If your engine has a wet cylinder, you'll need to take some steps to dry it out. This is because water can cause serious damage to an engine, leading to corrosion and other problems.
The first step is to remove the spark plugs from the cylinder. Next, use a compressed air source to blow out any water that may be inside the cylinder. Be sure to aim the air stream at the bottom of the cylinder so that any water is blown out through the spark plug hole.
Once you've removed as much water as possible, you'll need to replace the spark plugs and then start the engine. The heat from the running engine will help evaporate any remaining water in the cylinders.