carbs

[John Mason]

It sound like you may have a flat spot on the carb. After you have started the engine and it has warmed up try opening the carb up not with the accelerator pedal but with the linkage where it joins the carb. Do it very slowly and see if it will rev faster then. You may get a splutter to the engine but just shut it down and try again a few times and see it it will get past this flat spot. If it does get past and revs the engine it has proved it is a flat spot (air/petrol mix not quite right) This is corrected with the air mixture screw on the car. I am not familiar with big sevens so do not know what carb is fitted. If you are not familiar with setting up carbs this can be tricky and best left to somebody with the knowledge.

The Cornwall Austin Seven Club have a good thing on there site about carburettors for the Austin Big Seven.

John Mason