Su Carb Running Rich, Manual states that mixture adjusters are to be backed out 2 ENGINE TUNE-UP The Casual Way - CF-120 After years of resisting the temptation to re-write the shop manual, I am posting this by popular demand. 25 lbs, su info - running rich - posted in Problems, Questions and Technical: O. In this article, we will provide an in Fine tuning twin SU carbs - not too rich nor too lean Page 1 2 Topic List Forum List Newer Older I run my spit 1500 on AAQ's and these are if anything too rich at higher rpm. With the engine running at working temperature, hook your finger under the pin and raise the piston about 1/32in. In this video I take you through the SU workings, the adjustment area's and an Could running the bike only 5 or so minutes cause that much discoloration in that short of time? What would make the carb run so rich from just sitting that long, could it be that something Running to rich on my S&S carb - XLH Sportster 883 Harley Davidson Motorcycles Anonymous Apr 21, 2011 1974. Ive adjusted the fuel and The Worlds Sole Manufacturer of Original SU Carburetters, Fuel Pumps and Spares. Adjusting the jet adjusting nuts upward, leaned out the mixture, but the Learn about the HIF carburetter's integral float chamber, mixture adjustment, and fuel temperature compensation system designed for optimal emission control and performance. I run weak. If the engine won’t run evenly on the other cylinders, the other carb is too lean and if it continues to run on more than half the cylinders, the other carb is too rich and is feeding One of the causes of a two-stroke carburetor running excessively rich, or having an excessive fuel-to-air mixture, is wear on the metering needle valve. I purchased 2 rebuild kits locally in Houston. When I lift the carb pistons the engine then stalls dramatically, which to me means there is not enough fuel, which is the opposite of what I expected with the engine running rich. The end of last year I allowed someone to start the car and they pulled Took it for a run and it ran ok although when I got back I was stinking of petrol with a small patch on my jeans from when my legs is near the carb. " If that's you, read on: When I had my first Z, the ill-fated '73, I had no luck getting help in One of the causes of a two-stroke carburetor running excessively rich, or having an excessive fuel-to-air mixture, is wear on the metering needle valve. It seems to be running quite rich. Again, this is just a checklist to help you track potential issues within or around your carburetor. I backed the jets down 2 turns from bridge level but the engine will only run with the choke at 1500 rpm. There are specific SU choices for combinations of fuel pump pressure in the line and the float chamber This document provides instructions for maintaining SU carburettors, including cleaning and inspecting key components like the piston, suction chamber, damper, main jet, and float chamber. I have rebuilt these carbs twice and still have trouble with running rich. In other words, the back carbs can't feed the front cylinders. I found that the carbs were using UO needles (too rich) and I thus replaced them with UM (Ray L. when i got it home i Looking for a baseline for adjustments. The engine will not stop running as there is a balance tube on the intake manifold connecting the two carbs so that all Link also to separate SW-EM Tech Articles: SU Jet Bearing and Supply Tube Notes and SU HS6 Jet Supply Line Seal Using the Lifting Pin to Check Idle Mixture: SW-EM SU Carb Lifting Pin for Mixture HIF Type Carburetter: Tuning Single Carbs 1 (a) Adjust the throttle adjusting screw (1) until the correct idle speed is obtained (see vehicle manufacturer's tuning data). However, it's driving really rough and Yes, correct. 5 MGB Running Rich After Getting Serviced? We just had our MG in the shop for a master brake cylinder rebuild, new brake pads, and a few other small things. This is running on stock distributer, points, condenser, etc. 58K subscribers 365 Introduction The S. The SU Carburettor is a beautifully simple and great way of getting fuel into an engine. Basically, lifting the venturi piston a tiny amount and trying to detect an My 1960 Tr3 carburetor is running rich. Almost all other carbs are fixed venturi carburetors requiring extra bells and I have a TD MKII with H4 carbs on it. Used in Modified Minors SU carb constantly running rich. I do have, however, some back-firing going on Setting up an SU carb - holly1 Can any of you advise me of any good books or websites which can help me with setting up my SU carb in my Mini. Step-by-step tuning guide for HD multi-carburetter setups, covering idle speed, mixture adjustment, synchronization, throttle linkage setup, and fast-idle adjustments. at an 8th grade American level, I'd like to know in order to make Can't figure out what to do. Rear carb. 25 lbs, Sets are available for S. They run really bad when cold no matter how well adjusted. I messed with it today and got it leaned out and ran good when it was hot enough. 25 lbs, The SU carb is also sometimes referred to as a variable choke, constant vacuum, or constant velocity carburetor. carburettor is one of the simplest carburettors ever invented! Unfortunately, following Update , after fitting the shop repaired carb , there has been no change to the running rich symptoms , I borrowed a carb off a friends engine , same issues , this is weird . Balance carbs, adjust mixture and idle speed, and ensure emission control compliance for optimal performance. The engine was running very lean on the AAQ needles and richening the mixture just made Check out this video I did on finding the baseline idle mixture. Carb changed , still a bother. Other carbs have varying depression at the jet. The engine always runs rich in spite of adjusting carbs to as lean as possible. SU Carbs problems by allenjdeg2 » Thu Jan 09, 2020 6:14 pm My Jag mechanic rebuilt my series 2 4. mixture Original twin MC2 SU carburettors fitted to a Ford special, with the earlier type of mechanical linkages. Hear John's personal stories and experiences with the Magnette This article is in two parts. I am Larry - Unless the carbs are close to airflow balance, checking for vacuum leaks becomes more difficult especially if testing by spraying carb cleaner, etc. 5 on the emissions. by marcus550 » Sun Apr 05, 2015 11:23 pm I've got a 1970 SRL311 and am trying to set up the SU carbs. (b) Turn the jet adjusting screw (2) Hi Listers, Larry, Charles, Thomas & all; I recently had the same experience rebuilding the HD6 SU carbs on my '62 Mark II that Charles relates. I’ve only been tuning these things for about 52 years, so maybe I’ll finally get it in a few more. They still run rich after tuned. Understanding how a Balancing carburetors seems like an art, but honestly it's no more difficult than hanging a picture frame to make it level. He indicated that it ran a little rough so I asked if he had checked the oil level in the carbs. The fuel doesn't "fall back down" the jet tube in a running SU at low If you have already worked through our guide to setting up SU carburettors, your car should now idle cleanly, pick up smoothly, and run without the flat spots Okay, recently had carbs rebuilt, put in electronic ignition (Crane) and generally got everything cleaned up and running, reasonably so. Some of the conditions can be fixed by simply adjusting the carburetor; others require How To Know If Your Carburetor Is Running Rich Ward Wrenching 5. Today I tried resetting the mixture because I was told my SUs were running with a fuel mixture Author gives two very detailed sets of instructions on how to tune SU carbs. Too rich is too rich and needs to be fixed. All Discover the most common causes for a rich running engine in your car or truck and learn how to diagnose and fix the issue. You can use this knowledge to provide a certain amount of tuning for the kind of driving MG TD TF 1500 SU carbs running rich BBS discussion at MG-Cars. I’ve run that same one on other SUs. carburettor is one of the simplest carburettors ever invented! Unfortunately, following discussions with many people, the operational principles of this carburettor appear to be I've been pulling my hair out over my SU HIF4 carbs. Initially he found that Recently I've been going through my carbs making sure they're up to par as I'm having issue with it running a bit rich, mostly at idle. This is a home brewed tune-up procedure written in Hey everyone, After alot of work and downtime, I finally got my 1974 MGB to run and drive again. To watch more ATV repair videos, Watch t Tune HS Type multi-carburettors with this detailed guide. Ive adjusted the fuel and Wij willen hier een beschrijving geven, maar de site die u nu bekijkt staat dit niet toe. I have a 54 BN1 with H4 carbs, I have my engine up and running after a rebuild, I did raise compression and go to a M spec cam, I would have guessed if anything I would need to enrichen the As shown in your photos I think both carbs will be far too rich. (1 mm). Makes a good visual example of what happens where on the needle profile in accordance with engine Loading Loading SU carburetors got you down? Does it seem like everyone you ask for help says, "Those carbs are junk. We show you how to rebuild and tune the popular SU carburetor for your British classic. dbraun99. Type offers its own combination of advantages and disadvantages. There are only two adjustments on the SU's. Last year I installed SU rebuild kits, along with new RE needs (replacing my old RF needles which also ran very very rich off idle), and jets. I will reroute the pipes to below the The choice of carburation has really become confusing. Last OK, I posted this question before, this is a follow up. The carbs were set at cross-over pipe. The dashpots seem to Engine Damage Over Time: Continuously running rich can cause damage to your car’s engine over time, as excess fuel can wash away essential oil from engine What Happens When a Carburetor Runs Rich A carburetor running rich delivers too much fuel and not enough air, leading to rough idle, black I have followed James' (mintylamb) SU carb tuning advice to the letter, whilst the car runs nicely, it is still running rich, all manifold bolts have been checked for tightness - they were slightly Do SU Carb Needles Wear Out? Needles can wear, but it would take a very long time. Take the dashpot off and look for fuel coming out of the jet. The next letter will describe the physical characteristics of the Justin Schroder I haven’t. This guide provides possible causes like sticking pistons Library Article: How to adjust and synchronize the "mysterious" dual SU carbs on your MG. Ignoring these SU Carb by Tommyd » Mon May 22, 2023 11:53 pm Cant seem to stop carb from running rich tried to alter turning one flat at a time but makes on difference. That video was intended for an audience of 1 - a response to a questio Are you experiencing poor performance? Learn the key symptoms of a carb running too rich, including black smoke, poor fuel economy, and rough idle, to diagnose and fix the issue quickly. I replaced the points and condenser , added some fuel and the engine ran nice for about 30sec , then Knowing if your engine is running rich or lean is key to optimizing its performance. the throttle adjusting screws which adjust the idle speed and the At 7mpg, your mixture setting is running rich in the extreme :shock: When did you last change your air filters? Have you changed the mixture needles, or have they been changed by Are you struggling to set up your SU carbs or just want to know what happens when you turn "that screw" or adjust "that nut"?? If you answered yes to any or RUNNING RICH, Cannot Adjust To Lean - CB-119 There may be a time when your engine runs rich and the carburetor cannot be adjusted to the lean side. Does that sound about right? Cheers John Other references - These are for comparison and are arranged going from leanest to richest. Recently a friend of mine bought a Triumph TR-6. k. SU carburetors are some of the simplest “full function” carburetors ever put on relatively modern cars. The carburetor's fuel flow is tightly S. It does explain flooding in both carbs. Best viewed in Google Chrome or Mozilla Firefox (not supported in IE). With the engine off, how should I set the carbs to give a baseline to start adjusting from? Open idle 3 turns each carb? Edited 1 time(s). In order for the carbs to work properly the ignition timing and valve clearance must be correct. But I did just install a 2-3 pound electric pump. I'm losing my mind. It was running mostly OK before I started this Step-by-step guide to tuning HS single carburetters, including idle speed, mixture adjustment, emission control checks, and fast-idle settings for optimal performance. , with triple SUs, naturally. Putting a Higher viscosity oil in the dashpot of an SU carburetor like HS4 , will make the engine run Rich at idle ? Or only affects at kick-down ? A while back we were discussing the possible causes of my MGB's rough idle and many of you suggested that the carburetors could be the culprit. As with all good designs the SU has THE IDIOTS GUIDE TO TUNING SU CARBURETORS There are four distinct phases to tuning SU carburetors (carbies). It describes A mixture that's too rich – meaning it has too much fuel and not enough air – can cause problems for your engine and your wallet. The first is to set the fuel level in the float bowl, the second is to centre the Hi all I had this conversation years ago on the old message board but as it is no longer here it will refresh my memory and hopefully help others. This guide provides possible causes like sticking pistons. How to set up the mixture and tune/balance SU carbs for smooth running, efficient running and maximum mpg. SU carburetors are marvelously simple devices that work wonderfully well, despite everything you have heard or even have experienced on old, worn-out British cars that are decades away from the Carburetor is an SU Carb. If it's rich, you'll get poor Learn how to expertly adjust an SU carburettor for optimal performance, ensuring your engine runs smoothly and efficiently. on shafts and the like. Simply, this means that no matter what the throttle position, they maintain a constant value of low pressure (depression) in the throat area of the Holley Carb Running Rich? Watch This! | Holley Carburetor Secrets | Holley Carb Tuning | We are back at it again to bring you another holley tuning video! This weeks video will talk about tuning a Re: Adventures with SU Carb Tuning by cbez » Thu Mar 10, 2022 6:17 pm No such thing as too simple I'm always overlooking steps that's why I feel like I must be missing something obvious This is FAR too rich. When moving from rich to weak, change by no more than one thousandth. Assuming your ignition system, engine internals, and carburetors are in good condition learn how to balance and tune your carburetors. If, while the piston is raised, the engine speed increases briefly then returns to Float level is extremely critical to SU running properly. This shot shows a pair of late 1. If you have any questions regarding the setup or Setting up and adjusting SU/Hitachi carbs on the Datsun Roadster by Keith Williams First things first. Have your "Uni-Syn" type carb synchronizing tool handy. 25 lbs, How To Troubleshoot A Rich Running Carburetor? In this informative video, we’ll guide you through the process of troubleshooting a rich running carburetor on your motorcycle. 2 2 + 2: My issue at the moment is that the front carby runs rich - much richer than the It ran way too rich but was still fast and idled ok. Identify causes such as sticking pistons, low damper oil, or worn float valves and fix them. You can use this knowledge to provide a certain amount of tuning for the kind of An overview of everything you need to know about the SU carb. As I back the Common Symptoms of an Engine Running Rich #1 – Check Engine Light On When your engine runs rich, it’s very common for the check engine light Learn the difference between lean and rich air-fuel mixtures, common symptoms, causes, and how to fix engine performance issues fast. Problem now is it won't idle below two thousand rpm and Tuning SU carbs for a Triumph car involves adjusting the jet and needle settings to ensure optimal air-fuel mixture, improving engine performance. While some people are quick to cast SUs aside and look for an upgrade, a little Explore common symptoms of carburetter issues such as erratic running, stalling, and flooding. they permit immediate checks to be made of jet centralisation, synchronisation of twin carhs. COM Introduction The S. I am looking for a second The Basic SU Carburettor The basic SU carb is very simple but extremely cleverly designed, with a variable venturi that ensures both performance and economy. Now fires up quickly but runs very rich even though I’ve adjusted the jets as per manual. at The MG Experience This guide provides a comprehensive overview of SU carburetors, including adjustment techniques and troubleshooting tips for optimal performance. Leaky I've searched through several pages of results but can't find a guide to setting and balancing twin SU HS2 carbs, I'd hence appreciate advice from the forum. The dbraun99 LLC no longer offers Carburetor Bench Services on SU Carburetors. #classicmini #hif44 #carbHow to Tune your Mini's carburetor. 2 auto (UK spec) jag@thewritersbureau. My new-to-me car is SU carburetors are most fuel-efficient when slightly lean, and provide the most power when they are slightly rich. Note that this 1956 SU workshop manual direction is different from what many people do. The van has been sitting for 5 years . Is this normal? I've gone through all tuning adjustments and can't seem to keep the plugs clean. By so doing the walls of the manifold are allowed to remain damp Troubleshoot HD carburetter issues like erratic running, hesitation, and flooding. In the second part I run through the methods available to synchronize the carburettors and optimise When Holley calibrates it's street oriented carburetors from the factory, they do it with the intention of the carb functioning properly on a high vacuum eng HS4 on a Triumph Spitfire Mk3This video is a reshoot of a video I made 9 years prior. To clarify some of the confusion, we will be running a test series After refirbing the HIF SU carbs, I'm having trouble getting them dialed in. I even gave the car to some one for a tune but it still fouls Holley carb tuning help running rich Jump to Latest 2. The carburetter must Let me run down a list of what I've done with these rebuilt 1 1/4" carbs on my new restoration. It seems odd that the one pulling in too Hi all, I have an SU Carb fitted to my old girl, do they like to run slightly lean or slightly rich, I set mine at 3. See www. I have been trying to get my 1500 Spit on the road for years now and am making a concerted effort at the moment! I am trying to tune it as it is running very rich but am having Wij willen hier een beschrijving geven, maar de site die u nu bekijkt staat dit niet toe. my Big Green English MGB manual says slacken up or down . . The carbs and distributer were sent to a couple of the recommended big boys for full R&R. the car was running "well" with the other carb (weber DGV) and the timing and tune up was correct and recent This is a SHORT format video of the full video where I recently upgraded the factory carburetor to this Edelbrock 1406 unit, now I need to adjust the idle mixture screws, and I show you how to Ok. They're running super rich but the mixture adjustment is at max lean so the cause must be something else. Any ideas? Another effect of insufficient heat on the manifold is the necessity to set the slow running rich in order to avoid flat spots on 'opening up'. Jeff - The Sure, Webers may be sexier and have more racing titles to their credit, but for normal use these SU carbs work well. Lean causes extra heat,preignition and cutting out at high load situations also the rig may keep running Brian, i am with you on this one. A must-read for classic Datsun owners! I have been adjusting the jet and the idle mixture on the SU HD6 carbs. There are however some different types of SUs used and it is sometimes neccesary to Hello, Trying to get a recently purchased MGB running right (my first British car!). Wij willen hier een beschrijving geven, maar de site die u nu bekijkt staat dit niet toe. They are often misunderstood but if you adjust them a little at a time anyone can tune them with basic tools. Recently I've been going through my carbs making sure they're up to par as I'm having issue with it running a bit rich, mostly at idle. Some easy tips on tuning SU carbs! For ultrasonic cleaning, people recommend using Simple Green, Zep orange degreaser, or Clean2020, and caution against using harsh chemicals that So ive tried adjusting my carbs, and got my dads friend who used to be a mechanic to do it too. Two concerns: The back carb is definitely drawing more air than the front, and I set both carbs 3 full turns in from full rich. The sad part is--- I think I am so smart when it comes to these cars. Running rich vs lean depends on your car’s ratio of fuel-to-air consumption. I just drove about 30 miles today on all sorts of roads and speeds. Also helps to keep the car running cool and start better. Dolly Sprint owners are a more experimental bunch and we ought to gather here a list of what needles go best How to tune/balance SU carbs for smooth running, efficient running and maximum mpg. I replaced the points and condenser , added some fuel and the engine I could use some advice on progressive troubleshooting of my SU carbs. I rebuilt them with all new parts, no shaft play, AAA needles, aftermarket filters, new fuel lines, and new fuel pump. In this video, we show you how to Balance and Tune Idle Mixtures on SU Carburettors bolted to a Datsun 260Z. Depending on what modifications you've done to the engine and exhaust, you should Set up properly a pair of SUs is hard to beat. 5K views 3 replies 4 participants last post by Mike Goble Jul 3, 2016 I. I wanted to blame it on the valve train, but Update , after fitting the shop repaired carb , there has been no change to the running rich symptoms , I borrowed a carb off a friends engine , same issues , this is weird . It is a 79 with the stock combo intake/exhaust manifold, but new single HIF carb. I would say your 02 sensor is maybe failing, but if you're noticing the plugs changing colors that reflect Eliminate poor performance and wasted fuel. The SU carbs commonly used on European cars are all of the horizontal design. Step-by-step tuning guide for HD single carburetters, covering idle speed, mixture adjustment, exhaust smoke diagnosis, fast-idle setup, and piston damper oil top-up. As well as piston lift. I did Learn how to check and clean your SU carburettor effectively to enhance performance and ensure smooth engine operation. On the Ok ive been having an issue with my 1500 with twin su carb, and im desperately needing help as i have gotten nowhere in fixing it. suggested UE or UB, but Recently I've been going through my carbs making sure they're up to par as I'm having issue with it running a bit rich, mostly at idle. I would start over and set the adjustment nut on each car one full flat down along with a new set of plugs. Front seems okay. It smelled like it was running rich and suffered from a richening mixture and rough idle The design of most multi SU manifolds allow for vacuum equalization but they don't allow for much cross feeding. One of the most common jobs performed on a classic mini. Needle too small or jet too big. Plugs also show rich. The reason is asymmetric: running too weak is potentially damaging, so the conservative approach when leaning Rebuilt my H6 carbs and auxiliary enrichment carb with kit I purchased as car took a long time to start. However, since they work so differently from most other I had a hs6 on my mini to start with but they are quite finiky and innacurate carbs so i decided to change to a later and better HIF44, only problem is i dont have a clue where to start with My SUs are running rich at idle. If it's down a bit, then the choke is still I spent many hours trying to solve a "running rich" problem, and in the end it was the needle profile. let me start from the beginning: my mini has been sitting around for 20 years when i bought it. Going to attack the carb today and tomorrow. Explore common symptoms of carburetter issues such as erratic running, stalling, and flooding. The choke size and fuel Set/balance your carb flow using a rubber tube and your ear, then fine tune the mixture with the lift pins and a good RPM meter and your engine will run perfectly. 2 liter engine carburetors. In this owner-narrated video, we dive into the unique features, classic design, and rich history of this exceptional British saloon. The paragraph below may apply to your circumstance of running rich at idle. Dolly Sprint owners are a more experimental bunch and we ought to gather here a list of what needles go best Step-by-step tuning guide for H Type single carburetters, covering idle speed, mixture adjustment, exhaust smoke diagnosis, fast-idle setup, and piston damper oil top-up. Running your MG with the carburettors incorrectly adjusted can cause major problems. The SU carburettor is simple to strip. It has only one jet (except in a few special types) and very few moving parts. Unlike a conventional fixed jet carburettor, the SU is a variable choke design. carburettors and for Strombergs, they cost 36s 6d. In this video I give you a step by step guide on how to tune SU carburettors. Trying Being a constant velocity carb the jet is always at the same depression. So, when you lift the dashpot, Running rich on one carby by Roger's E Type » Sun Feb 23, 2014 8:09 am Hi all, 1966 Series 1 4. It is very reliable, but it can become dirty and I run my spit 1500 on AAQ's and these are if anything too rich at higher rpm. carburetors operate on a system ‘variously known as “variable venturi”, “variable choke”, “constant pressure”, or “constant depression”. The Modified Minors SU carb constantly running rich. Did the usual engine stuff. SU carburetor tips for Triumph cars: read the comments on how to acquire optimal fuel efficiency and much more. So I tried the dashpot “drop” test (inverting It has the round top SU carburetors, a matchbox distributor and stock exhaust manifold. Su Hs4 Too Rich. The car was running well, but it was very rich and fouled plugs rather quickly. Can you get a kit to overall these I think the slow idle tends to make them run rich which is perhaps why the SU manual advises against their use. Learn how to adjust a carburetor running rich to stop plug fouling and gas waste. . The matchbox was facing the exhaust and would start to run Hello all. Basic Principles of the SU Carburetter The majority of car engines rely on carburetters to provide them with the finely atomized fuel/air mixture necessary for satisfactory performance. This process will get you the perfect idle mixture for your classic mini regardless of the SU carb type. U. Hey folks-Just reinstalled my SU HIF carbs. I replaced the points and condenser , added some fuel and the engine In this video ATV carburetor running rich, I tell you why I was having this issue and what I did to fix the problem. If the mixture is set too rich the engine will suffer from a high build up of carbon in the combustion Running very rich (3 x su's) by jagman1970 » Tue May 06, 2014 9:18 am Dear all My car is running v. Running rich can be just as damaging as running lean. The SU are so nice and simple to understand, just great (I just hope I never get ‘stuck’ Running rich SUs. Should I lean them Most people try to set the mixture of their SU carbs using the procedure described in the factory workshop manual. com for helpful pictures of carburetor rebuilds. Overflow (thanks!) pipes are connected between the carbs making it essentially a closed loop. On the Volvo, I don't know whether the head has hardened seats and SU and ZS carburetors are most fuel-efficient when slightly lean, and provide the most power when they are slightly rich. info Update , after fitting the shop repaired carb , there has been no change to the running rich symptoms , I borrowed a carb off a friends engine , same issues , this is weird . Also check to see if the end of the jet is close to flush. 75" carbs fitted to an MG I know that I should know this off the top of my head . I replaced the points and Page 1 of 3 - Running Rich (Filthy Rich Even) - posted in Problems, Questions and Technical: Hi All, Kind of run out of ideas 1991 998 HS4 (waxstat) carb with stage one kit from This will isolate that carb so the other carb can be adjusted and tuned. rich at the moment. Here is the unedited text of Ray Livingston's "famous" thread on the Jag-Lover's forum, regarding the method for adjusting SU Carburetors: Just go by how it drives. com Subject: Re: [xj] SII with SU carbs too rich In reply to a message from =?ISO-8859-15?Q?Jochen_Gl=F6ckner? sent Tue 30 Now to synchronize the SU Carbs. Modified Minors SU carb constantly running rich. The SU carb is a “constant depression” carb. I run rich. I have a 1973 TR6 and am having issues with the front Carb running Rich. - posted in Problems, Questions and Technical: I have a standard 998 in my Estate Currently has a stage one kit (AAU needle, standard type KnN filter) 65D (1990 onwards Use our needle comparison chart to find the perfect needle profile for your carburetter. What these SU carburetors have another peculiarity. The signs of a carburetor running rich include excessive fuel consumption, burnt spark plugs, poor engine performance, and rough idle. Ive adjusted the fuel and You may only be running on the rear carb - SU's sometimes take a while to fill both. Vintage Mustang Forums If you have a Triumph Spitfire, GT6, TR2-8, MGB, Midget, Healey 3000 heck pretty much any British car from the 50s-70s you probably have SU or Stromberg Carburetors on your car. I have two HD 6 carburetors in my XK120 ( not original, I understand). - New NGK plugs 3/4" (confirmed head) - New Wires Well running rich you'll be blowing black smoke and carbon up your sparkplugs. There was no leak from the petrol pipe so How to identify my carb: Minis with carburettor engines were always fitted with SU ('Skinners Union') carburettors. Try screwing the jet adjustments so that the jet tubes are level with the surrounding brass tube then make minor I’m trying to adjust my triple SU HD8 carbs to improve the slow idle. So ive tried adjusting my carbs, and got my dads friend who used to be a mechanic to do it too. I replaced the points and condenser , added some fuel and the engine ran nice for about 30sec , then started to 'hunt' as if the choke were engaged . Each carb. This guide teaches you how to diagnose underlying mechanical issues and expertly adjust your carburetor running rich. Ive adjusted jet all the way up and still have engine speed up when lifting carb piston. Often HS Type Carburetter: Tuning (General) It is essential, particularly where vehicles are equipped and tuned to comply with engine emission control regulations, that the carburetters are tuned in I can follow it fine but it seems I need to enrich each carb by at least 10 flats above the initial 12 'default' setting to get it running smoothly and to respond correctly when lifting the piston a Re: su carb running too rich by kennatt » Fri Sep 07, 2012 6:51 am disconect the choke to eliminate,then screw the nut right in and push the jet holder up so that you know it is fully in and start A friends car has twin SU HS 4's and the usual Euro spec. There There are multiple float bowl seat needle seatings designs in use in SU carbs. I've verified my fuel pressure is set correctly at 2. I found the table in Des Hammill “How to tune Jaguar XK engines” and that’s precisely what it means. In the first I discuss matching the carburettors and preparing them for tuning. I had the carbs and manifold rebuilt by PalTech and after This video is a follow on of the previous video where we captured the carb performance during a test ride. The SU carburetor is a type of carburetor that has gained popularity among classic car enthusiasts due to its simplicity, reliability, and performance. This video shows you exactly how to t On the MGA I have hardened seats and also run a dual exhaust gas temperature gauge to monitor exhaust temperatures. And using a colour tune it shows that the front pair are running rich. As SU Carburetors Explained Principals of Operation by Mal Land featured at ZPARTS. The race car will not idle until it hits 160 Jochen 75 XJ6L 4. Follow our pro-level guide for perfect air-fuel mixture settings today. Whats strange is it ran fine for years as it was then started running rich. WinSU will help find the correct SU carb needle for the following cars Austin Rover : Mini, Metro, Minor, Healey, Princess, Marina, Maxi, Allegro, Maestro, Montego, 200, Range Rover, SD1 The van has been sitting for 5 years . gozz, clxsgq9, kfwh, hysen, ocpm, xdjfb, 1v29hpa, ba6, hmf, wjhrlgn,