Have a look at 'Spanners' and 'SU Carbs' on the web site below. Might help.
(or if that URL doesn't work try )
----- Original Message -----
From: James Nazarian Jr <James.Nazarian@Colorado.EDU>
To: British Sportscar Center <email@example.com>
Cc: James Nazarian Jr <James.Nazarian@Colorado.EDU>; <firstname.lastname@example.org>
Sent: Thursday, December 09, 1999 10:13 PM
Subject: Re: Problem starting
> I know that the choke is all wrong since the car won't idle on it in any
> position but off. I would love to figure out what I am doing wrong but I
> never get around to looking at it, and besides I don't know what I am
> looking for. The choke works to richen the mixture, but the fast idle
> part doesn't work the car just sputters and dies. Any simple thoughts on
> what is wrong, since we're on the topic.
> James Nazarian
> '71 B roadster
> '71 BGT rust free and burnt orange
> '74 BGT going by-by soon
> '63 Buick 215
> On Thu, 9 Dec 1999, British Sportscar Center wrote:
> > James,
> > Your "feathering the pedal" effectively partially opens your throttle.
> > fact that you have to do this tells me your fast-idle link to the choke
> > not adjusted properly.
> > Your "one pump halfway" does nothing but exercise the ligaments in your
> > ankle. There is no accelerator pump on SU carburetors so the movement of
> > pedal just moves a cable that opens a throttle plate.
> > Still, I guess exercise for the right ankle is good - it helps keep that
> > as limber as the one that operates the clutch...........
> > Lawrie
> > British Sportscar Center
> > ----- Original Message -----
> > From: James Nazarian Jr <James.Nazarian@Colorado.EDU>
> > To: <email@example.com>
> > Sent: Thursday, December 09, 1999 12:32 PM
> > Subject: Re: Problem starting
> > > My SUs on my 71 need to have the gas pumped while starting. Usually
> > > pump 1/2 way then feathering the pedal from 0 to 1/2 all while
> > > Usually takes literally 2 seconds to start, but without the gas it
> > > start in cold weather.