What is included Overall Length: Mercury change the alloy of the internals of the lower units but sales continued to suffer because of the previous problems. Merc orginally devloped Mariner for exports out side the US but they soon discovered americans wanted a cheaper outboard so the also sold them state side
The features wide even heat pattern, making shrinkwrapping easier. I had a Mariner 5 hp on a jon boat back in , and it was a Yamaha. Fit for Mariner 4 hp - hp from on-wards. I read this quite a few years ago and my memory probably is not exact but, this is the thrust of the article I read.