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5 2-Stroke 1975–1986 47-89981Q1 For S/N 5595532 & Up 1 cylinder Mercury 6 HP 6 2-Stroke 1975–1986 47-89981Q1 For S/N 1916139 through 2529894 Mercury 7
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as well as Sierra 18-7351
Thermostat – Fits Yamaha 4-Stroke 80-100HP (Replaces Yamaha 6D9-12411-00, Sierra 18-3639) Cummins 5 2-Stroke 1975–1986 47-89981Q1 ForProduct Details This is a direct replacement Thermostat Fits Yamaha 4 Stroke 80 100HP (Replaces 6D9 12411 00), designed for reliable temperature regulation in Yamaha F100D, F100A, F100B, and F80A outboard models from 20052017. Maintaining the correct engine temperature is crucial for performance and fuel efficiency. It serves as a direct cross reference for Yamaha part number 6D9 12411 00 and Sierra part 18 3639. Designed for direct fit installation.
