Mercury - Starter Motor Assembly Kit Electrical System Marine-Grade Construction 879150A85. Overview. There's a special kind of relief that washes over you when your engine fires instantly with that clean, confident spin. It sets the tone for the entire day on the water. A reliable starter isn't something you think about often-but when it falters, you feel it in your gut. This Mercury Marine starter motor assembly kit brings that trust back. It's built for boaters who want their outboard to resp