It won't start because it's flooded.
-Drain the airbox via the tube that hangs down under the bike.
-Take out the air filter and let the thing air out for a bit.
-Remove the spark plug and turn the engine over a few times to expel what might be in the chamber
-Check your oil level.
-Pull the oil fill cap and see if it smells like gas. (If it does, drain and refill oil)
Put it all back together and enjoy