{"product_id":"j-e-pistons-391730-powersports-ultra-series-piston-kit-0-07in-oversized-to-4-39in-11-25-1-compression","title":"J.E. Pistons 391730 Powersports Ultra Series Piston Kit - 0.07in Oversized to 4.39in. - 11.25:1 Compression","description":"Bore: 4.32in.\u003cbr\u003e Compression: 11.25:1 Compression\u003cbr\u003e Sizing: 0.070in. Oversize\u003cbr\u003e\u003cbr\u003eIn-house forging has allowed JE to develop proprietary Aligned Grain Flow Technology forging technology that directs the grain flow of the aluminum to flow around critical areas of the piston, increasing strength. Lateral gas ports channel combustion gases to the back of the top ring groove, which adds pressure behind the compression ring to keep it pushed against the cylinder, providing improved and more consistent ring seal, critical in boosted applications. Ultra-thick ring lands aid in maintaining ring stability in forced induction and high-horsepower N\/A engines, contributing to consistent ring seal and consistent power. Thermal Barrier Crown Coating - a ceramic coating on the piston crown - greatly reduces heat transfer into the piston material, decreasing fatigue and improving longevity. Tuff Skirt - a proprietary, moly-based dry film skirt coating is applied in-house and reduces operating friction for better wear resistance. Accumulator groove provides additional volume to trap unwanted gases below the top ring to keep pressure low and ring seal and performance high. Double pin oilers - two oil channels feed into the pin bore to maintain proper lubrication to improve wrist pin and pin bore wear resistance. Includes upgraded 9310 wrist pins: stronger, thicker wrist pin material is designed to withstand additional loads of forced induction applications. Sold as a complete kit with all necessary pistons, rings, wrist pins and wire locks under one part number.\u003cbr\u003e\u003cbr\u003eVehicle Fitment:\u003cbr\u003e\u003cbr\u003e2018-2020 Harley Davidson FLDE Deluxe 107\u003cbr\u003e 2018-2019 Harley Davidson FLFB Fat Boy 107\u003cbr\u003e 2018-2024 Harley Davidson FLFBS Fat Boy 114\u003cbr\u003e 2021 Harley Davidson FLH Electra Glide Revival\u003cbr\u003e 2018-2021 Harley Davidson FLHC Heritage Classic 107\u003cbr\u003e 2018-2024 Harley Davidson FLHCS Heritage Classic 114\u003cbr\u003e 2023 Harley Davidson FLHFB Electra Glide Highway King\u003cbr\u003e 2017-2024 Harley Davidson FLHRXS Road King Special\u003cbr\u003e 2017-2024 Harley Davidson FLHTK Ultra Limited\u003cbr\u003e 2017-2019 Harley Davidson FLHTKL Ultra Limited Low\u003cbr\u003e 2017-2023 Harley Davidson FLHXS Street Glide Special\u003cbr\u003e 2022-2023 Harley Davidson FLHXST Street Glide ST\u003cbr\u003e 2024 Harley Davidson FLI Hydra-Glide Revival\u003cbr\u003e 2018-2021 Harley Davidson FLSB Sport Glide 107\u003cbr\u003e 2018-2021 Harley Davidson FLSL Softail Slim 107\u003cbr\u003e 2020-2024 Harley Davidson FLTRK Road Glide Limited\u003cbr\u003e 2017-2019 Harley Davidson FLTRU Road Glide Ultra\u003cbr\u003e 2017-2024 Harley Davidson FLTRX Road Glide\u003cbr\u003e 2017-2023 Harley Davidson FLTRXS Road Glide Special\u003cbr\u003e 2022-2023 Harley Davidson FLTRXST Road Glide ST\u003cbr\u003e 2018-2020 Harley Davidson FXBB Street Bob 107\u003cbr\u003e 2018-2019 Harley Davidson FXBR Breakout 107\u003cbr\u003e 2023-2024 Harley Davidson FXBR Breakout 117\u003cbr\u003e 2018-2020 Harley Davidson FXBRS Breakout 114\u003cbr\u003e 2019-2020 Harley Davidson FXDRS FXDR 114\u003cbr\u003e 2018-2019 Harley Davidson FXFB Fat Bob 107\u003cbr\u003e 2018-2023 Harley Davidson FXFBS Fat Bob 114\u003cbr\u003e 2018-2020 Harley Davidson FXLR Low Rider 107\u003cbr\u003e 2020-2021 Harley Davidson FXLRS Low Rider S 114\u003cbr\u003e 2022-2024 Harley Davidson FXLRS Low Rider S 117\u003cbr\u003e 2022-2024 Harley Davidson FXLRST Low Rider ST 117\u003cbr\u003e 2022 Harley Davidson FXRST Low Rider El Diablo 117\u003cbr\u003e 2020-2024 Harley Davidson FXST Softail Standard 107","brand":"J.E. Pistons","offers":[{"title":"Default Title","offer_id":44028951756922,"sku":"8748026","price":729.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0004\/3312\/7455\/files\/496182e6890e4ded93af0ec33da80d24_c8e7622c-1af6-461f-927c-100d2019b4c8.jpg?v=1753426938","url":"https:\/\/www.powersportsuperstore.com\/products\/j-e-pistons-391730-powersports-ultra-series-piston-kit-0-07in-oversized-to-4-39in-11-25-1-compression","provider":"Powersport Superstore","version":"1.0","type":"link"}