On Mon, 15 Dec 1997, Larry A Hoy wrote:
> Bill, when you fiddle with the mixture you need to start the car and run
> it until the carb is hot, the engine temperature should be in the normal
> range. Then turn the idle mixture screw all the way in, don't tighten
> it. Then screw it out, the engine should pick up RPM as you turn it out.
> As you continue to turn it out at some point the engine will lose RPM.
> Now you know the maximum and minimum setting. The object is to set the
> screw so the engine is at the maximum RPM at idle which will be somewhere
> in between the two maximum and minimum settings you have found. Once you
> have done this you will probably never have to mess with it again.
>
> After you have accomplished this you can use the idle speed adjustment
> screw to sthe the idle RPM. If you have a standard cam in your engine
> you should be able to set the idle somewhere between 700-900 RPM.
>
> Larry Hoy (MGB.Roadster@juno.com)
> Denver, CO USA
> 1969 MGB Roadster
> 1987 Jaguar XJ6 Vanden Plas
> ===============================
> On Mon, 15 Dec 1997 12:21:58 -0800 bill <pplusb@northlink.com> writes:
> >My '77 rdstr has a downdraft Weber.
> >At a stop, it may idle straight down to zero and stall, or it may hang
> >on to an idle for a short while before nose diving.
> >I've fiddled with mixture, although not too expertly, and have the idle
> >screw turned way up, to no avail.
> >This phenomenon can be more pronounced when cold.
> >I need help - anybody have any ideas??
> >
> >TIA
> >Bill
> >
>
When you adjust the carbs use a tach.What you want to see is the rpm's
when the drop off. You won't necessarly be able to hear the drop.
...Art
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