I have an OS 46AX that just about always starts backwards when it is cold (engine- not physical temperature). As a matter of fact, it will do this five or six times before it finally goes the right way. I am starting the engine by hand. If I use an electric starter, I don't have the problem. It doesn't backfire - I have to put my hand in front of or behind the prop to feel the wind to tell which direction it is turning. After the first flight of the day there are no more issues. What could it possibly be?