Mercury - Mercruiser 50-863007A-1 Starter Assembly for Mercury - Mercruiser Engines Every marine technician knows that the starter motor assembly takes stored energy in the form of electricity, air, or even hydraulic power and converts it into a mechanical rotation. This action cranks the engine faster to the point where the engines ignition system kicks over. Marine starters are similar to those found in vehicles, but with two major differences Features stronger and more water-resistant seals a