Pat,
If it is indeed the throttle by-pass valve, you have a series CDSE carb,
specifically designed to meet exhaust emission standards. The valve limits
the manifold depression which occurs when the engine is in the over-run
condition. It (the valve) is preset and cannot be adjusted. If you
determine that that is what it is, (all of the emission devices are
assemblies externally mounted on the carb body), let me know and I'll send
you one -- for the price of postage.
Regards,
Ed Hamilton
-----Original Message-----
From: Roger Elliott <relliott@cjnetworks.com>
To: Bowen, Patrick A. RP2 <jak0pab@jak10.med.navy.mil>
Cc: Spitfires@autox.team.net <Spitfires@autox.team.net>
Date: Tuesday, April 20, 1999 12:02 AM
Subject: Re: ZS carb question!
>
>Pat,
>
>If the gasket with the button is the one I am thinking of - it is in the
>deceleration and by-pass valve. It is a a valve held to the carb by three
>screws and the unit is held together by two or three screws with a center
>longer screw that is used for adjusting it The long screw presses against
the
>button in the gasket.
>
>When I rebuilt the engine on the my 80 Spit several years ago - this
gasket
>was torn. The mechanic that specializes in British cars recommended just
>blocking it off. It hasn't caused any trouble since. My understanding is
that
>it helped keep the rpm from dropping off quite as fast when you let off the
>pedal. It helped lower emissions.
>
>What pin twisted off on the tool? If you are talking about the locating
pin,
>I think you can still use it. I just use a long 1/8" hex wrench and hold
the
>piston to keep it from turning. Make sure you are turning it the right
way. It
>should be the way to weaken the mixture - counter clockwise.
>
>Roger Elliott
>
>"Bowen, Patrick A. RP2" wrote:
>
>> Atwell and others,
>>
>> after closer examination I have found that my carb is actually off a '76
>> and has a manual choke. I dissassembles it and cleaned it thoroughly. I
>> even took off the parts that screw onto the side (sorry I am carb
>> illiterate) I am concerned though, on one of the pieces on the side of
the
>> carb it had a cloth like gasket that seemed to have some sort of button
on
>> it? That item ripped while being removed and a new one did not come with
>> the kit. What is this and how big of kimchee am I in now? also I have
>> the special tool to remove the needle, however when I tried to turn it it
>> twisted off the pin on my tool(yes I took out the nut down on the side)
So
>> I can not remove the needle, is this bad? I am fairly intimidated by
this
>> carb at this point in time (never done one before). Help! Thanks,
Patrick
>> Patrick Bowen
>> '79 Spitfire
>> Jacksonville FL
>
>
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