Mercury Outboard Starter – 9 ToothThe outboard starter will fit Mercury\/Mariner 40 HP, 50 HP, 60 HP 4-cyl, 4 Stroke, and 9-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 performanceNickel-coated and epoxy-painted to reduce corrosion Sealed to minimize water intrusionDesigned for long life and optimum performanceArmatures are tested to withstand 50 times operating voltages (12 volts)Warranty Information:When properly installed, all ARCO products are warrantied against defects in materials and workmanship for a period of 12 months for leisure use and 90 days for commercial or racing applications. Add an extra year of warranty to your rotating electric ARCO product (Tilt\/Trim Motors, Alternators, Outboard Starters, and Inboard Starters) when you register your product within 30 days of purchase. You can register your product by visiting arcomarine.com\/product-registrationReplaces:Mercury 50-859377TMercury 50-884044TMercury 50-888161TMercury 50-893888TThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.