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RE: fixed leaky carbs - and strange power throb

To: spitfires@autox.team.net
Subject: RE: fixed leaky carbs - and strange power throb
From: "James Carruthers" <jcarruthers@freenet.co.uk>
Date: Tue, 16 Oct 2001 10:21:57 +0100
Checked my needles - they're AAU needles. The springs - what springs are we 
talking about? I only took notice of the giant springs in the dash pot (im 
still not sure if Im getting these names right). But thinking about it now the 
springs above the needles are probably the ones you are talking about. If I 
remember correctly - I may have just made them up. I didnt note down the colour 
of them. I did think it strange that the big ones were just grey when I was 
expecting colour. Ill look and see the smaller springs tonight - if they exist 
that it....


Where abouts are Moss in South London? Luckily Im in Bromley - so it shouldnt 
be too far away. Im guessing they do needles and springs too?






James



---- Message from "Catchpole, Pat" <Pat.Catchpole@ntc-europe.co.uk> at Tue, 16 
Oct 2001 09:36:10 +0100 ------
>James
>
>Hopefully you managed to check the needles in the carbs last night and found
>that they are ABT (standard).  For use with K&Ns a good starting point is to
>use AAQ needles.  These have the same diameter when at idle, but get thinner
>as the piston / needle rises at higher revs, thus allowing more fuel to
>flow.  You will also have to change the damper springs inside the carb body
>to stiffer ones (red {4.5 oz} to yellow {8 oz} dot).  This is to give a
>stable idle condition and to prevent the needle rising too rapidly during
>acceleration.
>
>This set up worked great on my car which also had a full sport exhaust.  A
>standard exhaust will be more restrictive to airflow, so you may want a
>slightly leaner needle such as AAT.
>
>You will need to visit a carb specialist to get these needles I think, or
>somewhere like Moss in South London who specialise in Triumph tuning parts.
>
>Hope this is useful, let me know how you get on.
>
>Pat
>
>> -----Original Message-----
>> From:        James Carruthers [SMTP:jcarruthers@freenet.co.uk]
>> Sent:        Monday, October 15, 2001 4:26 PM
>> To:  Pat Catchpole
>> Subject:     RE: fixed leaky carbs - and strange power throb
>> 
>> OK. Ill wait until I can do it properly. Ill take the K&N carbs apart when
>> I get home and see what the needles are. And Ill check out everything else
>> too.
>> 
>> James

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