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Mercury/Mariner 100-125 HP Inline 4-cyl; 80 HP Jet, 8-tooth drive gear ARCO 5392 Outboard Starter Mercury 50-66015-T, Mercury 50-66015-1, Mercury 50-66015-3, Mercury 50-893892T, and Sierra 18-5610 are the part numbers it replaces. For optimal corrosion protection, epoxy powder coating. The induction case of motor shafts is strong at the bearing surfaces for increased wear resistance. All armatures were put through their paces at 50 times their standard operating voltage (12V). Five different load levels to evaluate the performance of each starter motor. Before being packed, all starter motors must meet or exceed OEM specifications.
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8-tooth drive gear. Fits: Mercury/Mariner 100-125 hp Inline 4-cyl.; 80 hp Jet