ARCO Marine Mercury/Mariner Outboard Starter - 10 Tooth [5375]Mercury Mariner Outboard Starter 10 Tooth The outboard starter will fit Mercury Mariner, 50 90 HP 65 HP Jet, and 10 tooth drive gear. ARCO advises using a fully charged battery A weak battery can damage the starter and starter solenoid. And to also clean all connections A corroded connection creates resistance, lowering the amperage required for an efficient starting circuit. Features: Dynamically tested and packaged for out of the box performance