The smaller-horsepowered Continental carburetted engines (A-40 to O-300) will suffer carb ice more often than similarly-powered Lycoming engines due to the differences in their construction, and the attachment of the carb to to the engine. So don't put the carb heat to cold at 300 ft AGL on final approach in a C150
I don't know enough about Franklin engines of similar vintage to be able to make a comment.
Russ