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Been trying to set up the carbs (SU) on my 4a, seems to be running rich (whatever I do ) checked the needles it is fitted with BAE, so I changed them to standard TW

wouldn't run at all so put the BAE's back

I noticed the BAE needles are at least 10mm longer than the standard TW   why?

Any suggestions on leaner needles to use please?

 

Best regards Lee

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Are you sure that the problem are the needles?. In my TR4A (with TR4 H6 carburetors), I had the same problem and I found out that the issues were the choke arms that pull the jets out not going back to the fully closed position due to jet sticking to the seals and a faulty choke mechanism (some previous owner changed the way the choke opens), and air leak due to worn throttle spindles. I changed the throttle spindles, jet seals and repaired the choke mechanism and was pleased to see that, for the first time since I own this car, I had to enrich the mixture by unscrewing the jet adjustment nuts.

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The BAE needles are the sprung type, so you should not easily be able to switch to TW which is not sprung.

If you did manage it, there is a strong chance that the jet would not be centralised to the needle, which would explain the difficulty.

The profiles of the BAE & TW needles are very similar & one may be the sprung equivalent of the other.

Bob.

Edited by Lebro
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