Bob,
Your MGB has a ZS CD-175. A slightly smaller version of this carb, the
CD150, came stock on the RB Midgets and late Spitfires. Below is a
website that details the rebuilding of the water choke, which is poorly
explained in most of the manuals.
http://www.paulbunyan.net/~jasko/choke/
Most ofhten the tiny o-ring around the needle in the choke deteriorates.
When this happens, the carb will run rich no matter what you do.
Me? I switched to a pair of SU's on my midget, but that was more for a
performance gain.
Good luck!
-=Chris
Chris King
http://home.comcast.net/~kvcbk/
<-----Original Message----->
From: BCAH@aol.com
Sent: 9/18/2006 11:36:32 PM
To: spridgets@autox.team.net
Subject: Zenith Carb
OK all, I've got a quick question on Zenith carbs. A friend just bought
an
MGB but it has this strange carb on it! I know this is the Spridget list
but
I as wondering if anyone could shed some light on this running problem.
I
figure there might be an "A" series with this same set up. On the side
of
the single carb is the "choke" or enrichment assembly with a water hose
running
through it which heats up a bi-metalic coil which,in turn, slides a pin
through an arc of about 40 degrees.I can not see that it actually stops
any air
flow so it must richen up the mixture. So-------engine runs poorly when
cold,---hesitates when full throttle is applied and never really runs
all that
great when hot. It was 75 degrees today and this pin was all the way
against
the stop. Is that the rich position? Carb also has a wire which the PO
says is
a pre heat deal.This carb can not be all that bad , can it? Any
thoughts?
This is on a 1980 model. I am trying to fix something simple. Any Zenith
folks out there? TIA,---Bob C
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