What an excellent series of videos, the best I have seen on the SU carb. and tuning of this type of classic engine. Thank you for making them. I can see that the good old colourtune might have advantages with a twin carb set up too. I have been looking round for ideas to reduce emissions on my old MG as I have been told that if I import it to where I now live that its yearly road tax will be directly related to the tested emissions output of the car as it will be regarded as a brand new car despite it being 70 years old! That air/fuel ratio gauge has really given me something to think about

Really enjoyed this series of videos. Thank you.

Good videos (I saw part 1 and 2) very informative and hands on stuff, my Morris Minor needs a tune up !!! Very well made sir

Excellent comprehensive explanation of SU Tuning options. Thank you.

Nice, I have the same AEM AFR sensor and gauge and mine fluctuates a LOT more. your tutorials are very good and very helpful !

Your clear explanations and demonstrations have given me the confidence I needed to start to learn all the nuances of SU carbs.Thank you very much.👏🏻👏🏻Subscribed.

Thanks for an excellent video on tuning a carburettor. I have now ordered my Colortune as it appears to be the most economical way of tuning the carburettor. I had not heard of such a device but I am very impressed with the technique. I presume it will work with two stroke engines such as my chainsaw and hedge trimmer. I wish you well for 2021. Keep up the good work. It's invaluable to very many DIY persons. James from Dublin

Just wanted to say this series has taught me a lot about the theory of tuning a carb and how an AFR gauge helps. I’ve never tuned anything before, and I’ve got a 67 Cobra replica with a 351 Windsor and carb I’m working on. Very different than the Mini, but the principles are the same. Feeling a lot more confident about the work ahead after watching these videos!

Smashing video, best I've ever seen on the topic. Very plain and clear explanation. Oh and comprehensible speech. Thank you very much.

Thank you so much for your advice on the hif44, been pulling my hair out trying to get my mini to idle smooth, and with your advice on getting the jet flush first then turning mixture screw two turns clockwise, it worked fantastically, thank you so much 👍👍top bloke 👍

Excellent videos detailed and comprehensive, thank you

Brilliant. Thanks very much again. Terrific work.

Great videos and great looking car! I worked in a shop that remanufactured carbs back when I was in college. Did a lot of SUs, they are simple and very effective carbs once you know how to work on them. One other option for tuning is to get the O2 sensor. I have a predator carburetor on one of mine and I use an O2 sensor to dial it in.

Very well made video, very informative and very useful.

Right on time! I'm getting rid of banana Weber carb from my 1968 Volvo 122 and putting back a pair of SU HS6. Thanks a lot for the video

Without a doubt, the most well explained video I have ever watched. Very concise and interesting.

Really nicely done, much thanks. Will apply to my new (old) MGB race car.

Having some SU woes rebuilding a Rover 2200TC. Nice concise information here. Thank you.

Congratulation with the 30.000 subs. 👍

Brilliant video many thanks

Fantastic SU series from AEM meter install to this Part 2 tuning. Would have been good to see the plotting of the AFR graph again, comparing the initial data obtained with idle, 1st , 2nd , 3rd, 4th, cruise and WOT to what you have now. Thanks for sharing your knowledge and putting together the videos, i also really enjoy your teaching technique.

Thank you for a most useful video

Great explanation. Your Engish is good too Thank you!!

Great video

some great info here. thanks.

Superb explanations 👍

Very interesting. I have never heard of the colouttune method before. See through spark plugs.. now that’s a look :) Did you datalog after the changes to compare to how it was previously? It always amazes me the trouble you go to in order to share your knowledge, in this case going through 4 different methods and all for free on KZfaq. Thanks again Steve.

Really enjoying all the video's on the mini as I'm just finishing my 1330 build with a HIF44. Could you share the AFR datalog after the changes? That way I can see what it should look like. Thanks for the interesting and detailed videos/lessons!

Excellent

I used the exhaust gas Analyzer for Emissions testing in Canada 🇨🇦 works great for Diagnostic purposes

I’m in the process of doing this now. Thanks for the information.

I recognise that bridge. It is at the edge of Oudenaarde and Kruisem ,pretty close to where I live. Wat een kleine wereld.

I am running out of paper taking notes. Thanks again!

Hi, this is an excellent series of videos, thank so much, I am learning heaps. I have bought the same AFR you have but my mini has twin 1 1/2 HS4’s, what method should I use set the idle mixture screws?

I have a 61' Metropolitan that has dual SU's on it and am looking at getting a Colortune to help adjust the carbs since it seems to be running rich, but have read on a couple of forums that ethanol fuel can have an effect on how well it works. Since I am in the US and we have ethanol fuel my question is have you seen issues with it. Thanks for your video's. They are really informative.

Excellent waiting for those videos... please in all carburetors when screw clockwise the mixture became rich?

Super erklärt!

Excellent video. If when tuning duel su carbs with these methods, is the use of an air balance gauge between the two carbs still needed ?

Great video. Very instructive. Did you get the plots after the tuning, to see the difference?

Interesting. I've been trying to get my MGB tuned running duel HIF4s and the idle has been around 11.9:1 to 12.4:1 but obviously rich on the plugs. I will have to see if raising it to 13:1 to 13.4:1 helps. My only concern is I am not running a stock engine but modified high compression with a cam. About 9.5:1 or 10:1. This video does help as I have the same AFR gauge. Thanks for the great info. :)

Excellent! Made to look straightforward when done in the right sequence. One question ... only necessary to add the air filter in the final test on the road, not during the carb set up procedure?

Thanks! Fantastic videos. After having a lot of trouble and having my twin SU HIF 6’s removed many times I followed your basic tips and vrooom. My Rover SD1 3500 v8 started right up and super great. However: after a quite hard ride with 3-5.000 rpm and full throttle plus a lot of heat both carbs spit out fuel from the overflow pipes. Why? Both needle valves are new and floats adjusted 1 mm from bottom plane when upside/down. Any ideas? Best regards - Peter Lundorf Denmark

Thank you very informative, I have triple SU's so a bit more difficult. I don't really find the colortune very accurate, the colour tends to fluctuate and is a bit confusing.

Another fabulous video! Keep on ;) How much afr do tou have on road with quick opening? What about going to a richer needle?

Well made, my compliments. Is your in car rev counter a little bit off? Idle rpm seems around 500?

Very good information...I have a question, i have a Stromberg 175cd made in germany (it has a red cap) of my mercedes w123 of 1977, How can i remove the needle? i need remove it because it isn't vertical. I removed the side screw from the piston, and now i don't know what to do. So much thanks for your videos, greetings from Chile.

Thank you very much for the excellent information. I just have a question, in one of the videos, I saw you placed O2 sensor at the end of the exhaust and measured the voltage with an oscilloscope. I know it was a narrowband O2, but I wonder if it is possible to use wideband at the end of the exhaust to tune the carburettor? I believe that the readings there are a little bit different, probably more O2.

Many thanks for this as I am currently adjusting my carb on an ADO 16 Princess Vanden Plas. You mentioned the Colourtune changed colour during acceleration so should the correct colour reading be at idle or at higher revs? Cheers.

Thankyou

Very interesting video - is there much difference when it comes to tuning with an AFR with dcoe carbs?

I was looking through your channel and have a question. Is there anything you can't do? 🙂 You are Man with many talents. Regarding tuning a hif44 carb, I am following your video to install a AFR Guage. Getting really frustrated with the tunning. I either get plugs with black soot or bone while, never the rusty reddish color. My question is do you recommend using petrol without ethanol for mini?

Great video. Any advice for high altitudes? I'm going on a rally in South America which gets up to 15,800 feet. I have a 1967 Volvo Amazon with twin SU HS6 carburetors, with KD needles. I currently live at 1200 feet altitude.

Fantastic video. You are awesome. I have a very close set up in the engine as yours, but my car does not sound nearly as smooth as yours. If I record it and send it to you, would you be able to tell me what may be the issue? I will order the needle and spring similar to what you did on this video and see the effect. I have very low power in 3, 4, 5th gear, so I may benefit from your changes. Here is my engine spec : * Head: KAD 12G940 ROAD100 CYLINDER HEAD * Cam: KAD100 Camshaft and single HIF44 * Carburetor: HIF44 BDK (current) * Lightweight flywheel * Pre verto clutch - performance clutch * 1275 Metro block bore to 1310 * 5 speed trans.

Hi, thanks for very good videos. Where do you have the sensor for the AFR ? I have mine where the gearstick comes up. The manufacture say 66” from the head. My dial is all over the place. I cant get i så firm as you. My engine is total rebuilt, bore, valve etc.

👍

Personal I found you can tune the carb needles with a file, if your serious about tuning A series engine, you will need a heated inlet manifold the su will start to ice over without one

I have a question, I have a matched pair of HS2 carbs that I'm thinking of rebuilding. They're off an MG 1100 originally (AUD 69), and the SU catalogue says the left hand carb is fitted with a 4.5 ounce spring, but the right hand carb only should have a 2.5 ounce spring. What's the reason for mismatching them like this?

What were the AFR readings while cruising on the open road at constant throttle ? On the highway at speed for example.

Hola. Necesito un consejo. Para mantener un régimen de aproximadamente 4000 rpm constante, ¿es conveniente un resorte mas pesado y corto o mas largo y blando. No entiendo lo del cambio de resorte.

In the video you say under load it would run richer. Why is that? 27:00 Would 2k rpm cruise in neutral be different from 2k rpm under load in terms of AFR?

The graph you shown with the needles on, is this a web site. Could you say which it is?

Please can you tell me where are you buying the Su Parts.

Did you use the yellow spring in the end or back to the 4.5oz ? You could have used the red spring and used a thicker oil like 20w/50 in the dash pot. Very informative thank.

I would think the oil in your damper is still to thin. Even standing still the mixture should richen with the opening of the throttle.

Great video. What is the richest so lowest AFR you see once happy with tune on WOT? Mine is 14ish on cruse but will drop to a low as 10 briefly on WOT before coming back to around 11.5 to 12 is this normal or do you think I need a weaker spring or needle? Thanks

What causes run on or diesel in?

how to read spark plugs on a classic mini next xD

That engine sounds like a cat purring.

Mr. Kelvin isn't taught in the U.S. highschools. To learn chemistry, you have to pay many thousands of dollars for university. What Americans know about science is pathetic. I hope we get universal education and healthcare soon. Thanks for showing the sparklætor, it was very cool.

Adjust your steering wheel, not straight... 😁

Excellent