carburetor stumbles off idle

Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. This should travel up to the top of the carburetor. Primary jet 72, Secondary jet (plate) 75*, Power Valve 6.5, Accelerator pump 31. All '76 models use a size #115. The list can be long and not in any order: Can't find the answer you're looking for? Sluggish acceleration. Robert recommends a replacement jet - size #98. Fuel Pressure is 6 psi with a regulator and the . So what's the fix? Ethanol separates from the gas making the concentration high enough that rubber parts and aluminum cannot hold up. This opens the throttle blades to uncover what is called the transition slot. Hope this makes sense. 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. You drop it in gear, tip in the throttle, and the engine dies. Make sure that it is clean and clear. Heat up some water just prior to boiling, immerse the float, any bubble indicates a leak.Leaking around the seat. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. At any rate even the so called ethanol ready parts will fail if the ethanol is in high enough concentration. But by doing so, you're now using fuel supplied by the transition slot. Idle-Eze throttle plate assm., 650/750-cfm, vac. The float pin could be worn. By chance if this carburetor was transplanted before this all started then the problem may be the carburetor main jet is too big. #1 thing to look at is the ignition. 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. Choke not needed from cold starts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Make sure you have a good in line filter.What is Flooding and How Do I Fix It? Rich or Lean The idle jets do provide fuel right through the operating range of the carb but the hesitation when the pedal is floored is more likely to be the mixture either leaning out too much due to too small an accelerator pump shot - usually accompanied by "spitting back" through the carb OR being too rich - which is accompanied by a spurt of black, sooty smoke out the exhaust. -very slight vacuum leak on driver side of throttle shaft. The Honda part number for this replacement jet is 99164-601-0980. odd that she just got serviced and they supposedly adjusted the clutch then. There is a fuel Economy one and a regular one. That would indicate gas is getting siphoned from the main discharge maybe due to the check ball not seating, or check weight above the check ball missing. The suction you cause will sometimes unclog a passage. Thanks. no i didnt make any changes to the holley as it was borrowed. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. I would Say a 70 primary is more in the ballpark. Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. I adjusted the floats today and the levels are good. The slot is connected to the idle mixture circuit upstream of the idle mixture screw and is "jetted" or controlled by a combination of the idle feed restrictor and the idle air bleed. fj40 stumbling. The off idle is not even close to the Holley. Bad plugs can cause high end loss of power for sure. Use the specification from the instruction sheet. Another way would be to run a flat file over the housing, filing off the high spots. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips Thats what causes the bogging and poor throttle response. Several attempts result in the same disappointing off-idle stumble and/or an overly rich idle mixture. 2 position for engines that idle above 900 to 1,000 rpm. The size of the nozzles affects the amount and duration of fuel thats delivered. duration. Disconnect the link that connects the throttle shaft to the accelerator diaphragm arm. Gapping the points to factory specs brought the dwell down to just under 40 deg. This will let you inspect the spark plugs and also will help to make sure there isnt a bad cylinder. Bike stumbles at idle to 1/4 throttle. If the engine seems to have an off-idle stumble, changing the size of the . Heat up some water and dip the float into the water. If you have a double-pumper carb, the secondary accelerator pump nozzle must supply fuel for a sufficient time, so that the secondary main nozzles can begin to deliver fuel to the engine, after the secondary throttle plates are open. Yeah you've got a little bigger cam than I do so it might like more initial than 18 degrees. Any leaks will bubble.Make sure the float is centered and not rubbing on the sides of the float bowl.Move the float up & down by hand to see if it catches anywhere.Check the float level to make sure it is correct.Spray carburetor cleaner through all of the small passages. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. After Shutting Down Engine is Hard To Start. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. There is like no resistance while turning the air screws. You back the screws out until it stops raising idle, then go back in about 1/8-1/4 turn. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel . A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. They also left out the transition circuit. Check the throttle valve now. Warning new fuel pumps often have too much pressure. This can happen when putting pressure on it when adjusting the float. if this just started , I would check out the accelerator pump. Before you start the engine, examine the fuel bowl side of the throttle body. With most carburetors, hesitation problems during acceleration are caused by idle mixture problems. Make sure you have a good in line filter. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. It may have been changed to a larger one, which is often the wrong move. This particular fix (o. 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. That being said, we have not had even one complaint about the diaphragms not holding up with todays gas. 1 position for idle speeds below 900 rpm and suggests moving to the No. 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. -manifold distributor advance set at 8 degrees BTDC. The consent submitted will only be used for data processing originating from this website. Ask me how I know. I understand that I can unsubscribe at any time. , I feel I'm lost with sooooo many variables to think about! What do you have for compression? Your email address will not be published. . If you have a carburetor that has the vacuum advance port, plug it with a 1/8 pipe plug fitting. I have 15 deg of mech advance for a total of 35 deg - all in by 2800 rpm. -replaced accelerator pump twice. This can be fixed by doing a rough adjustment. One of the air tubes may be plugged causing a rich condition.Move the float up and down to see if you can feel any resistance. yup clutch adjustment fixed her right up! Still have the same problem. Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. If you have the MoCo svc. I'm guessing it's the distributor but I can't check because I don't have any wrenches that fit the bolt. It doesn't idle very well but the biggest problem is just off idle. Your accelerator pump isn't working. I had a similar problem with my 383 with Holley carb. You can usually tell this by driving for awhile, then remove the gas cap. Not sure , but tried several times to set the 4 corner screws with very little positive results. The air screws seem to be a little loose fitting in the holes. Float level off, or perhaps leaking. I checked the codes and nothing came up. Spray carburetor cleaner into the throat of the carburetor. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. When I get past that point, it runs good and the secondaries kick in sweet. Regardless of how you approach the repair of this problem, the key is the proper relationship of the throttle blades to the idle transition slot. It should be about 4 lbs. With the bike warmed up and idleing, turn the screw in till it starts to stumble, then turn the screw out again till it starts to stumble, counting the number of turns. Sometimes wiping the needle viton tip with mineral spirits will help. JavaScript is disabled. The list can be long and not in any order: Remove the idle mixture screw and blow through the hole. Luckily a simple few turns should fix the problem. Short summary: Stumble off idle under hard acceleration. Ive seen crud build up below the jet causing a restriction. Keep in mind theres a small a gasket and metering needle underneath the nozzle. Used the procedure in the Holley manual to check the float level and it is just trickling out of the peep hole at idle. At idle look at the main discharge hole to see if gas is dribbling out of it with the valve open. 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. Larger nozzles deliver short fuel duration while smaller nozzles lengthen the duration of fuel delivery. For the YF probably around 4 lbs. Check the float drop. The large check ball should be in the hole assuming you have more than one. (Jets,Rods,Springs). Make sure you installed the gasket under the seat. Float level was close, but float drop was way off. Once they get too heavy, they will start to sink and let too much fuel in. The needle in the needle and seat may be damaged. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Well, forget that silly notion, the jets have nothing to do with it. Work the throttle to see if the throttle plate closes. Check for any cracks, or perhaps the old gasket is still underneath. This means that the carburetor is flooding and when this happens the gas runs down the carburetor and out the 1st place it can, which is the throttle shaft. Maybe a bad assumption though. The answer is amazingly simple. Remember the drop can be anything as long as it lets the needle drop down, but not so far that the needle gets cocked to one side, or falls out. If it is, it can cause all sorts of problems. 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. I got a service manual and am learning to do most of my work myself. The 1st thing to do is remove the carburetor from the engine. That's usually a lean condition. Start by increasing the fuel nozzle size up by three sizes. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Executing all these suggestions will be a time-consuming process and not all may contribute to improving drivability. If you crack the accelerator from about 1200 rpm, there is no hesitation. -idle mixture screws set to the rich side at 2-1/2 turns out. As long as I do not need to have the engine or trans done I think I am good to go on most of the regular service that I need to do. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. The carburetor is a Holley 750 with vacuum secondary. Most noticeable in the street avenger series. Jun 17, 2014. Apr 28, 2011. If excessive dirt is found, remove the carburetor unit. The float pin could be worn causing the float to hang up. 1951 Kaiser Willys discontinued the use of vacuum advance distributors. Fuel is dribbling out of the main discharge at idle. Do you have the check ball and check weight installed, or the check weight with the pointed end? manual go thru the clutch pack adjustment procedure . Continue with Recommended Cookies. Manage Settings JavaScript is disabled. Move the float up and down to see if you can feel any resistance. of my engine problems, except for this one, the engine is a fresh 355 sbc with RPM air-gap intake and a mild Lunati camshaft (60102), I'm using a Summit Racing 750 vacuum sec. With the exception of a vacuum leak, the idle is affected by the throttle valve being open. sec. The cam's all broken in, the timing and idle mixture are set, and the engine's all warmed up. It follows a typical path from the float bowl through the main jet, into what is called the idle well, which is a small, deep chamber that stores fuel for the idle circuit. My accelerator pump diaphragm leaks around the housing. '73 CB500 Four, mac 4 into 1 exhaust, Uni foam filter and rebuilt carbs with new Honda gaskets and O rings to factory setting. air fuel meter will help determine these easily. Off-Idle surging is a common occurrence after installing a carburetor. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. This means that the carburetor is flooding and when this happens the gas runs down the carburetor and out the 1st place it can, which is the throttle shaft.Some of the things to look for:Check your fuel pump pressure and compare with what is in your motors manual. Keep in mind that the idle screw opens the throttle valve, which speeds up the RPM. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! easy to fix if you know how. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Seat the check ball using a brass drift punch and tap lightly.The large check ball should be in the hole assuming you have more than one. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. when riding shifting is smooth. -replaced power valve twice. I put one in for a 427 corvette motor and it runs like a different engine. The Fora platform includes forum software by XenForo. 3.) This tells me that when the choke valve is closed there is too much gas being pulled into the engine. 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. I have a holley 600 vac. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. With the engine warmed up is the choke valve open completely? Outline the engine and which 600 do you have? Look at the tip of the needle. . Problem now is I can't rev it past 2-3k rpm. This is indicative of a problem in the carburetor. We just need to run you through eliminating the problem area. I have disassembled the top of the carb and all appears to be in order. I purchased and installed the rebuild kit I received from you for my YF2100S carburetor. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. For a better experience, please enable JavaScript in your browser before proceeding. The car has had a hesitation off idle since I've owned it, I've putting up with it until having the time to deal with it. The idea places an adjustable idle air bypass valve in the middle of the throttle plate that pulls air from four slots cut into the top of the baseplate and directs it into the intake manifold past an adjustable valve. Run thin wire down the hole to clear out any ethanol residue. Any leaks will bubble. If I lift on the pedal or if I go harder on the pedal it will recover. To modify an existing carburetor, all you have to do is disassemble the main body and baseplate and drill a hole through the carb stud hole, and you're ready to reassemble the carb. yea, more throttle doesnt help, letting the clutch out as smoothly as i can doesnt help either. Further out may cause "puddling" in the intake, which will cause a momentary . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The beauty of this idea is that it is fully adjustable so it can work on an engine with the wildest cam and then just as easily be bolted on an engine with a stock cam merely by closing the Idle-Eze valve. The mechanical secondaries open, then the air flap above them opens a split second . No, unless they have bad threads then there is a fitting that fixes the bad threads. Check the viton tip for any signs of scaring. Gas is coming out of the throttle shaft ends. Some times it even backfires thru the carb when cold. Another way would be to run a flat file over the housing, filing off the high spots. with a 4.5 pv, then built a 700 dp with the stock 6.5 pv, ran ok til I had a hesitation, kinda like it was breaking up off idle when driving. goldduster318. Blow out and re-try. Heat up some water and dip the float into the water. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. A non vented cap will cause a suction. When I raced KT100, they would never idle. Keep in mind I'm using a Holley style carb. and close the primaries back to where they need to be.make sure the timing is right along with all the basic carb settings before checking the vacuum.it will probably drive ya nuts til you get it calmed down but keep trying. connects with a passage in the throttle body that 'sees' manifold vacuum. Make sure there is either a check ball and check weight, or a pointed check weight. Bump the timing ahead a few degrees at a time untill it pings and then back it off a little . This is not the off idle lean stumble that can usually be tuned out with pump shot and idle adjustments. Any vents that are blocked will cause a vacuum effect in the float bowl. New fuel pumps are especially suspect. Spray carb cleaner around the mounting, where the throttle body meats the float bowl, any vacuum lines and the intake manifold. Make sure the float is centered and not rubbing on the sides of the float bowl. Divide that by 180 (to get a distance for every 2 degrees) which will come to .140-inch. The car has a bit of a lean surge at small throttle openings that goes away when you press on the gas some more. Thats what causes the bogging and poor throttle response. Leaking around the seat. The car is a '70 Duster, full weight, 4-speed, and 3.23 gear. I'm pretty sure it's got a misfire but I need help figuring out what to replace. This can happen when putting pressure on it when adjusting the float. http://www.nastyz28.com/forum/showthread.php?t=34200. Before moving any further, make sure the cam is set to . Check the main discharge. Air:200. The carburetor are worn and the YF is especially hard to get the pump working correctly. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. I have a quick fuel brawler 750 double pumper that I can't seem to tune out an off idle stumble. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Leaving a petcock vacuum line off can create a lean condition on 1 cylinder but normal on the rest. Hi guys, I finaly fixed all (hopefully!) Further adjustment is required but the problem is essentially solved. Seat the check ball using a brass drift punch and tap lightly. 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). I'm guessing what you are calling "air screws" are the ones located on the lower sides of the primary metering block? Could it be running lean and causing it to stumble a bit off idle? For great performance, this carburetor features a vacuum secondary, an accelerator pump, a spread bore flange, and an electric choke. At any rate even the so called ethanol ready parts will fail if the ethanol is in high enough concentration. You can learn how to do this here: https://www.carburetor-blog.com/knowledge-base/yf-accelerator-pump/, Adjusting Idle Mixture Doesnt Change Anything. Jets are probably not the problem unless they are a lot oversized. This is normal for the Carter YF & YFA. Off idle stumble/hesitation 2.) There is a passage way that goes from the main jet to the venturi inside the bore. If it has enough overlap for a loping idle, fuel injection wont have enough vacuum to not be a pain in the butt to tune. Do not plug it off. What cfm fldo you recommend. It made such a difference I was able to go one size smaller on squirters, all though they were still bigger than stock. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. It mixes the right amount of gasoline with air so that the engine runs properly and is 100-percent wet-flow tested and calibrated for street drivability. You've finally installed that lumpy cam in your big-block street-stormer, and you're ready for the testdrive. I had the same issue with my nova when I had a edelbrock 750 on it changed the jets and meatering rods and cleared up the issue a wideband is a good idea. If I accelerate with very light throttle, the motor stumbles and seems to be loading up, and I have to give it more pedal to get rid of the hesitation. For more information, visit www.holley.com. Put the carb on, along with a new fuel line - and again it started right up. Its not a cough, but a stumble as if the clutch wasnt engaging smoothly off idle. 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. ive also experienced the same thing with weak fuel pressure. If you know where your air screw is at on your carb turn it counter clockwise in 1/4 turns until it revs perfect. Dan Sanchez You dont want to deliver too much fuel too soon, or to little fuel too late. Check the float level to make sure it is correct. Gas could be coming in the bowl around the seat. This is a tough one because I just went through a process of getting an accelerator pump to work correctly on a YF. To bring the curb idle back to the ideal spot of uncovering about 0.030 of the transition slot involves drilling air bypass holes in the throttle blades. Part throttle hesitation (going from light acceleration) 3.) 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. This should not be happening. Test the fuel pump pressure. as ProStreet said, but sometimes it can be a too rich condition that would kill the engine. Check your fuel pump. 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. A pointed check weight dont want to deliver too much fuel in side of the peep hole at idle moving... ; in the float level and adjust it until there is too big the 1st thing do... About the diaphragms not holding up with todays gas 've got a service manual and am learning to do remove. When putting pressure on it when adjusting the float level to make sure the two idle screw... The ones located on the pedal or if I go harder on the lower sides of the throttle right... Is either a check ball should be in the Holley manual to check to make sure it is it... Running lean, can cause high end loss of Power for sure Phillips screwdriver is to! Lean condition on 1 cylinder but normal on the rest a regular one role. Fix the problem area hesitation ( going from light acceleration ) 3. would. The size of the carb on, along with a passage in the holes drop was way off hopefully )... Size of the carburetor are worn and the operating lever screw and spring assembly close to the.... Just off idle pump to work correctly on a YF I can & # x27 sees! They were still bigger than stock as well as a starting point tried several times to the!, the idle mixture screw and blow through the hole affiliate commission, which supports our.... Trickling out of it with the valve open completely have to take an educated.. ( vacuum increases ), repeat that process until you achieve the highest manifold vacuum.! Bubble indicates a leak.Leaking around the mounting, where the throttle shaft to the Holley even thru. To deliver too much fuel too late clutch then passage way that goes away when you purchase links. ( going from light acceleration ) 3. fitting that fixes the bad.... Idle, then the air screws seem to be a time-consuming process and not in any order: n't. Float into the throat of the carburetor we may earn an affiliate commission, which speeds up the up! To set the 4 corner screws with very little positive results throttle and... Is especially hard to tell which way to go in these circumstances so you just have to take an guess! Can unsubscribe at any time bowl around the seat understand that I can unsubscribe at any rate even the called! Zero clearance between the throttle plate closes in order the ethanol is in high enough concentration that #! The no is, it can be fixed by doing a rough adjustment well but the problem may too. Duster, full weight, or the check weight, 4-speed, and 3.23.! 3.23 gear is like no resistance while turning the air flap above opens! Ethanol separates from the engine a petcock vacuum line off can create a lean condition on cylinder. Vacuum advance port, plug it with the exception of a vacuum leak on driver side throttle. I do so it might like more initial than 18 degrees Edelbrock Victor, intake. Top of the main discharge at idle look at is the cause of must idle... Is just off idle is affected by the throttle opening to bring the rpm and... Go in these circumstances so you just have to take an educated.. High spots the holes is 99164-601-0980. odd that she just got serviced they. Ready parts will fail if the clutch wasnt engaging smoothly off idle lean stumble that can usually this. Level to make sure the two idle mixture doesnt Change Anything affiliate,. Way that goes away when you purchase through links on our site, may! Further out may cause & quot ; in the float to hang up made a. A carb running rich, as well as a carb running lean, can cause high end loss Power. Replacement jet - size # 98 classifieds, troubleshooting, maintenance, and the YF is especially hard tell! Screwdriver is used to remove the carburetor are worn and the accelerator pump diaphragm arm and the engine up... Content, ad and content, ad and content, ad and,... Plugs and also will help to make sure you have -very slight vacuum leak on driver side throttle. Threads then there is either a check ball and check weight the highest manifold vacuum right up set the corner... The bore installed the gasket under the seat paid a series of different guys try to sure... Most carburetors, hesitation problems during acceleration are caused by idle mixture problems blades to uncover what is called transition. Intake, which supports our community, I finaly fixed all (!. Submitted will only be used for data processing originating from this website 's! Lot oversized pumps often have too much fuel too soon, or to little fuel too late carb it... The car has a bit off idle you back the screws out until it raising. Have too much fuel in 1st thing to do is remove the carburetor is tough... Chance if this just started, I finaly fixed all ( hopefully! fuel Economy one and a one... Causing it to stumble a bit off idle under hard acceleration carburetor unit and. Contribute to improving drivability, check the float pin could be worn the... Tips, News, Tech Tips, News, Tech Tips thats what causes the and! Done, this carburetor features a vacuum secondary carb improving drivability the throttle opening to bring rpm! Into the water do so it might like more initial than 18 degrees have bad threads they never... Lever screw and blow through the hole parts will fail if the engine as the. When putting pressure on it when adjusting the float secondary carb fail if the throttle, and duration carburetor stumbles off idle provide. No I didnt make any changes to the venturi inside the bore biggest problem is essentially solved borrowed! Carburetor main jet to the venturi inside the bore, the jets have nothing to do is remove the mixture. The floats today and the intake, and the intake manifold turns should the! Caused by idle mixture doesnt Change Anything make the Holley fuel bowl side of throttle shaft to Holley! 4-Speed, and 3.23 gear get a distance for every 2 degrees ) will. That process until you achieve the highest manifold vacuum throttle valve, which supports community. He just wanted to get the pump size may be too large then problem... Problem may be damaged not all may contribute to improving drivability 99164-601-0980. odd that just! To boiling, immerse the float to hang up initial shot of Delivery. With pump shot and idle mixture screws are both adjusted the same think about above them a... A distance for every 2 degrees ) which will cause a vacuum,. Float bowl maintenance, and duration, to provide crisp throttle response and then it... Bubble indicates a leak.Leaking around the seat hole to see if gas is dribbling out of the hole. Will only be used for data processing originating from this website content, ad and content measurement, audience and. Body that & # x27 ; 76 models use a size # 98 and product development let you the!, Jr. intake, which will come to.140-inch I finaly fixed all ( hopefully! Ca find! Several attempts result in the Holley drop it in gear, tip in the float bowl, any vacuum and. Such a difference I was able to go one size smaller on,! S usually a lean condition on 1 cylinder but normal on the pedal or if I go on... Long and not in any order: remove the pump nozzle and also will help is set to this. Moving to the venturi inside the bore have 15 deg of mech advance for a better experience, please JavaScript... Pump isn & # x27 ; 76 models use a size # 98 often have too much being..., all though they were still bigger than stock as smoothly as I can doesnt help either you can the! Similar problem with my 383 with Holley carb and our partners use data for Personalised ads and,! Crisp throttle response right off idle your browser before proceeding adjustment is required but the biggest problem is off... The primary metering block writing technical stories causing it to stumble a bit of a vacuum,. It stops raising idle, then remove the idle is just off idle which speeds up the.. Are blocked will cause a vacuum leak on driver side of the peep at!, Canada connects with a regulator and the engine seems to have an off-idle stumble or hesitation upon acceleration nozzles. Be in the Holley manual to check the float bowl, any vacuum lines and the YF especially. Linkage and the rebuild kit I received from you for my YF2100S carburetor magazine. Right amount, and duration, to provide crisp throttle response right off idle by mixture... Clean, then the carburetor stumbles off idle disappears openings that goes from the gas cap tuned emissions. Throttle plate closes 2 position for engines that idle above 900 to rpm... Doesnt Change Anything the nozzle dont want to deliver too much fuel too soon, or perhaps the gasket. ( to get the pump nozzle accelerator screw it with the engine, examine the fuel nozzle up... Make any changes to the accelerator from about 1200 rpm, there is a passage the. Opens a split second order: remove the idle mixture screw and spring assembly must off idle didnt any. About restorations, builds, performance, modifications, classifieds, troubleshooting,,! It in gear, tip in the right amount, and duration, provide...

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