{"product_id":"keith-black-390-hypereutectic-alloy-80-inch-evolution-flat-piston-kit-030-for-harley-davidson-fxr","title":"Keith Black 390 Hypereutectic Flat Top Piston Kit.030 For Harley FXR 80 Inch","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black 390 Hypereutectic Flat Top Piston Kit.030 For Harley FXR 80 Inch\u003c\/h1\u003e\n\u003cp\u003eKeith Black 390 Hypereutectic Flat Top Piston Kit.030 oversize for Harley FXR 80 Inch delivers higher power output, improved fuel efficiency, and extended engine longevity on 1984–1993 Big Twin Evolution engines. The lightweight piston is cast in a permanent steel mold and uses a hypereutectic alloy for durability and heat resistance, optimized for demanding riding conditions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Keith Black hypereutectic alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversize \/ Bore:\u003c\/strong\u003e.030 oversize to fit a 3.498-inch bore\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression:\u003c\/strong\u003e 8.5:1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat management:\u003c\/strong\u003e Low heat transfer alloy keeps piston skirts cool, reducing expansion and wear\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing placement:\u003c\/strong\u003e High compression ring position enhances power output and detonation resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Fits Harley Davidson FXR models from 1984 to 1993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Includes instructions for proper break-in and installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e KB258.030\u003c\/li\u003e\n\u003c\/ul\u003eKeith Black flat top piston set is.030 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.\n\u003cp\u003eThe Keith Black 390 hypereutectic alloy piston kit is engineered for high performance and durability in Harley Davidson FXR models from 1984 to 1993. Cast in a permanent steel mold, this lightweight piston promotes increased power output, improved fuel efficiency, and extended engine longevity. Designed with a.030 oversize to fit a 3.498-inch bore, the piston features an 8.5:1 compression ratio, optimizing engine performance while maintaining reliability. The premium hypereutectic alloy's low heat transfer properties keep the piston skirts cool, minimizing expansion and reducing wear under demanding conditions. This advanced material, combined with high compression ring placement, enhances power and economy by reducing detonation and increasing top ring temperature for better sealing and performance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eMaterial: Keith Black hypereutectic alloy offers durability and heat resistance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eDesign: Lightweight construction for increased power and fuel efficiency\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eBore Size: Oversized.030 to fit a 3.498-inch bore\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCompression Ratio: 8.5:1 for balanced performance and reliability\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eHeat Transfer: Low heat transfer alloy keeps piston skirts cool, reducing expansion\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eRing Placement: High compression ring position improves power output and detonation resistance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eApplication: Fits Harley Davidson FXR models from 1984 to 1993\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eInstallation: Includes instructions for proper break-in and installation\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson FLST 1986\u003cbr\u003e\nHarley Davidson FLST 1987\u003cbr\u003e\nHarley Davidson FLST 1988\u003cbr\u003e\nHarley Davidson FLST 1989\u003cbr\u003e\nHarley Davidson FLST 1990\u003cbr\u003e\nHarley Davidson FLST 1991\u003cbr\u003e\nHarley Davidson FLST 1992\u003cbr\u003e\nHarley Davidson FLST 1993\u003cbr\u003e\nHarley Davidson FLST 1994\u003cbr\u003e\nHarley Davidson FLST 1995\u003cbr\u003e\nHarley Davidson FLST 1996\u003cbr\u003e\nHarley Davidson FLST 1997\u003cbr\u003e\nHarley Davidson FLST 1998\u003cbr\u003e\nHarley Davidson FLT 1984\u003cbr\u003e\nHarley Davidson FLT 1985\u003cbr\u003e\nHarley Davidson FLT 1986\u003cbr\u003e\nHarley Davidson FLT 1987\u003cbr\u003e\nHarley Davidson FLT 1988\u003cbr\u003e\nHarley Davidson FLT 1989\u003cbr\u003e\nHarley Davidson FLT 1990\u003cbr\u003e\nHarley Davidson FLT 1991\u003cbr\u003e\nHarley Davidson FLT 1992\u003cbr\u003e\nHarley Davidson FLT 1993\u003cbr\u003e\nHarley Davidson FLT 1994\u003cbr\u003e\nHarley Davidson FLT 1995\u003cbr\u003e\nHarley Davidson FLT 1996\u003cbr\u003e\nHarley Davidson FLT 1997\u003cbr\u003e\nHarley Davidson FLT 1998\u003cbr\u003e\nHarley Davidson FXD 1991\u003cbr\u003e\nHarley Davidson FXD 1992\u003cbr\u003e\nHarley Davidson FXD 1993\u003cbr\u003e\nHarley Davidson FXD 1994\u003cbr\u003e\nHarley Davidson FXD 1995\u003cbr\u003e\nHarley Davidson FXD 1996\u003cbr\u003e\nHarley Davidson FXD 1997\u003cbr\u003e\nHarley Davidson FXD 1998\u003cbr\u003e\nHarley Davidson FXR 1984\u003cbr\u003e\nHarley Davidson FXR 1985\u003cbr\u003e\nHarley Davidson FXR 1986\u003cbr\u003e\nHarley Davidson FXR 1987\u003cbr\u003e\nHarley Davidson FXR 1988\u003cbr\u003e\nHarley Davidson FXR 1989\u003cbr\u003e\nHarley Davidson FXR 1990\u003cbr\u003e\nHarley Davidson FXR 1991\u003cbr\u003e\nHarley Davidson FXR 1992\u003cbr\u003e\nHarley Davidson FXR 1993\u003cbr\u003e\nHarley Davidson FXR 1994\u003cbr\u003e\nHarley Davidson FXST 1984\u003cbr\u003e\nHarley Davidson FXST 1985\u003cbr\u003e\nHarley Davidson FXST 1986\u003cbr\u003e\nHarley Davidson FXST 1987\u003cbr\u003e\nHarley Davidson FXST 1988\u003cbr\u003e\nHarley Davidson FXST 1989\u003cbr\u003e\nHarley Davidson FXST 1990\u003cbr\u003e\nHarley Davidson FXST 1991\u003cbr\u003e\nHarley Davidson FXST 1992\u003cbr\u003e\nHarley Davidson FXST 1993\u003cbr\u003e\nHarley Davidson FXST 1994\u003cbr\u003e\nHarley Davidson FXST 1995\u003cbr\u003e\nHarley Davidson FXST 1996\u003cbr\u003e\nHarley Davidson FXST 1997\u003cbr\u003e\nHarley Davidson FXST 1998\u003c\/div\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44653148602410,"sku":"11-2220","price":198.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2220.jpg?v=1785887657","url":"https:\/\/atticusgoods.com\/products\/keith-black-390-hypereutectic-alloy-80-inch-evolution-flat-piston-kit-030-for-harley-davidson-fxr","provider":"Atticus Goods","version":"1.0","type":"link"}