engine choked out by water, help!!

i wasriding my 2008 trx500 foreman today in a friends creeks and fell into a deep hole and the motor choked out. had to get it pulled out and would not re-start. no water got into the air cleaner box but i have a feeling water went up the exhaust at the angle the machine was in. i drained the oil and going to let it dry out overnight. any suggestions to what i should do before i try starting it again besides changing the oil and filter? i hope i didnt mess my motor up. thanks