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Just re building a set of TR4 carburettors and they are fitted with needles which have 369 on the stem. All the literature in Moss and Rimmers says that the  needles should be SM as standard, RH for rich, and SL for lean. Is this a new identification system and do my needles conform to some earlier system or have I got incorrect needles. Any ideas??

Cheers, Ralph.

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Whilst the experts turn up to help you. 

Does this add to the mix ?

https://mgaguru.com/mgtech/carbs/pdf/ba-su_needles.pdf

 

looks like 369 could be a becks arnley SM equivalents 

Edited by Hamish
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Well done that man. My question answered in 10 minutes. The carbs indeed came off an American import, but I didn`t know anyone other than SU ever made needles and I had never heard of Becks Arnley. At least I now know that I don`t have to buy new needles.

Many thanks, Ralph

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