Sierra 18-6942 Permanent Magnet Marine Starter Motor for Yamaha Outboards

The Sierra 18-6942 is an all-new replacement starter motor engineered specifically for Yamaha 4-stroke outboard engines. Featuring a permanent magnet design, this starter delivers improved cranking torque and longer service life compared to conventional field-coil starters. Built to meet OEM specifications and match or exceed OEM output, it provides guaranteed, reliable starting performance in demanding marine conditions.

The armature is coated with high-temperature epoxy to protect and insulate windings against heat, moisture, and vibration — critical factors in the harsh marine environment. High-quality magnets and field coils provide superior starting torque, while double-sealed housings and premium brushes extend service life. The starter meets SAE J1171 and ISO 8846 marine-grade electrical standards.

Key Features:

• Permanent magnet design for increased torque and extended service life
• Meets OEM specifications and matches or exceeds OEM output
• High-temperature epoxy-coated armature for durability and insulation
• High-quality magnets and field coils for reliable starting torque
• Double-sealed housing to resist water intrusion and corrosion
• Premium brushes for long-lasting performance
• Meets SAE J1171 and ISO 8846 marine-grade standards
• 9-tooth starter drive, counterclockwise (CCW) rotation

OEM Cross-Reference Numbers:

• Yamaha: 69W-81800-00-00
• Hitachi: S114-682
• Arrowhead: 410-44074 / SHI0120
• Lester: 18444
• Quicksilver: 8M6007428

The Sierra 18-6942 is a direct-fit replacement that installs without modification, making it an ideal choice for restoring dependable engine starting on compatible Yamaha 4-stroke outboards.