It is normal to some extent because nothing can vaporize without drawing heat from somewhere. The whole theory of air conditioning is based on that. The worst temps for icing are in the 30 to 40 degree range normally. Extremely cold temps normally does not hold enough moisture to cause problems. Then we throw snow in the equasion and that up's the humidity of the air being pulled into carb so it can be a problem when colder. That 560 has a heat stove surrounding the intake where the carb bolts up to. The heat riser with the spring loaded valve is intended to direct the exhaust flow around that area. Problem is, those heat risers stick, burn out, spring fails and then biggest problem is carbon fills the internal passages around that intake inside. That requires splitting the manifold and cleaning them out. I sand blast them. Then, early 560's used a dual venturi which gave better economy but was really bad for carb icing so they switched to a single venturi. The best cure yet is to fabricate a stove around the muffler, pull heated warm air from outside of muffler and right into the air cleaner intake. Carbureted automobiles did that for many, many years. Not the exhaust mind you, don't want that, but a stove around outside of muffler. Other things work somewhat also. Just a shield along side of the hood to direct warm air on carb. Making sure thermostat is bringing engine up to temp. And, shut it down when warm just long enough to melt it and restart it. If you wait too long engine will cool too much. Adding gasoline anti freeze to gasoline will lower octane so don't want to get too carried away with that and it is not the moisture in the gasoline that is freezing anyway, it is the moisture in the air. Been a problem since carburetors were invented.
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