I had something sort of similar when I sunk mine there a couple weeks ago, but my problem was the letting off the throttle too fast from near or full power, and it stalled, once it stalled, i wasn't able to get it started again until i pulled it out, even then I had to crank it over for probably 30 seconds to blow all the water out of the exhaust. I verified afterward that I didn't have any water ingress into the intake tract. When i got home, i had a puddle probably the size of a silver dollar in the airbox, which may very well have been in there from previous rides.