{"product_id":"keith-black-390-hypereutectic-alloy-piston-set-for-harley-davidson-xl-1200cc-040-oversize","title":"Keith Black KB295 040 Oversize Piston Set Harley XL1200","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black KB295.040 Oversize Piston Set Harley XL1200\u003c\/h1\u003e\n\u003cp\u003eUpgrade your Harley Davidson XL Evolution engine with the Keith Black KB295.040 oversize piston set, engineered for 3.498 inch bore engines and 1988–1997 XL 1200cc models. The pistons use hypereutectic alloy designed for durability and heat resistance, cast in a permanent steel mold for precise manufacturing, and produced with a lightweight design to boost response and fuel efficiency.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.040 oversize piston set\u003c\/li\u003e\n\u003cli\u003eHypereutectic alloy construction\u003c\/li\u003e\n\u003cli\u003e3.498 inch bore compatibility\u003c\/li\u003e\n\u003cli\u003eLightweight design enhances power delivery\u003c\/li\u003e\n\u003cli\u003eLow heat transfer alloy reduces skirt expansion\u003c\/li\u003e\n\u003cli\u003eHigh ring placement helps minimize detonation and improve top ring temperature\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary components for installation\u003c\/li\u003e\n\u003cli\u003eMade in Mexico\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBreak-in guidance: run the engine at moderate speeds for at least 500 miles and avoid lugging or low gear operation to maximize longevity of the pistons and rings.\u003c\/p\u003e\n\u003cp\u003eFor installation ease, consider piston ring sets, ring compressor tools, and piston ring grinders as recommended accessories.\u003c\/p\u003eKeith Black flat top piston set is.040 oversize with a 8.9:1 compression ratio for 1988-up XL 1200cc Evolution models.\n\u003cp\u003eUpgrade your Harley Davidson XL engine with the Keith Black 390 hypereutectic alloy piston set, designed for optimal performance and durability. Cast in a permanent steel mold, these pistons are expertly crafted to provide lightweight construction that enhances power output, fuel efficiency, and longevity. The.040 oversize pistons are compatible with 3.498-inch bore engines, making them an ideal choice for engine rebuilds or performance upgrades. The 9:1 compression ratio ensures a balanced mix of power and efficiency, while the low heat transfer alloy helps keep the piston skirts cool, minimizing expansion and wear over time. This combination of material properties and high compression ring placement reduces detonation risk, increases top ring temperature, and improves overall engine performance. Proper break-in procedures, including running the engine at moderate speeds for at least 500 miles and avoiding low gear operation, are recommended to maximize the lifespan of the new pistons and rings. The set includes all necessary components for installation, and detailed instructions are available for reference. Whether you're restoring an older model or enhancing your Harley’s engine, these pistons deliver reliable, high-quality performance. Compatible with models from 1988 to 1997, they are a valuable upgrade for enthusiasts seeking to improve engine efficiency and power output. The Keith Black pistons are proudly made in Mexico, ensuring quality craftsmanship. Accessories such as piston ring sets, ring compressor tools, and piston ring grinders are recommended to facilitate installation and optimize performance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eHypereutectic alloy construction for durability and heat resistance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCast in a permanent steel mold for precise manufacturing\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eLightweight design enhances power and fuel efficiency\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003e.040 oversize suitable for 3.498 inch bore engines\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003e9:1 compression ratio for balanced performance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eLow heat transfer alloy keeps piston skirts cool and reduces expansion\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eHigh ring placement minimizes detonation and increases top ring temperature\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eIncludes all necessary components for installation\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eDesigned to fit Harley Davidson XL models from 1988 to 1997\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson XL 1988\u003cbr\u003e\nHarley Davidson XL 1989\u003cbr\u003e\nHarley Davidson XL 1990\u003cbr\u003e\nHarley Davidson XL 1991\u003cbr\u003e\nHarley Davidson XL 1992\u003cbr\u003e\nHarley Davidson XL 1993\u003cbr\u003e\nHarley Davidson XL 1994\u003cbr\u003e\nHarley Davidson XL 1995\u003cbr\u003e\nHarley Davidson XL 1996\u003cbr\u003e\nHarley Davidson XL 1997\u003cbr\u003e\nHarley Davidson XL 1998\u003cbr\u003e\nHarley Davidson XL 1999\u003cbr\u003e\nHarley Davidson XL 2000\u003cbr\u003e\nHarley Davidson XL 2001\u003cbr\u003e\nHarley Davidson XL 2002\u003cbr\u003e\nHarley Davidson XL 2003\u003cbr\u003e\nHarley Davidson XL 2004\u003cbr\u003e\nHarley Davidson XL 2005\u003cbr\u003e\nHarley Davidson XL 2006\u003cbr\u003e\nHarley Davidson XL 2007\u003cbr\u003e\nHarley Davidson XL 2008\u003cbr\u003e\nHarley Davidson XL 2009\u003cbr\u003e\nHarley Davidson XL 2010\u003cbr\u003e\nHarley Davidson XL 2011\u003cbr\u003e\nHarley Davidson XL 2012\u003cbr\u003e\nHarley Davidson XL 2013\u003cbr\u003e\nHarley Davidson XL 2014\u003cbr\u003e\nHarley Davidson XL 2015\u003cbr\u003e\nHarley Davidson XL 2016\u003cbr\u003e\nHarley Davidson XL 2017\u003cbr\u003e\nHarley Davidson XL 2018\u003cbr\u003e\nHarley Davidson XL 2019\u003cbr\u003e\nHarley Davidson XL 2020\u003cbr\u003e\nHarley Davidson XL 2021\u003cbr\u003e\nHarley Davidson XL 2022\u003cbr\u003e\nHarley Davidson XL 2023\u003cbr\u003e\nHarley Davidson XL 2024\u003cbr\u003e\nHarley Davidson XL 2025\u003cbr\u003e\nHarley Davidson XL 2026\u003c\/div\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44653115015210,"sku":"11-2250","price":201.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2250.jpg?v=1785885671","url":"https:\/\/atticusgoods.com\/products\/keith-black-390-hypereutectic-alloy-piston-set-for-harley-davidson-xl-1200cc-040-oversize","provider":"Atticus Goods","version":"1.0","type":"link"}