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Hi Michael,
Sounds like fuel level in the front carb. Check that the valve is closing,
and check that the float level is set correctly
Guy
-----Original Message-----
From: spridgets-bounces+guy.weller=tiscali.co.uk@autox.team.net
[mailto:spridgets-bounces+guy.weller=tiscali.co.uk@autox.team.net]On Behalf
Of Michael Rowe
Sent: 07 May 2008 14:52
To: Spridget Chat Group
Cc: David Blackwell
Subject: [Spridgets] Two perfect cylinders?
All right all you mystery lovers. My "new" engine starts perfectly and runs
easily - on two cylinders, 3 and 4. Cylinders 1 and 2 are flooded out and
will not fire. At one point, cylinder 2 was firing enough to make the plug
sooty. Cylinder 1 was always wet with gas. Pretty much everything is
either new or cleaned and checked. Electronic ignition, new wires, rotor,
cap, coil plugs. Spark to all cylinders confirmed by inline checker.
Compression mid 170's on 1, 2, and 4, mid 160's on 3 (which is firing). The
same problem occurred with two different sets of carbs.
Here's the fun part. When the carbs were set at 12 flats down, plugging the
front carb caused a large increase in speed. Plugging the back carb caused
instant death. I leaned the front carb pretty much all the way to the top
because cylinders 1 and 2 were flooding. In that condition, I covered the
intake with my hand and absolutely nothing happened, as though there were no
airflow through the front carb at all. The vacuum felt very weak compared
to the rear carb. There does not appear to be anything wrong with the
butterfly. No evidence of leaking by an ether test at the gaskets, etc.
Later, I even stuck my finger in the manifold to see if there were a mouse
nest or something.
I am a complete newbie, but my mechanic/tutor has 30 years experience with
MGB's. We are baffled.
Michael Rowe
'74 Midget
Long Island, NY
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