SU carburettor tuning - Part 1 - The Basics 

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Thank you, yes always set your ignition timing correct before adjusting the carbs. that is the start, then adjust the mixture on idle and listen to the engine, measure the AFR if you can and or use a colortune... or just listening to the engine. Once that is done you can retune your ignition with small changes as the burnrate of the fuel/air mixture might have changed and more or less advance is needed. I always adjust for the max advance on idle , but do not allow pinging of the engine. Everything hangs together and relates on an engine... Have a look on the video on adjusting the webers on acceleration and main circuit on my playlist for the webers. There you see what `i mean with the burn rate of fuel and how that relates to ignition advance

If I come across one I wil

Thank you kindly!

Yes i does much depending where its worn, if it leaks air through the axle then you are having a vacuum leak and it starts to run lean, in all cases it will result in a leaner mix

That is awesome Jason, Thanks for the comments

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You are so welcome

Coming tonight

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Thanks for the info! and that is a bit strange that the HS has it. What type do you have ?

@@D3Sshooter mine’s twin HS2 carbs on a 1275 A series engine.

I believe the HS2’s I have on my 74 Spitfire has them as well, however it’s not the stock setup. It originally had the single Zenith.

Mark's Mini Garage that is good to know. Thank you. I will need to remember that

Emma Jacobs thank you

Thanks for the comments, well that is something you need graph yourself based on the information in the SU needle catalogue.

@@D3Sshooter Ahh okay, It looked like an excel program so I thought it was something where you plug in the needle number and it plots it on a chart. Similar to the other link you had on the previous video. Thank you sir.

minimoe2008 , indeed you can use xl plugin the data snd add a grapht to excel in radarview

Thank you...

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Great suggestion! I have done the DCOE's

@@D3Sshooter Yes,the DCOE Weber's are a little different, but will do. Thanks for making the videos. I just finished watching those Weber's videos.

Just put it flush ( for an articulated needle) and make sure it points/leans in the correct direction ( either to the engine or airfilter, there is an etched mark on the birdge of carburetor)

@@D3Sshooter Thanks for that. Not sure what you mean by leans in correct direction though. If fitted correctly doesn't needle point straight down?

@@DavidUKesb David, the needle sits in an angle that is what I mean with a biased or leaning needle. That is only for those carbs with a biased needle ( spring inside the insert). The needle can lean forward or backward... most of the time its leaning towards the air intake side. So the needle does not sit straight. If yours does , then its not right or you have carburetor with a NONE biased needle and then it sits straight. In that case you will need to center the jet itself

@@D3Sshooter Many thanks. My needle is fixed which is why I was confused!.

@@DavidUKesb No problem, good luck