Re: Float Stuck ???or Ice Building Up In The Carb Somehow???
I think elmo is right!
On a hot, humid, day you can see moisture collecting at the top of 4 barrel carb on a V-8 auto engine.
A method to warm the carb as he suggested, may be your only option...and considering how short your ride is, it may not be practical. It's just too COLD!
I would try removing the Dellorto and putting the kit carb on and see what happens. The kit carb is so primitive that it may work fine.