Thermostat – Fits Yamaha 4-Stroke 80-100HP (Replaces Yamaha 6D9-12411-00, Sierra 18-3639) Cummins verify your specific year against

verify your specific year against the OEM part number

as well as Sierra 18-7351

Hardware kits are also typically included

9-90 HP models manufactured between 1994 and 1996

engineered for durability and performance

Thermostat – Fits Yamaha 4-Stroke 80-100HP (Replaces Yamaha 6D9-12411-00, Sierra 18-3639) Cummins verify your specific year againstProduct 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.