Mercedes-Benz: Solex 4A1 problems on W123 from 1977

Hi,

I own a W123-026 from 1977. It's a 250 sedan with a Solex 4A1 carburator.
Can anyone help me with adjusting this carburator?? The car runs idle pretty
well, but when I step on the throttle the car almost stalls, backfires and
more of that misery. Only when I push the throttle very slightly the car is
willing to drive without too much trouble. I already cleaned the carburator
and added new gaskets. Is it possible that a leakkage in the gasket of the
inletmanifold may cause these problems, or is it a problem of fuelsupply??

Can someone help me ??

Thanks,

René

>I step on the throttle the car almost stalls, backfires and 

Check the diaghragm-type accelerator pump; also, the air valve secondaries may
stick (top flap, metrering rods, throttle blades) because of warpage in the
layers of the carb body.

Do not overlook the possibility that your ignition secondary (coil, wores,
plugs) may be the problem.
Bill Ditmire
Ditmire Motorworks,Inc.
425 White Horse Pike
Absecon,NJ 08201
http://www.ditmire.com
609-641-3392