Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03) 180-300HP Shaft Hub: Features a 1"

Shaft Hub: Features a 1" (25mm) double-flat drive hub made from epoxy plastic for a secure fit

and other smooth

and this aftermarket part is a direct replacement for both

Do I need to replace the gaskets when I replace the thermostat

Our compatibility tables are extensive but may not cover every application

Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03) 180-300HP Shaft Hub: Features a 1"Product Details This Thermostat 143F (62C) Fits Yamaha 2 Stroke 9. 9 55 HP is an essential cooling system component designed for a wide range of Yamaha outboards from 19861997. It ensures your engine maintains the correct operating temperature for optimal performance and longevity. Compatible models include 9. 9 15 HP (19861995), C25 C30 (19901997), C40 C55 (19901997), and various CV models (19891990). It serves as a direct replacement for Yamaha part