In Reply to: ‘41 9N running rough, at cold start, then smoothes out. posted by Ron on October 02, 2024 at 21:16:56:
Perhaps your newer carb needs tweeking. Sounds a little lean to me. It takes more fuel to run a cold engine. Have you cleaned the fuel bowl and the filter screens in the fuel system? Electrical and ignition issues usually act up when everything has warmed up.