Sierra 18-6415 Yamaha Outboard StarterSierra high-quality marine starters are sealed to prevent water intrusion and corrosion. They are assembled using high-quality corrosive resistant materials for longevity. 9 Tooth Drive Gear; Use With: 18-56006 Brush Holder AssemblyInterchangeable with: Arco; 3428; Hitachi; S114-552; S114-660; Mallory; 9-15023; Yamaha Outboard; 6N7-81800-10-00;