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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MG Y Type - YT Carburettor Jet Needles

My YT has been running rich ever since I purchased it many years ago. I note that needle size on my carbs is ES, which according to theSU data sheet is suitable for the TC & TD. I would appreciate any advice on the correct needle size to get a weaker mixture. (Size AP?).

I note the YA & YB have different needle sizes

My carbs were reconditioned by Burlen some years ago.

Many thanks

Anil Koshti
Anil Koshti

In our YT, I use the "lean" YT needle & mount it around 0.020" below the dashpot face.

Every engine is different - you will need to experiment a little unless you get it setup on a rolling road.

Cheers

Tony Slattery
Black Mountain
Australia
A L SLATTERY

Many thanks Tony. I shall get the weaker needle and experiment before using Colortune to check whether it is running ok.

Best wishes

Anil
Anil Koshti

Keep in mind the Colortune will only tell you the mixture at idle, only a gas meter will indicate mixture while on a rolling road or actually driving at various RPM.

Tony
A L SLATTERY

Anul

Check out http://www.mg-cars.org.uk/imgytr/techdata.shtml#SU%20Carburettors and download the original SU recomendations for needle sizes.

Paul
Paul Barrow

Many thanks for your help Tony & Paul. I have ordered the weaker needles AP and will try them out as soon as they arrive. Will check plug colours when driven over a few miles.

Best wishes

Anil Koshti

Devon, UK
Anil Koshti

This thread was discussed between 07/09/2015 and 08/09/2015

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