Sierra 18-6963 Yamaha Outboard Starter Sierra replacement starter for Yamaha Outboards. Features: All joints enhanced to prevent entry of water/moisture into the motor body Painted surface to improve rust prevention capabilities Robust clutch gear spring engineered to increase performance Upgraded planetary seal to help prevent water intrusion Interchangeable with: Yamaha Outboard 6EM-81800-00-00 6EM-81800-01-00