SKU:11-2206
Keith Black 390 hypereutectic pistons in a.050 oversize for a 3.438-inch bore deliver precise clearance and reliable combustion for classic Harley-Davidson FL engines built between 1941 and 1950. With a compression height of 1.450 inches and a compression ratio of 9.0:1, this KB263.050 kit is designed to rebuild or restore a 74-inch Harley powerplant to stock specs while accommodating the oversize bore.
The kit includes all necessary components for a complete installation, making it suitable for a full engine rebuild or a power-enhancing restoration of a vintage Harley. For smoother assembly and seating of new rings, consider pairing with the recommended accessories listed below.
Break-in is essential: run the engine at moderate speeds for at least 500 miles, avoiding excessive lugging in lower gears to properly seat the pistons and rings. This piston set is ideal for restoring the classic Harley FL or building a focused 74-inch powerplant with reliable, repeatable performance.
Keith Black 390 hypereutectic piston set is.050 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.Upgrade your Harley Davidson FL motorcycle with the Keith Black KB263.050 piston set, designed specifically for 1941 to 1950 Harley Davidson FL models. Crafted in Mexico, these pistons feature a compression height of 1.450 inches, ensuring precise fitment and optimal engine performance. The set includes all necessary components for a complete installation, making it an excellent choice for rebuilding or enhancing your vintage Harley engine.
Constructed with high-quality materials, the Keith Black pistons provide durability and reliable performance. Proper break-in is essential; it is recommended to run the engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears to properly seat the new pistons and rings. The package includes instructions for installation, available at this link. The set is compatible with 74-inch engines and is ideal for restoring the classic Harley Davidson FL.
For optimal results, consider using recommended accessory items such as the 11-1373 74-inch moly piston ring set in.050 oversize, the Ring-O-Matic ring compressor tool kit (16-0622), the connecting rod clamping tool (16-0029), and the 60-0167 measurement tool. These accessories facilitate a smoother installation process, ensuring a secure fit and long-lasting performance. Whether you're restoring a vintage Harley or building a custom engine, this piston set provides the quality and fitment you need for a reliable rebuild.
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