Description
The Gasket Genius thermostat cover gasket set fits Yamaha 25 HP, 30 HP, 40 HP, 50 HP, 200 HP, 225 HP and 250 HP outboard engines and includes 2x thermostat cover gasket. These gaskets seal the joint between the thermostat cover and the cylinder head, ensuring cooling water flows through the housing without leaking as the thermostat regulates engine operating temperature. Once a gasket in this set becomes worn, hardened or damaged, it can no longer hold a tight seal at the joint, allowing water leakage and a loss of control over engine operating temperature, which can lead the engine to run too hot or too cold. Fitting a new set whenever the thermostat is removed for servicing helps restore a proper seal.
Fits specified Yamaha models:
- Yamaha 25 HP outboard
- Yamaha 30 HP outboard
- Yamaha 40 HP outboard
- Yamaha 50 HP outboard
- Yamaha 200 HP outboard
- Yamaha 225 HP outboard
- Yamaha 250 HP outboard
Replaces part number:
- 61A-12414-A0-00








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