I have a 1941 Chevrolet 1.5 ton military truck that has about a 1955 235 engine in it. The Carburator is a Rochester Model B. The truck sat idle for some time and the carburator was doing bad things when I started it. So, I removed it and cleaned it up, put in a new needle valve and gaskets, carefully set the float level and drop and re-installed it. I am using fresh gasoline from a can on the fender and an electric fuel pump. The truck starts OK and seems to idle reasonably well - the idle does respond to adjustments to changes to the mixture screw. The problem is that when the engine is running faster, maybe 2000 or better RPM, with steady throttle, it seems to cut out or hesitate. But, if I pull out the choke just a little bit it clears up and runs fine. Anyone have any experience with this simple old carburator and why it might require some choke to get enough fuel? Sid
