Cometic Top End Gasket Kit for GasGas and Yamaha, 77 mm (C7905-EST)

The Cometic C7905-EST Top End Gasket Kit provides the essential gaskets and seals needed for reliable top-end reassembly on compatible GasGas and Yamaha engines. This complete kit includes the correct base gasket, head gasket, cylinder O-rings, rocker gasket, and other top-end-specific O-rings or seals required for removal and installation. Designed for 4-stroke applications, it supports today’s high-output naturally aspirated and boosted machines with dependable sealing performance.
The Cometic C7905-EST kit features Extreme Sealing Technology (EST), combining embossed stainless steel head, base, and rocker gaskets with a proprietary rubber coating. The multi-layer steel head gasket promotes even torque distribution across the sealing surface, helping reduce bore distortion and improve piston ring sealing. Its construction is engineered to withstand the high cylinder pressures and temperatures produced by high-horsepower engines.
The head gasket material helps draw heat away from the combustion ring and distribute it evenly across the gasket surface. This helps minimize hot spots and reduce the risk of gasket failure during demanding operation. With its application-specific components and performance-focused materials, the Cometic C7905-EST is a practical choice for professional engine builders, powersports technicians, and riders completing a top-end service. Made in the USA.

Features:

• Complete top-end gasket kit for compatible GasGas and Yamaha 4-stroke engines

• Includes base gasket, head gasket, cylinder O-rings, rocker gasket, and required top-end seals

• 77 mm application-specific gasket design

• MLS head gasket promotes even torque loading across the sealing surface

• Helps reduce bore distortion and support improved piston ring sealing

• EST construction uses embossed stainless steel gaskets with proprietary rubber coating

• Designed for high-output naturally aspirated and boosted engines

• Head gasket material helps dissipate heat evenly and reduce hot spots

• Made in the USA

Ships from Parts Unlimited.