[Mgs] choke problem update with video

[Paul Hunt]

The choke cable lever and fast idle cams aren't moving far enough.  
Barely half of the cam is passing the fast idle screw whereas virtually 
the whole of the arc should, and it's not moving the jet lever down at all.

You probably need to move the inner down through its trunnion clamp to 
get more movement of the lever.  How far can you pull the dash control?  
Mine is a good 1 3/8".

You may need to alter the position of the choke lever on the shaft.  
When you have full travel pull it half-way and it should make a 
right-angle with the line of the cable.  If it's too low it can make the 
start of the pull hard and if it's too high you may not get enough travel.

See here https://www.mgb-stuff.org.uk/choke.htm#adjust2 for pictures of 
the lever at zero and max choke, and of the fast idle cam and jet lever 
with no choke, just at the start of enrichment, and full enrichment.

PaulH.

On 25/03/2026 01:09, dave northrup wrote:
>
> Check out this video: https://youtube.com/shorts/qw1SC_rSEdQ?feature=share
>
> Wife pulled out the choke while I was filming.  So the choke cable is 
> not the problem
>
> Clearly it’s the next step in the choke process.  What should I be 
> adjusting now?
>
> Thanks so much!!!
>
> Disclaimer: 18GB-U-H 24109  engine in an MGA.  That engine came with a 
> weber; I put these carbs on.
>
> I am having trouble – when I pull the choke knob it does not change 
> the choke mechanism.  What am I doing wrong?
>
>
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