SKU:11-2204
Upgrade your Harley-Davidson FL engine with the Keith Black 74 inch FLH-FX piston set. This.030 oversize, 3.438 inch bore piston set is built for Harley models from 1941 to 1950 and is crafted with precision in Mexico using Keith Black’s hypereutectic design for durable, reliable performance. The pistons are part of the Keith Black 390 series and are designed to meet or exceed OEM standards.
The piston set fits a broad range of Harley-Davidson FL models (1941–1977) and FX models (1971–1977), making it suitable for restoration projects as well as performance upgrades. Each piston is engineered to deliver dependable power delivery and smooth operation across riding conditions.
Break-in guidance is essential: run the engine at moderate speeds for at least 500 miles and avoid excessive running in lower gears to ensure proper piston and ring seating. For installation details, refer to the guide at http://www.vtwinmfg.com/Instructions/MS/KB Sym-Asym Piston Installation Guide.pdf.
Pair this set with the recommended 11-1371 74 inch moly piston ring set (.030 oversize) and consider the Ring-O-Matic ring compressor kit (16-0622), the Connecting Rod Clamping Tool (16-0029), and other installation accessories to support a smooth rebuild or upgrade.
Keith Black 390 hypereutectic piston set is.030 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.Upgrade your Harley Davidson FL engine with the Keith Black 11-2204 74 inch FLH-FX piston set designed specifically for models from 1941 to 1950. Crafted with precision in Mexico, this piston set features a.030 oversize, offering improved performance and durability for your vintage motorcycle. The set includes pistons engineered to meet or exceed OEM standards, providing reliable power delivery and smooth operation during your rides. Proper break-in is essential; run the engine at moderate speeds for at least 500 miles, avoiding excessive running in lower gears to ensure optimal piston and ring seating. For detailed installation instructions, visit http://www.vtwinmfg.com/Instructions/MS/KB Sym-Asym Piston Installation Guide.pdf. The piston set is compatible with a range of Harley Davidson FL models, making it an ideal choice for restoration or performance upgrades. Pair it with recommended accessories such as the 11-1371 moly piston ring set, or utilize accessory tools like the Ring-O-Matic ring compressor kit, connecting rod clamping tool, and other essential installation equipment to facilitate a seamless installation process. Trust in Keith Black’s quality craftsmanship to bring new life to your classic motorcycle engine, ensuring longevity and dependable performance. Whether restoring or enhancing your Harley, this piston set is an essential component for a successful rebuild or upgrade.
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