{"product_id":"keith-black-kb258-040-80-inch-evolution-flat-piston-kit-040-oversize","title":"Keith Black KB258.040 80-Inch Evolution Flat Piston Kit .040 Oversize","description":"Keith Black flat top piston set is .040 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.\n\u003cp\u003eThe Keith Black KB258.040 80-inch Evolution Flat Piston Kit is designed with a .040-inch oversize for a 3.498-inch bore and an 8.5:1 compression ratio. The hypereutectic alloy is cast in a permanent steel mold to support a lightweight piston design intended to provide increased power, improved fuel economy, and extended service life.\u003c\/p\u003e\u003cp\u003eThe alloy's low heat transfer helps keep the piston skirts cooler, minimizing expansion. Combined with high compression ring placement, this design supports power and economy while helping reduce detonation and increase top ring temperature. The kit fits 1984 through 1993 Harley-Davidson FXR models as specified in the product data.\u003c\/p\u003e\u003cp\u003eFor proper break-in, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears. Keith Black KB258.040 is supplied as a set. A compatible suggested item is the 11-1367 80-inch Shovelhead Piston Ring Set .040.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Keith Black\u003c\/li\u003e\n\u003cli\u003ePart Number: KB258.040\u003c\/li\u003e\n\u003cli\u003eApplication: 80-inch Evolution flat piston kit\u003c\/li\u003e\n\u003cli\u003eOversize: .040-inch oversize\u003c\/li\u003e\n\u003cli\u003eBore: Designed for a 3.498-inch bore\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 8.5:1\u003c\/li\u003e\n\u003cli\u003eMaterial: Hypereutectic alloy\u003c\/li\u003e\n\u003cli\u003eDesign: Permanent steel mold casting with low heat transfer\u003c\/li\u003e\n\u003cli\u003eRing Placement: High compression ring placement\u003c\/li\u003e\n\u003cli\u003eQuantity: Supplied as a set\u003c\/li\u003e\n\u003cli\u003eFitment: 1984–1993 Harley-Davidson FXR models\u003c\/li\u003e\n\u003cli\u003eBreak-In: Run at moderate speeds for at least 500 miles and avoid excessive operation in lower gears\u003c\/li\u003e\n\u003cli\u003eAccessory Items: 16-0622 - Ring-O-Matic Ring Compressor Tool Kit, 60-0167, 16-0075 - Wrist Pin Ring Tool\u003c\/li\u003e\n\u003c\/ul\u003e\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","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44583440777303,"sku":"11-2221","price":286.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0556\/2276\/2583\/files\/11-2221.jpg?v=1793268629","url":"https:\/\/valleyspeed.net\/en-gb\/products\/keith-black-kb258-040-80-inch-evolution-flat-piston-kit-040-oversize","provider":"The Speed Shop Canada","version":"1.0","type":"link"}