Thank heavens for this list!!
I did as suggested and now idle at 600rpm. My problem turns out to have
been that I used the wrong gasket when I re-assembled the bypass valve.
I mistakenly opened the valve when I was cleaning the carb and tore the
diaphragm (sp?) so I ordered another and it came with two gaskets. I
mistakenly used one of these between the valve and the carb thus
creating a large vacumn leak. Found the correct gasket in the pile of
leftovers and now all is well - or at least we are moving on to fuel:air
mixture tuning. I disassembled the plastic mixture screw too so I will
have to figure that out too.
Thanks for all the suggestions.
----- Original Message -----
From: Atwell Haines <carbuff@nac.net>
To: Gary Hutton <hutton@evansville.net>; Spitlist
<spitfires@autox.team.net>
Sent: Sunday, November 05, 2000 11:53 AM
Subject: Re: ZS CD carb overhaul
> At 11:32 AM 11/4/2000 -0600, Gary Hutton wrote:
>
> >My first try at rebuilding a ZS CD carb has resulted in a puzzling
> >problem for me. ...now it idles (!) at 2800 rpm with
> >no choking or pressure on the accelerator.
>
> Gary,
>
> The problem may be with the bypass/decel valve on the front side of
the carb.
>
> Try temporarily blanking it off with a solid gasket. If your idle
drops to
> normal, you've found the culprit.
>
> The Bentley manual has an adjustment procedure.
>
> Atwell Haines
> '79 Spitfire
> Succasunna, NJ USA
|