Cometic C8140 Copper Cylinder Base Gasket .010" for 1157-1260cc Engines

The Cometic C8140 is a precision-engineered copper cylinder base gasket designed for high-performance powersports applications. This .010-inch thick gasket is specifically manufactured for engines ranging from 1157cc to 1260cc with a 3.285-inch bore diameter, commonly found in Yamaha FJ1100 and FJ1200 motorcycles.

Key Features:

• Premium copper construction provides superior thermal conductivity and sealing performance
• .010-inch thickness allows for precise deck height adjustment and compression tuning
• Engineered for 3.285-inch bore applications
• Designed to meet and exceed OEM specifications
• Ideal for engine builders seeking to optimize piston-to-head squish clearance
• Manufactured in the USA with high-quality materials

Copper base gaskets are the preferred choice for performance and racing applications due to their ability to withstand extreme temperatures and pressures while maintaining an excellent seal. The .010-inch thickness simplifies engine setup when building custom or high-performance powerplants, allowing builders to fine-tune compression ratios and piston-to-head clearances.