Screw the bowl drain back in. Remove the larger incoming fuel line that goes from tank to carb and put it into the bottle. Now you will open the petcock a little bit slowly. If you never see fuel come out of the tank, thru that hose, then your screens on the petcock may be clogged.
If the motor didn't drop in the drink, start with the simple stuff that's likely to clog, the air, water, fuel and oil filters. If water refuses to spray from the cooling system's discharge hole at the back of the engine, run a stiff wire into the cooling water discharge tube, to remove items that may clog the hole, a common location for a clog.