I have a Commer Q2 with a Solex 40 FAI carb which has been standing for a few months. When I start it up either with or without choke it starts and runs fine. However it will not drive without the choke full on. If the choke is off then as soon as I open the throttle the engine dies. If the choke is full on then it will drive but is quite rough.
I have been told that this is due to too much air and have tried to adjust the mixture screw but to no avail. However someone else has suggested that it may be a fuel starvation problem. Any suggestions would be gratefully received.