With an SU you should be able to weaken the mixture right off to stalling
point, the float level is not as important as jet/needle size.
Leaky throttle shafts would require *richer* needles to compensate, not
weaker.
Are you sure you have the right jets? There are two sizes, .090 and .100.
The smaller is used on the 4-cyl MGB, for example, and the larger on the V8.
PaulH.
----- Original Message -----
From: Kevin Sullivan <kevins@khoral.com>
To: <mgs@autox.team.net>
Sent: Friday, March 17, 2000 6:45 PM
Subject: SU H4 float height
>
> Here's a post that's not about BMW and Rover :)
>
> I know how I'm _supposed_ to set the float height (7/16" bar method), but
> that is not working correctly. I'm running _way_ too rich. New correctly
> sized needles (AO) and jets (I measured them, dial calipers are cool!) New
> throttle shafts nicely not letting in extra air. The carbs are the
> correct carbs for the engine. The needles that were in it originally were
> incorrect and it didn't run too well, _much_ too lean at high speed
> cruise, these things were _huge_, and mismatched to boot! The AO needles
> are the lean spec for the MGA 1600, since I'm at 5000 feet altitude. They
> are much richer than the needles that were in there. The PO may have put
> in superlean needles to compensate for the old leaky throttle shafts? No
> fuel in the floats, so they should be OK. The float needles are closing
> fine. Either the floats are floating at the wrong level or the fuel's
> getting in some other way, perhaps between the jet and the jet bearing.
> If I remove the dashpot covers and look into the jets, how far down should
> the fuel level be?
>
> Let's see -- what else do you need to know? Yes, of course I drove the A
> in to work today, it's beautiful outside. And I'm wearing my green MG Car
> Company t-shirt.
>
> --
> Kevin Sullivan kevins@khoral.com
> Khoral Research Inc. www.khoral.com/staff/kevins/mgstuff
> Albuquerque NM USA
>
> 1960 MGA "Baby"
> 1957 Magnette ZB "Pup"
> 1959 Magnette ZB "P2"
>
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