Mercury - Water Pump Repair Kit Cooling System Service Complete 7-Piece Kit 89981Q1. Overview. There's something reassuring about the steady, cool-running feel of a small four-stroke outboard. When it's maintained well, an 8 or 9.9 horsepower Mercury or Mariner has this quiet confidence to it the kind of motor you trust for long drifts, slow trolling passes, or exploring hidden stretches of shoreline. The Quicksilver 89981Q1 Water Pump Repair Kit keeps that confidence alive by restoring the hear