No apologize necessary I wasn't trying to get on you about it, I just wanted to let you know one is good all post will show up in active topics. The 250x and 300ex had reverse someone correct me if im wrong, the early 400ex did not. It sounds like you probably dont have 250, if you can post some pictures of the engine someone here will be along that knows more about it. Also would it be possible to contact the previous owner to see what was all done to it but maybe they just bought it that way and thought they had a 300.