Mercury - Starter Motor Assembly FourStroke 40-60 HP Series Marine-Grade Steel 893888T. Overview. There's a certain comfort that comes from a motor that answers the key without hesitation. When you're running a forty to sixty horsepower Mercury FourStroke, a dependable starter becomes the heartbeat of every trip-whether you're sliding away from the dock before sunrise or easing back through a quiet marina at the end of the day. A good starter gives you that confident, familiar rhythm. You trust