http://www.theautoist.com/weber_carb.htm
On 6/25/05, Bill Miller (LBC's) <lbcs@earthlink.net> wrote:
> Sorry for the cross-list posts, but since this carb is common to both
> platforms, I figure there must be an expert out there willing to tell me
> what is going on.
>
> I have a '77 MGB that is my daily driver. It is equipped with said Weber
> carb. This car starts up perfectly, idles perfectly, and runs at speed
> perfectly. However it seems to "load up" at between 100-2500 rpm. What I
> mean by that is that if I drive normally and come to a stop light, when I
> take off, it seems to miss like fouled plugs until 2500 rpm, then it clears
> up and runs like a scared rabbit. The engine, an 1800, has a standard head,
> desmogged, slightly bored out, new cam, pretty much everything new on the
> engine in the last 10K miles.
>
> To add to the mystery (to me) is the fact if I keep my foot out of it and
> accelerate very slowly, this miss is gone or almost gone. If I accelerate
> quickly, it is bad until 2500 RPM. Plug color is good, plugs are fairly
> new, tail pipe inside color shows it may be slightly rich. Good gas
> mileage.
>
> I thought it may be fuel pressure. I have a Holley regulator and gauge set
> at 1-1/2 to 2 PSI.
>
> I'll be the first to admit I know little about this carb or webers in
> general. It was on the car when I bought it. I am very seriously thinking
> getting a set of SU's. At least I know those.
>
> Another part of the puzzle that may help you experts. After the car is hot,
> I have to start it holding the accelerator down, but again, it usually
> starts on the second turn over.
>
> Any ideas? This thing does not appear to have mixture screws anywhere that
> I can find. How are you supposed to adjust it?
>
> Thanks,
> Bill Miller
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