Just a guess:
Did you check the fuel line between front and rear carbs? does petrol
split equally between the two carbs? If the line between the two is
obstructed, the rear carbs will get less petrol, and the front ones will
be flooded, won't they? And do your floats work well?
Tell us when you find a solution so we all know.
Max
> 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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