Reply To: ’54 Fleetwin – wont run on low speed

[Don]

I am asssssuming that you removed that aluminum welch plug to expose that low speed mixing cavity….Needless to say, the engine is never going to idle without that installed, you will need a new one…
You have the lead shot, but did not show us where the empty hole is. Please post a picture, some of these holes are “vents” and are should not be plugged….
And yes, just because the engine seems to run on both cylinders at higher speeds does not mean it can’t drop a cylinder at lower speeds….I am assuming you have had the mag plate apart and inspected/replaced the coils, points etc…