SKU:11-2274
Keith Black 390 hypereutectic piston set for a 3.875 inch bore delivers a 9.3:1 compression ratio for Harley FXST models from 2007 through 2016, engineered to balance power, fuel efficiency, and durability.
Includes accessory installation items: Ring-O-Matic Ring Compressor Tool Kit (16-0622), Wrist Pin Ring Tool (16-0075), and additional components to facilitate proper fitment (60-0167).
Proper break-in procedures are recommended to maximize longevity and performance. Installers should follow moderate engine speeds for at least 500 miles and avoid excessive low-gear operation. Installation instructions are available to aid experienced technicians and DIY enthusiasts. Crafted in Mexico, this piston set is designed to enhance your Harley Davidson FXST engine’s power and durability.
Keith Black piston set is standard size and is for a 3.875 inch bore. Piston set has a compression of 9.3:1 and includes rings.The Keith Black 390 hypereutectic alloy piston set is engineered for high performance and durability in Harley Davidson FXST models from 2007 to 2016. Cast in a permanent steel mold, these pistons are designed to be lightweight, which helps increase power output while improving fuel efficiency and prolonging engine life. With a standard bore size of 3.875 inches and a compression ratio of 9.3:1, these pistons are optimized for a balance of performance and reliability. The low heat transfer properties of the alloy keep the piston skirts cooler, minimizing expansion and ensuring a tight fit during operation. This design enhances thermal management, contributing to better engine efficiency and longevity. High compression ring placement further boosts power and fuel economy while reducing detonation. Additionally, the high ring placement increases the top ring temperature, helping to prevent ring blow-by and maintain optimal sealing under high loads. Proper break-in procedures, including moderate engine speeds for at least 500 miles and avoiding excessive low gear operation, are recommended to ensure optimal performance and longevity. Installation instructions are available at the provided link, making the process straightforward for experienced technicians and DIY enthusiasts alike. These pistons are compatible with a range of Harley Davidson FXST models from 2007 through 2016, making them a versatile upgrade for performance-minded riders. The set includes accessory items such as a ring compressor tool kit, wrist pin ring tool, and additional components to facilitate installation and ensure a proper fit. Crafted in Mexico, this piston set combines quality manufacturing with reliable performance, making it an excellent choice for enhancing your Harley Davidson engine's power and durability.
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