COMETIC Gasket Set - 102 mm - Yamaha C7798-EST

Top-end gasket failure costs you performance and money. The COMETIC Gasket Set with EST (Extreme Sealing Technology) eliminates hot spots and bore distortion that rob power from high-output 4-stroke engines—whether naturally aspirated or boosted. With multi-layered steel construction and proprietary Viton rubber coating, this kit handles the cylinder pressures and heat cycles that stock gaskets simply cannot withstand.

Built for racers and serious builders who demand reliability under extreme conditions, this complete top-end kit includes everything needed for a full R&R: head gasket, base gasket, cylinder O-rings, and all additional seals. The MLS (multi-layered steel) design distributes torque load evenly across the sealing surface, promoting better piston ring seal and consistent performance lap after lap.

• Fits: Yamaha YZ/YZF models
• Bore size: 102 mm
• Multi-layered steel construction
• Viton rubber coating
• EST technology included
• Includes head, base, rocker gaskets
• Cylinder O-rings included
• MLS head gasket design
• Even heat dissipation
• Eliminates hot spots
• Reduces bore distortion
• Rated for forced induction
• U.S.A. manufactured
• Complete top-end kit
• Bolt-on installation