[Mgs] Carbs still being nasty

[David Ambrose]

You probably have HS-2s. HS carbs have a separate float bowl assembly. 
HIF carbs have the float bowl integral with the carb body. I don't think 
those were ever fitted to MGAs.

If you don't already have one, get an SU tool kit. It will have a couple 
of pointers you can attach to the pistons which will let you sync the 
carbs. It will have a wrench for the mixture adjustments, and most 
importantly, it will have a small tool to center the needle on the HS 
carbs.

And, if you get totally frustrated with that MG, I will give it a good 
home. :-) Selling *my* '62 MGA is one of the few regrets I have.

If it's any consolation, my first encounter with those carbs was 
anything but encouraging. Sitting there at idle, the engine would rev up 
to 2000 RPM, then drop to 900, and keep repeating.

HTH,
Dave Ambrose


On 12/27/2016 12:52 PM, Clayton Kirkwood via Mgs wrote:
>
> I have no idea which kind of SU’s I have. This is on a 62A. How am I 
> to tell?
>
> *From:* PaulHunt73 [mailto:paulhunt73 at virginmedia.com]
> *Sent:* Tuesday, December 27, 2016 12:45 AM
> *To:* crk at godblessthe.us; mgs at autox.team.net
> *Subject:* Re: [Mgs] Carbs still being nasty
>
> OK, twin SUs then, but HS or HIF?
>
> Screw both the idle screws in until you can get it to idle, only then 
> can you really have any chance of adjusting the air-flow balance and 
> mixture.
>
> If you still have problems getting it to idle, perhaps the mixtures 
> are way out.  The starting point is to screw the jets up until the 
> top is flush with the bridge, then screw back down two full turns.  
> You will probably also need some enrichment from the choke.
>
> For air-flow balance yes when listening with a tube at the carb 
> intakes if one carb is quieter than the other the quieter one needs 
> the idle screw to be screwed in further until the sounds are as equal 
> as you can judge.  This should speed up the idle, so while doing that 
> the louder carb may well need its screw unscrewed a little to keep the 
> engine at a reasonable idle speed.
>
> Whilst you can adjust for air-flow balance while the engine is warming 
> you won't be able to adjust properly for mixture until the engine is 
> fully up to temperature.
>
> PaulH.
>
>     ----- Original Message -----
>
>     I can’t keep the engine running when tuning for both slow idle, it
>     dies as soon as I start it. I have had some success listening
>     through the rubber tube and there is significant difference. I
>     presume the intake which sounds weaker needs the idle raised??
>
>
>
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