SKU:11-2200
Keith Black 74 Inch FLH-FX piston set, standard size for a 3.438-inch bore, is designed to upgrade Harley‑Davidson FL engines from 1941 through 1950. This 390 hypereutectic piston set delivers a compression ratio of 9.0:1 and is crafted in Mexico for precise, durable performance on vintage V‑twin builds.
This complete piston kit includes all components needed for a full rebuild and carries the part number KB263.STD. The set is engineered to provide reliable seating and consistent compression when paired with appropriate rings and accessories.
Installation and break‑in are essential for optimal results: run the engine at moderate speeds for at least 500 miles and avoid extended low‑gear operation to promote proper piston and ring seating. For best results, consult the detailed Ring‑Sym‑Asym Piston Installation Guide at the linked PDF.
Recommended accessories to enhance compression and fitment: 74-inch moly piston ring set (SKU 11-1368), Ring‑O‑Matic Ring Compressor Tool Kit (SKU 16-0622), and Connecting Rod Clamping Tool (SKU 16-0029).
Keith Black 390 hypereutectic piston set is standard size and is for a 3.438 inch bore. Pistons have a compression of 9.0:1.Upgrade your vintage Harley Davidson FL with the Keith Black 74 Inch FLH-FX Piston Set, part number KB263.STD. Crafted in Mexico, this piston set is designed specifically to fit Harley models from 1941 through 1950, ensuring a precise and reliable fit for your classic motorcycle. Made from high-quality materials, these pistons are engineered to withstand the demands of engine performance and durability. Proper installation and break-in procedures are essential; run your engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears to ensure optimal piston and ring seating. Refer to the detailed installation guide available at http://www.vtwinmfg.com/Instructions/MS/KB Sym-Asym Piston Installation Guide.pdf for best results. This set includes all necessary components for a complete rebuild, making it a convenient choice for restoring or maintaining your vintage Harley.
The Keith Black pistons are compatible with recommended accessories such as the 74-inch moly piston ring set (SKU 11-1368) to achieve optimal compression and sealing. For ease of installation, consider the Ring-O-Matic Ring Compressor Tool Kit (SKU 16-0622) and the Connecting Rod Clamping Tool (SKU 16-0029). These accessory items simplify the installation process and help ensure a proper fit. Whether you're restoring a classic Harley or performing a performance upgrade, this piston set offers quality, durability, and a perfect fit for your vintage bike, backed by Keith Black’s reputation for high-performance engine components.
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