Sometimes I start my Oliver 66 and it runs pretty good, other times it barly runs at all. So after messing with the carb, which made no difference, I pulled the distributer cap and roter off to check my points. I hooked one of the spark plug wires over a stud that bolts the valve cover down, and rolled the engine over to see how much spark and gap the points had. When I rolled the engine over, IT STARTED AND RAN! With distributer cap off! It ran rough, but it set there running. ????? Even though it was a new cap, the spark was jumping across the terminals, and firing the spark plugs. Went to town and bought another distributer cap, and now it runs great!