{"product_id":"keith-black-390-hypereutectic-alloy-1000cc-piston-set-030-oversize-for-harley-davidson-xl","title":"Keith Black 390 Hypereutectic 1000cc Piston Set.030 Oversize for Harley XL","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black 390 Hypereutectic 1000cc Piston Set.030 Oversize for Harley XL\u003c\/h1\u003e\n\u003cp\u003eKeith Black dome piston set in.030 oversize for Harley-Davidson XL 1000cc engines. Cast in a permanent steel mold from a hypereutectic alloy, these pistons are engineered for high performance and durability in Harley Davidson XL engines.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003eOversize:.030 over for a 3.188-inch bore\u003c\/li\u003e\n\u003cli\u003eCompression ratio: 9:1\u003c\/li\u003e\n\u003cli\u003eAlloy: Hypereutectic; low heat transfer helps keep piston skirts cool and reduce expansion\u003c\/li\u003e\n\u003cli\u003eHigh ring placement: Minimizes detonation and maintains top ring temperature for better sealing\u003c\/li\u003e\n\u003cli\u003eCompatibility: Fits Harley Davidson XL models from 1972 to 1981\u003c\/li\u003e\n\u003cli\u003eConstruction: Cast in a permanent steel mold\u003c\/li\u003e\n\u003cli\u003eAccessories: Ring-O-Matic Ring Compressor Tool Kit and Connecting Rod Clamping Tool included, plus a Piston Set.010 Oversize Fitment\u003c\/li\u003e\n\u003cli\u003eOrigin: Constructed in Mexico\u003c\/li\u003e\n\u003cli\u003ePart number: KB292.030\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eProper installation and break-in procedures are essential; run the engine at moderate speeds for at least 500 miles to ensure optimal piston and ring seating. This piston set offers a reliable upgrade for Harley Davidson XL owners seeking enhanced performance and durability for daily riding or performance applications.\u003c\/p\u003eKeith Black dome piston set is.030 oversize with a 8.2 compression ratio for 1972-1985 XL 1000cc models.\n\u003cp\u003eThe Keith Black 390 hypereutectic alloy piston set is engineered for high performance and durability in Harley Davidson XL engines. Cast in a permanent steel mold, these pistons are designed to deliver increased power, improved fuel efficiency, and extended longevity. With a.030 oversize fit for a 3.188-inch bore, the pistons feature a 9:1 compression ratio that optimizes engine output and efficiency. The low heat transfer characteristics of the alloy help keep the piston skirts cool, minimizing expansion and maintaining proper clearance under demanding conditions. This design enhances overall engine reliability and performance, especially during high-compression operations.\u003c\/p\u003e\n\u003cp\u003eThe high ring placement within these pistons plays a crucial role in reducing detonation and increasing the top ring temperature, which improves sealing and engine longevity. The combination of low heat transfer alloy and strategic ring placement results in better power delivery and fuel economy. These pistons are suitable for a wide range of Harley Davidson XL models from 1972 to 1981, ensuring a versatile fit for vintage motorcycle enthusiasts. Proper installation and break-in procedures are essential; it is recommended to run the engine at moderate speeds for at least 500 miles, avoiding excessive low-gear running to ensure optimal piston and ring seating. Instructional guidance is available at the manufacturer's website for proper fitment and installation.\u003c\/p\u003e\n\u003cp\u003eConstructed in Mexico, this piston set includes accessories to facilitate installation, such as a ring compressor tool kit and connecting rod clamping tools. The set offers a reliable upgrade for Harley Davidson XL owners seeking enhanced performance and durability from their engines, whether for daily riding or performance applications. Proper maintenance and break-in are vital to maximize the benefits of these high-performance pistons, ensuring long-lasting, consistent engine operation.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eHypereutectic alloy: Cast in a permanent steel mold for durability and performance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eOversize fit:.030 over for a 3.188-inch bore, ideal for engine rebuilds\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCompression ratio: 9:1 optimized for power and efficiency\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eLow heat transfer alloy: Keeps piston skirts cool, reducing expansion\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eHigh ring placement: Minimizes detonation and enhances top ring temperature\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCompatibility: Fits Harley Davidson XL models from 1972 to 1981\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 - Piston Set.010 Oversize\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson XL 1972\u003cbr\u003e\nHarley Davidson XL 1973\u003cbr\u003e\nHarley Davidson XL 1974\u003cbr\u003e\nHarley Davidson XL 1975\u003cbr\u003e\nHarley Davidson XL 1976\u003cbr\u003e\nHarley Davidson XL 1977\u003cbr\u003e\nHarley Davidson XL 1978\u003cbr\u003e\nHarley Davidson XL 1979\u003cbr\u003e\nHarley Davidson XL 1980\u003cbr\u003e\nHarley Davidson XL 1981\u003cbr\u003e\nHarley Davidson XL 1982\u003cbr\u003e\nHarley Davidson XL 1983\u003cbr\u003e\nHarley Davidson XL 1984\u003cbr\u003e\nHarley Davidson XL 1985\u003c\/div\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44653117964330,"sku":"11-2243","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2243.jpg?v=1785885788","url":"https:\/\/atticusgoods.com\/products\/keith-black-390-hypereutectic-alloy-1000cc-piston-set-030-oversize-for-harley-davidson-xl","provider":"Atticus Goods","version":"1.0","type":"link"}