Mid-Season Service Sale! • Up to 25% off Outboard Service Kits • Up to 26% off Outboard Oil Change Kits • Up to 10% off Gear Lube Kits • Up to 32% off PWC Service Kits • Up to 10% off PWC Oil Change Kits •

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Free Shipping Over $99*
Hassle-Free Returns
Support from Yamaha Parts Specialists
Free Shipping Over $99*
Hassle-Free Returns
Support from Yamaha Parts Specialists

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

Free Shipping over $99

Orders $99 or more ship free within the contiguous U.S.
May not apply to engines or oversized orders.

Shipping Policy

45-Day Hassle-Free Returns

Not the right fit? No problem. Send it back within 45 days—no questions, no hassle.

Return Policy

45-Day Hassle-Free Returns

Not the right fit? No problem. Send it back within 45 days—no questions, no hassle.

Return Policy

Expert Support When You Need It

We’re here to make your experience smooth, simple, and stress-free—so you can get back to doing what you love.

Talk to a Parts Expert

Expert Support When You Need It

We’re here to make your experience smooth, simple, and stress-free—so you can get back to doing what you love.

Talk to a Parts Expert

Yamaha Outboard Engine Thermostat Gaskets

The Yamaha Marine Outboard Thermostat Gasket is a working seal situated between the thermostat housing and the engine.

Keep your Yamaha outboard motor's cooling system running smooth and cool by replacing your Yamaha outboard thermostat gasket as neeeded.