{"product_id":"80-inch-flh-fx-piston-set-040-oversize","title":"80 inch FLH-FX Piston Set .040 Oversize","description":"\u003cp\u003eKeith Black piston set is .040 oversize and is for a 3.498″ inch bore. Piston set has a compression of 8.3:1 and includes rings.\n\u003cbr\u003eThe Keith Black 390 hypereutectic alloy is cast in a permanent steel mold which makes it possible to build a light weight piston that makes more power and uses less fuel and lasts longer. Pistons are .040 oversize  for a 3.498 inch bore and has a 9.5:1 compression ratio. The low heat transfer of the alloy keeps the skirts cool so piston expansion is minimal. The combination of a low heat transfer piston alloy and high compression ring placement increases power and economy. The high ring placement alone reduces detonation and increases the top ring temperature.                                                                     **Note: Run engine at moderate speeds for at least 500 miles  avoiding excessive running in lower gears  in order to properly break-in new pistons and rings. \n\u003cbr\u003e Instructions: http:\/\/www.vtwinmfg.com\/Instructions\/MS\/KB Sym-Asym Piston Installation Guide.pdf\u003c\/p\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1978 Harley Davidson FL\u003cbr\u003e\n1978 Harley Davidson Fx\u003cbr\u003e\n1979 Harley Davidson FL\u003cbr\u003e\n1979 Harley Davidson FLT\u003cbr\u003e\n1979 Harley Davidson Fx\u003cbr\u003e\n1980 Harley Davidson FL\u003cbr\u003e\n1980 Harley Davidson FLT\u003cbr\u003e\n1980 Harley Davidson Fx\u003cbr\u003e\n1981 Harley Davidson FL\u003cbr\u003e\n1981 Harley Davidson FLT\u003cbr\u003e\n1981 Harley Davidson Fx\u003cbr\u003e\n1982 Harley Davidson FL\u003cbr\u003e\n1982 Harley Davidson FLT\u003cbr\u003e\n1982 Harley Davidson Fx\u003cbr\u003e\n1982 Harley Davidson FXR\u003cbr\u003e\n1983 Harley Davidson FL\u003cbr\u003e\n1983 Harley Davidson FLT\u003cbr\u003e\n1983 Harley Davidson Fx\u003cbr\u003e\n1983 Harley Davidson FXR\u003cbr\u003e\n1984 Harley Davidson FL\u003cbr\u003e\n1984 Harley Davidson Fx","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":55921733697704,"sku":"11-2256","price":536.95,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/11-2256.jpg?v=1787862332","url":"https:\/\/speedguyscanada.com\/products\/80-inch-flh-fx-piston-set-040-oversize","provider":"THE SPEED GUYS CANADA ","version":"1.0","type":"link"}