{"product_id":"keith-black-74-inch-flh-fx-piston-set-standard-size-for-harley-davidson-fl-models","title":"Keith Black 74 Inch FLH-FX Piston Set 3.438 Bore Standard Size For Harley","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black 74 Inch FLH-FX Piston Set 3.438 Bore Standard Size For Harley\u003c\/h1\u003e\n\u003cp\u003eKeith 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.\u003c\/p\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003cp\u003eInstallation 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.\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eFits Harley Davidson FL models from 1941 to 1950\u003c\/li\u003e \u003cli\u003eStandard size pistons for reliable performance\u003c\/li\u003e \u003cli\u003eMade in Mexico with high‑quality materials\u003c\/li\u003e \u003cli\u003eIncludes complete piston set for easy installation\u003c\/li\u003e \u003cli\u003eDesigned for proper break‑in and long‑lasting durability\u003c\/li\u003e \u003cli\u003eCompatible with recommended piston rings and accessories\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRecommended 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).\u003c\/p\u003eKeith Black 390 hypereutectic piston set is standard size and is for a 3.438 inch bore. Pistons have a compression of 9.0:1.\n\u003cp\u003eUpgrade 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.\u003cbr\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eFits Harley Davidson FL models from 1941 to 1950\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eStandard size pistons for reliable performance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eMade in Mexico with high-quality materials\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eIncludes complete piston set for easy installation\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eDesigned for proper break-in and long-lasting durability\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCompatible with recommended piston rings and accessories\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eEngineered to enhance vintage Harley Davidson engine performance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson FL 1941\u003cbr\u003e\nHarley Davidson FL 1942\u003cbr\u003e\nHarley Davidson FL 1943\u003cbr\u003e\nHarley Davidson FL 1944\u003cbr\u003e\nHarley Davidson FL 1945\u003cbr\u003e\nHarley Davidson FL 1946\u003cbr\u003e\nHarley Davidson FL 1947\u003cbr\u003e\nHarley Davidson FL 1948\u003cbr\u003e\nHarley Davidson FL 1949\u003cbr\u003e\nHarley Davidson FL 1950\u003cbr\u003e\nHarley Davidson FL 1951\u003cbr\u003e\nHarley Davidson FL 1952\u003cbr\u003e\nHarley Davidson FL 1953\u003cbr\u003e\nHarley Davidson FL 1954\u003cbr\u003e\nHarley Davidson FL 1955\u003cbr\u003e\nHarley Davidson FL 1956\u003cbr\u003e\nHarley Davidson FL 1957\u003cbr\u003e\nHarley Davidson FL 1958\u003cbr\u003e\nHarley Davidson FL 1959\u003cbr\u003e\nHarley Davidson FL 1960\u003cbr\u003e\nHarley Davidson FL 1961\u003cbr\u003e\nHarley Davidson FL 1962\u003cbr\u003e\nHarley Davidson FL 1963\u003cbr\u003e\nHarley Davidson FL 1964\u003cbr\u003e\nHarley Davidson FL 1965\u003cbr\u003e\nHarley Davidson FL 1966\u003cbr\u003e\nHarley Davidson FL 1967\u003cbr\u003e\nHarley Davidson FL 1968\u003cbr\u003e\nHarley Davidson FL 1969\u003cbr\u003e\nHarley Davidson FL 1970\u003cbr\u003e\nHarley Davidson FL 1971\u003cbr\u003e\nHarley Davidson FL 1972\u003cbr\u003e\nHarley Davidson FL 1973\u003cbr\u003e\nHarley Davidson FL 1974\u003cbr\u003e\nHarley Davidson FL 1975\u003cbr\u003e\nHarley Davidson FL 1976\u003cbr\u003e\nHarley Davidson FL 1977\u003cbr\u003e\nHarley Davidson FX 1971\u003cbr\u003e\nHarley Davidson FX 1972\u003cbr\u003e\nHarley Davidson FX 1973\u003cbr\u003e\nHarley Davidson FX 1974\u003cbr\u003e\nHarley Davidson FX 1975\u003cbr\u003e\nHarley Davidson FX 1976\u003cbr\u003e\nHarley Davidson FX 1977\u003c\/div\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44653189824554,"sku":"11-2200","price":203.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2200.jpg?v=1785889358","url":"https:\/\/atticusgoods.com\/products\/keith-black-74-inch-flh-fx-piston-set-standard-size-for-harley-davidson-fl-models","provider":"Atticus Goods","version":"1.0","type":"link"}