{"product_id":"883cc-conversion-piston-set-040-oversize","title":"883cc Conversion Piston Set .040 Oversize","description":"\u003cp\u003eKeith Black dish piston set is .040 oversize with a 9.0:1 compression ratio for 1986-up XL Evolution models.\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 over sized  for a 3.498 inch bore and has a 9:1 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. 2009-UP XL 883 cylinders cannot be overboard to 1200cc. 2009-UP applications will require separate purchase of 1200cc cylinders to be used with piston kit.  **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 Conversion Piston Guide and Fitment.pdf\u003c\/p\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":67622839091385,"sku":"11-2233","price":261.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0775\/0179\/2441\/files\/11-2233.jpg?v=1790864465","url":"https:\/\/www.thespeedshopusa.com\/products\/883cc-conversion-piston-set-040-oversize","provider":"THE SPEED SHOP USA","version":"1.0","type":"link"}