Originally posted by simso
as far as running backwards are you sure, the reasdn I say this is because your stern drive legs that you attach to the engines have a lever which modifys the leg to spin left or right not the engine.
On larger boats with 2 engines, they have one rotate 'backwards' of the other. I assume this is to offset the rotational forces from the engine and drive shafts. These setups usually don't use stern drives but prop shafts through the bottom of the hull.