Cometic Top End Gasket Kit for Yamaha 97 mm 4-Stroke Engines (C3813)

The Cometic C3813 Top End Gasket Kit is designed for Yamaha 4-stroke engines requiring a reliable top-end rebuild solution. This comprehensive kit includes the correct base gasket, head gasket, cylinder O-rings, and additional top-end-specific O-rings or seals needed for removal and reinstallation of the top end. It provides the sealing components necessary to support proper engine assembly and dependable performance in high-output applications.
The MLS head gasket uses a multi-layered steel 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 a better piston ring seal for improved power potential. Cometic engineered these gaskets for modern 4-stroke naturally aspirated and boosted machines operating under high cylinder pressure.
Cometic Extreme Sealing Technology, or EST, combines embossed stainless steel head, base, and rocker gaskets with a proprietary rubber covering. 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. The C3813 kit is manufactured in the USA and offers a precise, performance-focused option for Yamaha top-end service and engine rebuilding.

Features:

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

• MLS head gasket construction promotes even torque loading and helps reduce bore distortion

• Viton rubber coating enhances sealing performance across the gasket surface

• Designed for high-output 4-stroke naturally aspirated and boosted engines

• EST construction uses embossed stainless steel head, base, and rocker gaskets

• Heat-dissipating head gasket material helps reduce hot spots and gasket failure

• Made in the USA

Ships from Parts Unlimited.