ARCO 5392 STARTER MERC/MARINER OUTBOARD 8 TOOTH 50-660153, 50-893892TARCO 5392 STARTER MERC MARINER OUTBOARD 8 TOOTH 50 660153, 50 893892T 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