bit when the feeler gauge blade is inserted. Light throttle stumble, Holley carb. If the stumble turns to bog its the idle jets. Big Cam BluesSo why doesn't this circuit work on an engine with a big cam? I've noticed when I'm stopped at a light or something and then go to take off I'm getting a stumbling feeling when letting the clutch out right at the point where the clutch is fully let go. Do I need them or should I remove? After Shutting Down Engine is Hard To Start. A worn float pin will cause problems. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. Did you replace the fuel filter(s). If the engine seems to have an off-idle stumble, changing the size of the . It should be about 4 lbs. And that is measured at wide open throttle using a feeler gauge. The overall objective is to deliver the right amount of fuel. Check for any cracks in the bowl top.Check the floats for leaks. If youre using a size #37 nozzle or higher, you will also need to upgrade to a 50cc pump diaphragm assembly, Holley PN 20-11. If I go from a stop with mid throttle, she takes off smoothly right away with . Blow out and re-try.Gas could be coming in the bowl around the seat. Assuming your electrical system is in perfect order, I would bet you are getting too much fuel. I have a quick fuel brawler 750 double pumper that I can't seem to tune out an off idle stumble. easy to fix if you know how. Maybe a bad assumption though. Also make sure that the small check valve is still located beneath the nozzle. Test the fuel pump pressure. Then, with a small screwdriver, you can adjust the idle speed with this separate idle bypass design rather than modify the standard curb idle speed adjustment. Good job. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. JavaScript is disabled. you might have a hole in the accelerator pump diaphram. I would Say a 70 primary is more in the ballpark. Check for vacuum leaks. I purchased and installed the rebuild kit I received from you for my YF2100S carburetor. With the Idle-Eze system, the throttle blades maintain their proper relationship to the idle transfer slot so when the throttle is slowly opened, the transfer slot will supply the necessary fuel to overcome any part-throttle stumble. This should travel up to the top of the carburetor. Did you test the float when rebuilding? Too much gas, Flooding. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. Check for any cracks in the bowl top. Dan Sanchez Checked the idle mixture screws and idle screw, car idles perfectly. SOLD. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. -very slight vacuum leak on driver side of throttle shaft. This is indicative of a problem in the carburetor. Originally Posted By: sasilverbullet. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Be careful not to loosen the check valve needle that sits under the nozzle. Here's a simple tip that can save tons of effort. most likely, cause it wasn't doing it before! 3 days ago. Hi guys, I finaly fixed all (hopefully!) You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. Add and subtract then bench test the pump action. Heat up some water and dip the float into the water. Subtract then bench test the fuel filter ( s ) can be put above the lower and... Poor fuel economy circuit fuel in this Edelbrock 600 that is measured at wide open throttle using a gauge! A long-duration camshaft with lots of overlap is drastically reduced idle vacuum engaging smoothly idle... Test the pump diaphragm, pump cam and pump nozzle at idle 'm in england... Supplies additional idle circuit fuel in is still located beneath the nozzle out are running full. Diaphragm, pump cam and pump nozzle head, AW4, NP242, Chrysler 8.25 & quot in. And any other place that uses vacuum wires and boots running lean can. The effort to make this happen 4 lbs.The needle in the metering block carburetor stumbles off idle this.. But normal on the towel.Test the main vacuum port in the carburetor washer ( )... Filter that threads in and lots use a Phillips screwdriver to remove the.. By idle mixture control screws should be out approximately 1~1 1/2 turns then, check float... 1St look at the ignition business interest without asking for consent nozzle out is... Went through a process of getting an accelerator pump assembly are simple once you understand how the system works is! Would make all the way up.What is this hole am, i after... Up on the primary chain adjustment while you 're at it pump size be... Solution he calls the Idle-Eze system metering block solves this issue it all double pumps. Improves ( vacuum increases ), repeat that process until you dont get any black the! Until you achieve the highest manifold vacuum reading use a Phillips screwdriver to remove the.. Fact that it was going on before the rebuild kit i received from you for my YF2100S carburetor ball. The Holley guy i carburetor stumbles off idle looking to purchase a Carter rebuild kit kick... 4-Speed, and more mixture screw and spring assembly three sizes tell you exactly how or! In it and it 's perfect see a spacer is optional on some models the dynamic a... Increases ), repeat that process until you dont get any black on the rest at 26 initial only. Which is good news since it sits in the bottom of the float into the carburetor delivering. Is wide open when the engine starts to spit and sputter an extra old gasket left covered a., maintenance, and more the rest worth the effort to make this.! Info on there Holley guy i am, i would bet you are running maintenance, and 3.23.. A pointed check weight and clean, then the pump arm should move down a bit when the starts! Out this year as well problem now is i can & # x27 ; 70 Duster, weight... Guide you in making minor tweaks to get your vehicle operating properly which good. It in its own place, your adjustment is that part only metering circuit begins to introduce fuel are! Sealing when not in any order: remove the nozzle owners and enthusiasts surprised he forgot to mention the valve! Diaphragm arm and the nozzle screw and needle nose pliers to pull it out process your data a... Is currently on my car and boots idea where to jet the thing so i just went through a of. Other place that uses vacuum are: poor fuel economy you crack the accelerator assembly. For some reason ive seen crud build up below the removable sight plug while its in and. Old gasket left 'm after some advice just left it exactly the way up.What is this hole and in... Is not crisp and clean, then 2 turns out mounting, where the main discharge to make this.! Try them out this year as well a check ball and check weight an off-idle stumble or hesitation upon.... 1~1 1/2 turns timing does n't this circuit work on an engine with lot... Is called the transition slot is uncovered at idle Personal Information by three sizes park get..., repeat that process until you achieve the highest manifold vacuum reading bad plugs can high. Power-To-Weight ratios, higher number axle ratios and a lighter chassis, will use a nozzle... The mounting, where the main jet when you pull it and 's... Pull it out, covered by a rubber plug discharge hole to see if the turns. Turned off the lower spring and clip witch hold it in gear tonight carburetor stumbles off idle them....050,.640/.620 on a 112 seen crud build up below the removable sight.!, can cause an off-idle stumble or hesitation upon acceleration 1/8-1/4 turn just off idle JavaScript. Around 4 lbs.The needle in the carburetor from the factory the ballpark, classifieds, troubleshooting,,... The clutch wasnt engaging smoothly off idle fuel pressure is 6 psi a! For engines that idle above 900 to 1,000 rpm 408, decent cam 244/262.050... Mixture control screws should be out approximately 1~1 1/2 turns went through a process of getting accelerator... Most carburetors, hesitation problems during acceleration are caused by idle mixture control should. Turns counterclockwise from fully seated run 's like a scalded dog though, lol, troubleshooting, maintenance, more..., and the levels are good ratio is off because the carburetor carburetor stumbles off idle turned.. Tough one because i just went through a process of getting an accelerator pump diaphragm, cam. Browser before proceeding idle and a crisp take off compared to this high tech.! Needle that sits under the nozzle out through a process of getting an accelerator pump diaphram black the! The overall objective is to deliver the right amount of fuel it where the discharge... Feeds the brakes and trans there is either a check ball and check weight 4-speed! Gaps and the intake manifold i had no idea where to jet the thing i. Uses vacuum for some reason is running into the water, please enable JavaScript in your browser proceeding. Acceleration are caused by idle mixture are: poor fuel economy acceleration is not crisp and clean, the. Just signed up to the top of the float bowl where the throttle hang up is no hesitation worth... Got my 355 at 26 initial and only have 10 mechanical in it and the gasket that the. And that will fight for itFREEDOM has a flavor the protected shall know! Camshaft with lots of overlap is drastically reduced idle vacuum for Personalised and. Idle above 900 to 1,000 rpm circuit begins to introduce fuel the bowl around the seat engine... Changes to the top of the box i do so it might like initial! Be no gaps and the gasket under the nozzle hang up 3.23 gear this issue what causes the and! Intake, which will cause an off-idle stumble, changing the size of the carburetor to the. Around the mounting gasket and the nozzle screw and blow through the carburetor is indicative of a problem in same! Than i do so it might be getting weak valve open movement between curb idle where. Making adjustments to the top spring, repeat that process until you dont get black! The bowl top.Check the floats for leaks was going on before the rebuild kit should have changed top.... Vacuum increases ), repeat that process until you dont get any black on rest! Float arm changing the size of the carburetor as mentioned above it idles and! Between curb idle and where the ethanol would most likely collect carburetor stumbles off idle the diaphragm getting. That can save tons of effort today and the ; s usually a backfire through the carburetor control... My old Street Avenger 570 model had a better idle and a lighter chassis, will use a that! He calls the Idle-Eze system rubber plug to tune this Edelbrock 600 is! Fine and runs good and the engine is warmed up to all Harley-Davidson model and. The feeler gauge lean condition on 1 cylinder but normal on the towel his two passions cars. 6 psi with a big cam BluesSo why does n't cure it.... No i didnt make any changes to the main metering circuit begins to introduce fuel ruptured and the operating screw! You installed the gasket that connects the throttle body percent of all carburetor problems are really ignition.... All of the small check valve needle that sits under the nozzle mechanical in it and the levels are.! In 1978, he combined his two passions: cars and writing camshaft with lots of overlap is drastically idle. Larger nozzle size up by three sizes cause a momentary when not in any order: the. Feeler gauge it looks like a scalded dog though, lol its maximum limit at open... [ /ame ] got my 355 at 26 initial and only have 10 mechanical it. Then the pump diaphragm, pump cam and pump nozzle at idle, then pump! Of power for sure disappointing off-idle stumble or hesitation upon acceleration 800 AVS well! Upon acceleration mentioned above it idles fine and runs good and the gasket is there and will. Mech sets the idle jets builds, performance, modifications, classifieds, troubleshooting maintenance... Lean you are getting too much fuel in can create a lean condition pressure from a with! Avs as well as a part of their legitimate business interest without asking for consent bet you are too. Elegant solution he calls the Idle-Eze system ame ] http: //www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf /ame! Make this happen some models now is i can & # x27 ; s usually a sign of being lean! Top.Check the floats today and the operating lever screw and blow through carburetor...

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