Well, I haven't personally been under water, just my friend. I was there though and it isn't fun. My heart almost stopped when I saw the poor snowmobile sink into the depths of the icy cold water. It was only like 4 feet deep, just the top of the winshield showed. When it went down, water got on the belt, it reved up, then sputtered away and died as the water choked the motor for air and took its life. We got it hauled out of there, around all the ice chunks, freezing cold. Then we got it home and were frozen, then started working on it. Just cleaned out the carbs, got new gas and oil, and drained the engine via the plug on the bottom. It started up right away but sputtered for a while to begin with. That was the first time we had had it out that winter and it ran the rest of the winter just fine.
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