I hardly think the valve job caused this icing up. but since you have more vacuum with good valves it might be more noticeable , maybe?? this happens because the air is forced through the venture of the carb and looses pressure and the air speeds up. this causes a drop in temperature and cause the moisture in the air to freeze. all carburators do this and is noticeable on the updraft carbs. if it has a carb it will have a cooling effect. its not just one make or type of tractors , they ALL do that. I have seen the carb get ice on it in july. this icing is called the "venture effect" perfectly normal . don't use it at wide open throttle till the engine warms up.
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