Here's the question: What's wrong with my ditbike?

A week ago, I went out riding after we got a bunch of rain. The trails we ride on always have puddles, but they were full 3 foot ponds after all the rain. So we were flying through them on the way out and had no problems. Just got to keep your speed up and you can make it through these things with no problems. Well, on the way home, we had to hit the same ponds and on the first one, I hit a rut and my bike stops short. I bailed because I was going about 20mph and if I stayed on, I was justing going to fall in the water. By bailing, at least I could stay dry. Staying dry didn't work because my dirt bike sunk and stalled out when it sucked the water into the airbox. I had to go into the water and get it out, and push it back to the truck. It was quite the workout.

So the dumb thing won't start. Here comes the guessing game. I changed the plug and it still won't show any life. What else can go wrong with a two-stroke that would prevent it from starting?

Thanks guys.