SKU:11-2256
Keith Black’s 80 inch FLH-FX piston set is.040 oversize for a 3.498″ bore and includes rings. Cast from a hypereutectic alloy and molded in a permanent steel mold, these pistons deliver precise dimensions, strength, and heat resistance for Harley engines from 1978–1984.
These pistons are intended to restore or upgrade vintage Harleys, offering improved power, efficiency, and longevity compared to worn components. Proper break-in requires moderate speeds for at least 500 miles to allow the rings and pistons to seat correctly. Refer to the Keith Black Piston Installation Guide for installation guidance.
Keith Black piston set is.040 oversize and is for a 3.498″ inch bore. Piston set has a compression of 8.3:1 and includes rings.Upgrade your Harley Davidson with the Keith Black 80 inch FLH-FX Piston Set, part number KB297.040. These pistons are crafted from the advanced hypereutectic alloy, offering a combination of strength, durability, and heat resistance. Cast in a permanent steel mold, this alloy allows the creation of lightweight pistons that deliver increased power, improved fuel efficiency, and longer lifespan. Designed with a.040 oversize for a 3.498-inch bore, these pistons are ideal for restoring or enhancing vintage Harley Davidson models from 1978 to 1984, including FL and FX series motorcycles.
The low heat transfer properties of the Keith Black alloy keep the piston skirts cooler during operation, minimizing expansion and ensuring consistent performance. The pistons feature a 9.5:1 compression ratio that optimizes power output while maintaining reliable operation. The strategic high ring placement not only boosts compression but also reduces detonation, contributing to smoother running and increased engine longevity. Proper break-in is essential: run the engine at moderate speeds for at least 500 miles, avoiding excessive low gear operation to allow the rings and pistons to seat correctly. For installation guidance, refer to the Keith Black Piston Installation Guide linked in the instructions.
This piston set is a perfect fit for Harley Davidson models including 1978-1984 FL and FX series, ensuring a precise fit and reliable performance. Along with the pistons, consider using recommended accessory items such as the Ring-O-Matic Ring Compressor Tool Kit and Connecting Rod Clamping Tool for proper installation. Enhance your engine rebuild with these high-quality pistons designed for performance, longevity, and efficiency, making them an excellent choice for both restoration projects and performance upgrades.
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