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S&S CYCLE Cylinder Kit – 128″ Big Bore – Wrinkle Black w/o Highlight – 114″/117″ M8 – Harley-Davidson ’17-’25 – 910-0685A

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  • S&S CYCLE Cylinder Kit – 128″ Big Bore – Wrinkle Black w/o Highlight – 114″/117″ M8 – Harley-Davidson ’17-’25 – 910-0685A
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S&S CYCLE Cylinder Kit – 128″ Big Bore – Wrinkle Black w/o Highlight – 114″/117″ M8 – Harley-Davidson ’17-’25 – 910-0685A

  • $2,002.41 $145.00
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Features & Benefits

  • Available for 114 M8 models
  • Available in both highlighted and non highlighted versions
  • 114 to 128″ big bore kit
  • Wrinkle black finish
  • Non-Highlighted Fins
  • Bolt on kit. No Machining Required
  • includes gaskets and hardware required for installation
  • 4.250″ bore
  • Forged Pistons
  • 11:1 compression ratio

***We recommend using S&S Cycle Head Bolts for M8, part number 900-1006 for all big bore applications.

  • Project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.
Fitment Guide
2025 Harley-Davidson Softail Fat Boy FLFB – –
2025 Harley-Davidson Street Glide EFI FLHX – –
2025 Harley-Davidson Softail Breakout FXBR – –
2025 Harley-Davidson Softail Low Rider S FXLRS – –
2025 Harley-Davidson FLHXU Street Glide Ultra – –
2025 Harley-Davidson Softail Low Rider ST FXLRST – –
2025 Harley-Davidson Road Glide Custom FLTRX – –
2025 Harley-Davidson Softail Heritage Classic FLHC – –
2024-2025 Harley-Davidson Road Glide Police FLTRXP – –
2024 Harley-Davidson FLI Hydra-Glide Revival – –
2023-2025 Harley-Davidson FXBR Breakout 117 – –
2023 Harley-Davidson FLHFB Electra Glide Highway King – –
2022-2025 Harley-Davidson FXLRS Low Rider S 117 – –
2022-2025 Harley-Davidson FXLRST Low Rider ST 117 – –
2022-2023 Harley-Davidson FLHXST Street Glide ST – –
2022-2023 Harley-Davidson FLTRKSE CVO Road Glide Limited – –
2022-2023 Harley-Davidson FLTRXST Road Glide ST – –
2022,2025 Harley-Davidson Softail Street Bob FXBB – –
2022 Harley-Davidson FXRST Low Rider El Diablo 117 – –
2021-2024 Harley-Davidson FXBBS Street Bob 114 – –
2021 Harley-Davidson FLH Electra Glide Revival – –
2020-2024 Harley-Davidson FLTRK Road Glide Limited – –
2020-2021 Harley-Davidson FXLRS Low Rider S 114 – –
2019-2022 Harley-Davidson FLHT Electra Glide Standard – –
2019-2020 Harley-Davidson FXDRS FXDR 114 – –
2018-2024 Harley-Davidson FLFBS Fat Boy 114 – –
2018-2024 Harley-Davidson FLHCS Heritage Classic 114 – –
2018-2023 Harley-Davidson FXFBS Fat Bob 114 – –
2018-2020 Harley-Davidson FXBRS Breakout 114 – –
2017-2025 Harley-Davidson FLHRXS Road King Special – –
2017-2025 Harley-Davidson FLHX Street Glide – –
2017-2025 Harley-Davidson FLTRX Road Glide – –
2017-2025 Harley-Davidson Electra Glide Police FLHTPI – –
2017-2025 Harley-Davidson Road King Police FLHP – –
2017-2024 Harley-Davidson FLHTK Ultra Limited – –
2017-2023 Harley-Davidson FLHXS Street Glide Special – –
2017-2023 Harley-Davidson FLHXSE CVO Street Glide – –
2017-2023 Harley-Davidson FLTRXS Road Glide Special – –
2017-2022 Harley-Davidson FLHR Road King – –
2017-2021 Harley-Davidson FLHTKSE CVO Limited – –
2017-2019 Harley-Davidson FLHTKL Ultra Limited Low – –
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic – –
2017-2019 Harley-Davidson FLTRU Road Glide Ultra – –
Specs
Product Name Cylinder Kit
Style Bolt-On
Model Big Bore
Color/Finish Non-Highlighted Fins / Wrinkle Black
Bore Size 4.25″
Displacement 128″
Stroke Length 4.500″
Compression Ratio 11.0:1
Units Kit
Riding Style Street

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