{"product_id":"keith-black-74-inch-flh-fx-piston-set-050-oversize-for-harley-davidson-fl-models","title":"Keith Black KB263.050 Piston Set.050 Oversize for 74 Inch Harley FL 1941–1950","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black KB263.050 Piston Set:.050 Oversize for 74-Inch Harley FL (1941–1950)\u003c\/h1\u003e\n\u003cp\u003eKeith 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.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003eBore: 3.438 inches\u003c\/li\u003e\n\u003cli\u003eOversize:.050\u003c\/li\u003e\n\u003cli\u003eCompression height: 1.450 inches\u003c\/li\u003e\n\u003cli\u003eCompression ratio: 9.0:1\u003c\/li\u003e\n\u003cli\u003eMaterial: Keith Black 390 hypereutectic alloy\u003c\/li\u003e\n\u003cli\u003eFitment: Harley-Davidson FL 1941–1950 (74-inch)\u003c\/li\u003e\n\u003cli\u003eCountry of origin: Mexico\u003c\/li\u003e\n\u003cli\u003ePart number: KB263.050\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThe 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.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e11-1373 - 74 inch Moly Piston Ring Set.050 Oversize\u003c\/li\u003e\n\u003cli\u003e16-0622 - Ring-O-Matic Ring Compressor Tool Kit\u003c\/li\u003e\n\u003cli\u003e16-0029 - Connecting Rod Clamping Tool\u003c\/li\u003e\n\u003cli\u003e60-0167 - Measurement Tool\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eBreak-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.\u003c\/p\u003eKeith Black 390 hypereutectic piston set is.050 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.\n\u003cp\u003eUpgrade 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.\u003c\/p\u003e\n\u003cp\u003eConstructed 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 \u003ca href=\"http:\/\/www.vtwinmfg.com\/Instructions\/MS\/KB%20Sym-Asym%20Piston%20Installation%20Guide.pdf\"\u003ethis link\u003c\/a\u003e. The set is compatible with 74-inch engines and is ideal for restoring the classic Harley Davidson FL.\u003c\/p\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eFitment: Compatible with 1941-1950 Harley Davidson FL models\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eMaterial: High-quality pistons manufactured by Keith Black\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003ePart Number: KB263.050\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCompression Height: 1.450 inches\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCountry of Origin: Mexico\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eSuggested Items: 11-1373 - 74 inch Moly Piston Ring Set.050 Oversize\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eAccessory Items: 16-0622 - Ring-O-Matic Ring Compressor Tool Kit, 16-0029 - Connecting Rod Clamping Tool, 60-0167\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":44653168689194,"sku":"11-2206","price":203.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2206.jpg?v=1785888691","url":"https:\/\/atticusgoods.com\/products\/keith-black-74-inch-flh-fx-piston-set-050-oversize-for-harley-davidson-fl-models","provider":"Atticus Goods","version":"1.0","type":"link"}