I'm back to this post after way to long. I have continued fighting the carburetors sticking when encountering water issue since my last post back in 2011. I wanted to provide an update to the changes I've made with positive results but unfortunately I haven't been able to eliminate the issue completely. As a reminder I was having this happen to me with my old motor and my new motor. Now here is what I've replaced since my 2011 post. New stater, new coil, new intake boots, new air box design, new carburetor caps and cable for the TORS eliminator kit, new exhaust bushings including o-ring seals and springs. I also and to add to the mystery have installed a different set of stock carbs that a buddy gave me. A set of carbs I've seen in action dozens of times on my buddies quad and he never ever not even once had this issue! I've since rebuilt them including a new choke assembly and replaced the cross-over fuel line tube. I'm also using the slides and needles that came with the replacement carbs. Now people, even with all those changes I still to this day fight with the big question of why is this happening!
So my buddy sends me a link on Carb Icing:
Carburetor Icing, or carb icing, is an icing condition which can affect any carburetor under certain atmospheric conditions. Carburetor icing occurs when there is humid air, and the temperature drop in the venturi causes the water vapor to freeze. The ice will form on the surfaces of the carburetor throat, further restricting it. This may increase the Venturi effect initially, but eventually restricts airflow, perhaps even causing a complete blockage of air to the carburetor. The engine begins to run more rich as ice formation increases. Without intervention (carb heat or leaning) this can only continue until the mixture is outside of the "chemically correct" range for combustion. Icing may also cause jamming of the mechanical parts of the carburetor, such as the throttle.
Also here is a cool video of the icing in action: https://www.youtube.com/watch?v=IBjZHl7HscA
Any comments on this possible cause presented?