Do you have the automatic choke? I would be real suspicious
of that given these symptoms. Lack of oil in the damper would
cause some mild surging and some hesitation when opening the throttle,
but nothing as severe as what you describe.
Greg Rowe
>From: "Graziano, Michael" <michael.graziano@csfb.com>
>Reply-To: "Graziano, Michael" <michael.graziano@csfb.com>
>To: "'paul.meyer@key3media.com'" <paul.meyer@key3media.com>,
>spitfires@autox.team.net
>Subject: RE: LBC Carb question
>Date: Wed, 7 Mar 2001 17:49:09 -0000
>
>Paul,
>
>THe oil in the damper is purely to maintain contant depression (vacuum)
>during acceleration and deceleration. It prevents the damper from moving
>too quickly. I use ATF fluid. Any fluid of similar weight should do. You
>might want to change the washer inside the needle seat assembly. Remove it
>and take it to a hardware store. The washer doesn't come in any kits I've
>seen for the ZS.
>
>I would check the rubber diaphram thats under the hat of the carb for the
>idle issue. A small rip in the diaphram might cause idle RPM issues. I
>believe vacuum leaks could also be the culprit, as the leak can increase
>and
>decrease depending on the expansion and contraction of the metals. Check
>for a leak around the intake manifold, carb, and head. Use carb cleaner.
>If the engine RPM's change when spraying the cleaner near the joints,
>that's an indication of a leak. Just don't spray it near the venturi
>opening, as that will defeat the purpose.
>
>The list will be sure to correct me if I've misstated anything.
>
>Michael
>
>-----Original Message-----
>From: paul.meyer@key3media.com [mailto:paul.meyer@key3media.com]
>Sent: Wednesday, March 07, 2001 12:15 PM
>To: spitfires@autox.team.net
>Subject: LBC Carb question
>
>
>
>I've been a lurker for some time, and thanks to all of you for your
>insights, as
>well as the terrific URL's.
>I have a binder of info I've printed off the web as a result.
>I can't imagine how much harder it must have been to be an LBC fan before
>the
>web.
>
>My '77 Spit is not roadable, and will hopefully be so by spring.
>
>I have some carburetor questions. The idle speeds up as the engine warms,
>from
>a feeble 650 or so at cold to about 2400 when hot.
>I cleaned the single CD4 carb up with spray cleaner and that helped, but
>it's
>not cured.
>I got the Haynes manual last week, and noticed they put 3-way oil in the
>damper
>- looks like the stuff from the hardware store. Is it? or is there some
>special
>type?
>Could low oil in the damper (mine's bone dry) cause or contribute to this
>problem? And what does the oil do?
>I bought some 3-way oil, but I'm leery of touching the carb. Any advice
>is
>appreciated.
>
>Regards,
>
>Paul Meyer
>'77 Spitifire (Charity) she was free.
>Gift horse comments not appreciated, but fully understood.
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