You might like to have a look at a list of needles on the web site below -
select 'Spanners' and 'SU Needles'.
Is the shoulder on the needle flush with the base of the piston? Are you
sure the jets are fully up i.e. can you see them sticking up above the
bridge? have you tried ignoring the Colortune for the moment and just
monitored the revs as you wind both jets up and down (together)?
AUD405 should have AAE needles, if you have those and still can't get the
correct idle mixture then something else is wrong which ought to be sorted
before you go trying different needles.
PaulH.
----- Original Message -----
From: Dereck C <derex39@hotmail.com>
To: <mgs@autox.team.net>
Sent: Monday, August 28, 2000 6:04 PM
Subject: SU's running rich, leaner needles? 70 MGB
> Well I have searched the archives for most of the morning and have decided
> to go ahead and ask some questions.
>
> 1) What is the leaner needle for AUD405 SU's (moss catalog does not list
> one)?
>
> As you may recall I just rebuilt a 70 B engine. Basically I replaced
> everything balanced and bored .60 over, hotter reground cam, new aluminum
> standard head. In the recent past I was having a problem with not getting
> enough fuel (blocked jet tube was the culprit). Now I seem to have the
> opposite problem. I got my Colortune in the mail on Friday and gave it a
> try over the weekend. Long story short, I could not lean out the carbs -
> the jets are completely closed (adjusted up) and it still runs rich. BTW,
> the carbs where rebuilt as well.
>
> 2) What would cause rich mixture? Dashpot not fully seated (looks good
and
> falls with a click)? Float level too high (I can't adjust the plastic
> floats and they don't seem to leak)
>
> Thanks again,
>
> Dereck
>
> PS I'm on the digest, please respond directly.
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