Yamaha 646-11181-01-00 – Gasket, Cyl Head 1

Yamaha 646-11181-01-00 – Gasket, Cyl Head 1

Precision-Sealed OEM Head Gasket for Yamaha Outboards

The Yamaha 646-11181-01-00 – Gasket, cyl head 1 is an original factory-made head gasket designed to provide a secure, leak-proof seal between your outboard’s cylinder head and engine block. Built to Yamaha’s strict tolerances, this gasket ensures proper compression and coolant flow while preventing oil and fuel leaks during operation.

Whether you're performing routine service or rebuilding your engine, this gasket is essential to keeping your motor running at factory-spec reliability.

Key Features

Genuine Yamaha OEM Part

Designed and tested specifically for Yamaha outboards.

Reliable Engine Sealing

Maintains consistent compression and fluid separation under high-pressure conditions.

Durable Multi-Layer Construction

Built to withstand temperature extremes, vibration, and internal combustion forces.

Perfect Fit and Seal

Engineered for precision placement and compatibility—no guesswork.

Ideal Use Cases

Head gasket replacement during engine overhaul

Resolving coolant or oil leaks between head and block

Ensuring a proper seal after cylinder head removal or valve service

Why It Matters

OEM Gaskets vs. Aftermarket

A blown or leaking head gasket can lead to overheating, power loss, and engine failure. Choosing the Yamaha 646-11181-01-00 – Gasket, cyl head 1 ensures you're using a factory-tested part that fits and performs exactly as your engine demands. It’s your best line of defense against long-term wear, fluid mixing, or compression loss.

Frequently Asked Questions

How do I know if my cylinder head gasket needs replacing?

Symptoms include white exhaust smoke, engine overheating, oil contamination, or loss of compression. Always inspect closely during major engine service.

Can I use an aftermarket head gasket instead?

While aftermarket options exist, they may not meet Yamaha’s specifications. OEM gaskets are preferred for accuracy, longevity, and optimal performance.

Is this gasket a single-use component?

Yes, it should always be replaced with a new one during any head removal. Reusing an old gasket can lead to poor sealing and engine damage.

This product has been superseded by: 6A1-11181-A1-00

Yamaha 6A1-11181-A1-00 - Gasket,cyl head 1