Cometic C8242 Copper Cylinder Base Gasket .020" 1314cc Yamaha FJ1100 FJ1200

The Cometic C8242 is a precision-engineered copper cylinder base gasket designed for Yamaha FJ1100 (1984-1985) and FJ1200 (1986-1993) motorcycles with 1314cc engines. This high-performance gasket features a compressed thickness of .020 inches (0.020") and a 3.460-inch bore diameter, making it ideal for performance builds and cylinder deck height adjustments.

Key Features:

• Premium copper construction for superior heat dissipation and sealing
• .020" compressed thickness allows precise piston-to-head squish area tuning
• 3.460" bore diameter specifically designed for FJ1100/FJ1200 engines
• Engineered for reliable sealing under extreme high-performance conditions
• Simplifies engine setup when building performance applications
• Available in multiple thicknesses for custom deck height configurations

Cometic copper base gaskets are selected for their resistance to corrosion, excellent tensile and yielding strength, and superior thermal conductivity. The copper material provides optimal conformability to sealing surfaces while maintaining structural integrity under high cylinder pressures and temperatures. This gasket is essential for engine builders who need to precisely control compression ratios and squish clearances in modified or performance Yamaha FJ-series inline-four engines.