Cometic Top End Gasket Kit for Yamaha 77 mm Stock Engines (C3695)

The Cometic C3695 Top End Gasket Kit is designed for Yamaha 4-stroke engines using a 77 mm stock bore. This complete kit includes the correct base gasket, head gasket, cylinder O-rings, and other top-end-specific O-rings or seals required for top-end removal and reassembly. It provides a convenient solution for servicing the engine while helping ensure dependable sealing throughout the top-end assembly.
Cometic uses a multi-layer steel (MLS) head gasket construction with embossed outer layers and a Viton rubber coating. This design promotes even torque distribution across the gasket sealing surface, helping reduce bore distortion and support improved piston ring sealing. The gasket construction is engineered for the demands of high-output 4-stroke naturally aspirated and boosted machines, including engines operating under high horsepower and cylinder pressure.
The Cometic EST (Extreme Sealing Technology) design features embossed stainless steel head, base, and rocker gaskets covered with a proprietary rubber sealing material. The head gasket material helps draw heat away from the combustion ring and distribute it evenly across the gasket surface, reducing hot spots and helping minimize the risk of gasket failure. Manufactured in the USA, the Cometic C3695 delivers application-specific components for a reliable Yamaha top-end rebuild.

Features:

• Application: Designed for Yamaha 4-stroke engines with a 77 mm stock bore

• Complete kit: Includes base gasket, head gasket, cylinder O-rings, and additional top-end seals

• MLS construction: Promotes even torque loading and helps reduce bore distortion

• Viton coating: Provides a durable sealing surface for demanding engine applications

• EST technology: Uses embossed stainless steel gaskets with proprietary rubber sealing material

• Heat management: Helps distribute combustion heat evenly across the gasket surface

• Performance design: Suitable for high-output naturally aspirated and boosted 4-stroke engines

• Manufacturing: Made in the USA

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