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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