SKU:11-2233
Keith Black KB272.040 oversize.040 piston set for Harley XL delivers a 3.498-inch bore and a 9:1 compression ratio, engineered to boost power and efficiency on 1986-up XL Evolution engines.
Run the engine at moderate speeds for at least 500 miles during break-in to ensure optimal performance and longevity.
Keith Black dish piston set is.040 oversize with a 9.0:1 compression ratio for 1986-up XL Evolution models.Upgrade your Harley Davidson XL motorcycle with the Keith Black KB272.040 piston set, designed for improved performance and durability. Crafted from hypereutectic alloy, these pistons are cast in a permanent steel mold, allowing for the creation of lightweight components that deliver more power while using less fuel. With a bore diameter of approximately 3.498 inches and a 9:1 compression ratio, these pistons are optimized for performance and efficiency. The alloy’s low heat transfer properties help keep the skirts cool, minimizing piston expansion and enhancing longevity. The high compression ring placement not only boosts power but also reduces detonation and increases the top ring temperature, contributing to smoother engine operation and better fuel economy.
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