Cometic C8939 MLS Wave Head Gasket 106mm Bore .030" KTM RC8 1190

The Cometic C8939 is a high-performance Multi-Layer Steel (MLS) Wave head gasket engineered specifically for 2009-2017 KTM RC8 1190 motorcycles with a 106mm bore diameter and .030" compressed thickness. This premium gasket provides a reliable, high-strength sealing solution for both stock and performance applications.

Multi-Layer Steel Construction:

• Multiple layers of embossed stainless steel for superior strength and durability
• Viton-coated outer layers bonded with .001" thick high-temperature rubber for enhanced sealing
• Load-controlled embossments distribute clamping force evenly across the sealing surface
• Requires less clamp load than traditional gaskets, reducing bore distortion
• Non-intrusive rivets securely hold layers together

Key Specifications:

• Bore Diameter: 106mm
• Compressed Thickness: .030" (high compression application)
• Application: KTM RC8 1190 (2009-2017)
• Material: Multi-Layer Stainless Steel with Viton coating
• No sealant or re-torque required when properly installed

Installation Requirements:

• Surface finish of 50 RA (roughness average) or finer recommended
• Smooth, flat, and true head and deck surfaces required for proper seal
• Verify piston-to-head clearance (.030"-.032" optimum) before installation
• Install dry - gasket is pre-coated and requires no additional sealant
• Follow fastener manufacturer torque specifications

The .030" thickness makes this gasket ideal for high-compression builds where reducing combustion chamber volume is desired. Cometic's proprietary coatings and embossments create a micro-seal that effectively contains fluids and combustion gases, even under extreme pressure and temperature conditions. Trusted by professional engine builders and racers worldwide for exceptional sealing performance and long-lasting reliability.