The tail pipe will always be sooty with unleaded, it is the lead in leaded
that shows grey for a correct mixture. Stalling as a carb piston is lifted
is a symptom of weak mixture - only lift each by 1/32", by the way. You
should always be able to 'tune out' leaking throttle spindles at idle
(unless you can drive a coach and horses through the gap), but will have
other symptoms like a hesitant pickup with small throttle increases.
Setting up SUs is time consuming to do correctly, but rewarding when done.
You might like to have a look at my own info on the site below, select
'Spanners' and 'SU Carbs', but ignition, timing and valves need to be done
first.
PaulH.
http://www.mgb-stuff.org.uk
----- Original Message -----
From: <ahhclem@kcnet.com>
To: <mgs@autox.team.net>
Sent: Tuesday, April 04, 2000 3:19 AM
Subject: Intake leaks
> I have never been able to obtain a smooth idle on my 77B. No problems with
> road operation to 5,300 RPM, never had it higher. Two things I suspect: 1.
> Leaking carb.
> shafts (HIF4's) 2. Leaking manifold gasket. According to info. from this
> list the manifold gasket is on backwards, metal face to manifold. When
> either carb's piston is lifted during setup the engine slows almost to a
> stall and remains there until the piston is released. The miss is
irregular
> and the tail pipe sooty.
>
> Any advice is welcome
>
> TIA
> Rick Jennings
>
>
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