{"product_id":"80-evolution-flat-piston-kit-020","title":"80 Evolution Flat Piston Kit .020","description":"\u003cp\u003eKeith Black flat top piston set is .020 oversize with an 8.6:1 compression ratio for 1984-up Big Twin Evolution models.\u003c\/p\u003e\n\u003cp\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 .020 over sized  for a 3.498 inch bore and has a 8.5:1 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.\u003c\/p\u003e\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Keith Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eV-Twin Part Number:\u003c\/strong\u003e 11-2219\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e KB258.020\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Group:\u003c\/strong\u003e Piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Evolution Pistons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e MEXICO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1984-1994 FXR\u003c\/li\u003e\n\u003cli\u003e1991-1998 FXD\u003c\/li\u003e\n\u003cli\u003e1986-1998 FLST\u003c\/li\u003e\n\u003cli\u003e1984-1998 FLT\u003c\/li\u003e\n\u003cli\u003e1984-1998 FXST\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlease verify fitment before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":47495249920084,"sku":"11-2219","price":252.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0700\/0122\/9908\/files\/11-2219.jpg?v=1786499981","url":"https:\/\/skywaycyclesupply.com\/products\/80-evolution-flat-piston-kit-020","provider":"Skyway Cycle Supply","version":"1.0","type":"link"}