Mercury - Starter Motor 25 HP Four-Stroke Series Marine-Grade Steel 893886T. Overview. There's something reassuring about turning the key and hearing your engine jump to life without hesitation. On a small four-stroke like a 25 horsepower Mercury, a dependable starter motor isn't just a convenience-it's the heartbeat of your day on the water. Whether you're setting crab traps at sunrise or easing across the lake with the family, that crisp, confident start sets the tone. This Mercury Marine part