Cometic C3635 Top End Gasket Kit Bore Honda - 79mm CRF250R

The Cometic C3635 is a complete top end gasket kit engineered for the Honda CRF250R with a 79mm bore. Covering model years 2018–2023, this kit supplies every gasket, O-ring, and seal required for a thorough top end removal and replacement, eliminating the hassle of sourcing individual components.

Kit Contents:

• MLS (Multi-Layer Steel) head gasket with embossed outer layers
• Base gasket for cylinder-to-case sealing
• Cylinder O-rings and all top end-specific O-rings and seals

Key Features:

• MLS Head Gasket Construction – Multi-layer steel design promotes an even torque load across the sealing surface, reducing bore distortion and improving piston ring seal for maximum power retention
• Viton Rubber Coating – Outer layers are embossed and coated with a Viton rubber material, purpose-built to handle the high cylinder pressures of today's high-output 4-stroke engines
• Chemical-Resistant Aramid Fiber – Non-asbestos, flexible aramid fiber laminated over a stainless steel core creates thick, robust gaskets that resist tearing or folding during installation
• Superior Heat Dissipation – Head gasket material draws heat away from the combustion ring and disperses it evenly across the gasket surface, eliminating hot spots and preventing premature gasket failure
• OEM-Spec Precision – Manufactured to original equipment tolerances for a drop-in fit with no trimming or modification required
• Made in the USA – Built to Cometic's strict quality standards for reliable, long-lasting sealing performance

Cometic's top end gasket kits are the trusted choice for motocross and off-road engine rebuilders. Whether refreshing a worn motor or rebuilding after a performance upgrade, the C3635 delivers the sealing integrity needed to keep a CRF250R running at full power.