ARCO Marine Mercury/Mariner Outboard Starter - 8 Tooth [5392]Mercury Mariner Outboard Starter 8 Tooth The outboard starter will fit Mercury Mariner, 100 125 HP Inline 4 cyl; 80 HP Jet, 8 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