128" Power Package — 4.250" bore, 4.500" stroke

S&S CYCLE 128" Power Package — 4.250" bore, 4.500" stroke – 18-25 Softail, 21, 24-25 Touring, 17-25 Trike

S&S CYCLE
0904-0129
310-1109C

Complete bolt-in big bore kit with forged pistons and included components for a substantial power increase.

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€3,700.91
€4,464.56
Save €763.65
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Transform your engine with the 128" Power Package — a complete bolt-in big bore upgrade that delivers serious on-road performance. ⚙️

  • 114" to 128" big bore kit; 114" and 117" CVO to 128" big bore kit
  • Bolt-in kit, case machining not required
  • Forged pistons for long-lasting strength
  • Includes oil pump/cam plate, pushrods with chrome covers, tappets, tappet cuffs, S&S 550 camshaft, and valve springs
  • Not for 121" CVO models

Kit is designed for a straightforward installation with included components; professional installation recommended. 🔧

Delivering proven power gains while retaining reliable street manners.

: 0904-0129
In Stock

Data sheet

Units
Kit
Color/Finish
Highlighted Fins, Black Granite
Brand
S&S CYCLE
Bore Size
4,250"
Displacement
128"
Cooling System
Oil Cooled
Stroke Length
4,500"
Compression Ratio
11.1:1
Cam Drive Type
Chain

This product fits the following vehicles. Use the filters below to narrow down the list if needed.

Manufacturer Model Family Year Notes
Harley Davidson Softail Deluxe 107 Softail 2019
Harley Davidson Softail Deluxe 107 Softail 2020
Harley Davidson Softail Fat Boy 107 Softail 2018
Harley Davidson Softail Fat Boy 107 Softail 2020
Harley Davidson Softail Fat Boy Anniversary (ANX) 114 Softail 2018
Harley Davidson Softail Fat Boy 114 Softail 2019
Harley Davidson Softail Fat Boy 114 Softail 2020
Harley Davidson Softail Fat Boy 114 Softail 2021
Harley Davidson Softail Fat Boy 114 Softail 2022
Harley Davidson Softail Fat Boy 114 Softail 2023
Harley Davidson Softail Fat Boy 114 Softail 2024
Harley Davidson Softail Fat Boy 117 Softail 2025
Harley Davidson Electra Glide Revival 114 Touring 2021
Harley Davidson Softail Heritage Classic 107 Softail 2019
Harley Davidson Softail Heritage Classic 107 Softail 2020
Harley Davidson Softail Heritage Classic 107 Softail 2021
Harley Davidson Softail Heritage Classic 107 Softail 2022
Harley Davidson Softail Heritage Classic 114 Softail 2019
Harley Davidson Softail Heritage Classic 114 Softail 2020
Harley Davidson Softail Heritage Classic 114 Softail 2021
Harley Davidson Softail Heritage Classic 114 Softail 2022
Harley Davidson Softail Heritage Classic 114 Softail 2023
Harley Davidson Softail Heritage Classic 114 Softail 2024
Harley Davidson Softail Heritage Classic 117 Softail 2025
Harley Davidson Road King Special 114 Touring 2025
Harley Davidson Street Glide 117 Touring 2024
Harley Davidson Street Glide 117 Touring 2025
Harley Davidson Hydra-Glide Revival 114 Softail 2024
Harley Davidson Freewheeler 107 Trike 2017
Harley Davidson Freewheeler 107 Trike 2018
Harley Davidson Freewheeler 107 Trike 2019
Harley Davidson Freewheeler 114 Trike 2020
Harley Davidson Freewheeler 114 Trike 2021
Harley Davidson Freewheeler 114 Trike 2022
Harley Davidson Freewheeler 114 Trike 2023
Harley Davidson Freewheeler 114 Trike 2024
Harley Davidson Freewheeler 114 Trike 2025
Harley Davidson Softail Sport Glide 107 Softail 2019
Harley Davidson Softail Sport Glide 107 Softail 2020
Harley Davidson Softail Sport Glide 107 Softail 2021
Harley Davidson Softail Sport Glide 107 Softail 2022
Harley Davidson Softail Sport Glide 107 Softail 2023
Harley Davidson Softail Sport Glide 107 Softail 2024
Harley Davidson Softail Slim 107 Softail 2018
Harley Davidson Softail Slim 107 Softail 2020
Harley Davidson Softail Slim 107 Softail 2021
Harley Davidson Softail Fat Boy Gray Ghost 117 Softail 2025
Harley Davidson Road Glide 3 114 Trike 2023
Harley Davidson Road Glide 3 114 Trike 2024
Harley Davidson Road Glide 3 114 Trike 2025
Harley Davidson Road Glide 117 Touring 2024
Harley Davidson Road Glide 117 Touring 2025
Harley Davidson Softail Street Bob 107 Softail 2020
Harley Davidson Softail Street Bob 117 Softail 2025
Harley Davidson Softail Street Bob 114 Softail 2021
Harley Davidson Softail Street Bob 114 Softail 2021
Harley Davidson Softail Street Bob 114 Softail 2022
Harley Davidson Softail Street Bob 114 Softail 2023
Harley Davidson Softail Street Bob 114 Softail 2024
Harley Davidson Softail Breakout 107 Softail 2018
Harley Davidson Softail Breakout 107 Softail 2019
Harley Davidson Softail Breakout 107 Softail 2020
Harley Davidson Softail Breakout 117 Softail 2023
Harley Davidson Softail Breakout 117 Softail 2024
Harley Davidson Softail Breakout 117 Softail 2025
Harley Davidson Softail Breakout Anniversary (ANX) 114 Softail 2018
Harley Davidson Softail Breakout 114 Softail 2020
Harley Davidson Softail Breakout 114 Softail 2021
Harley Davidson Softail Breakout 114 Softail 2022
Harley Davidson Softail King 114 Softail 2019
Harley Davidson Softail King 114 Softail 2020
Harley Davidson Softail Fat Bob 107 Softail 2018
Harley Davidson Softail Fat Bob 107 Softail 2019
Harley Davidson Softail Fat Bob 107 Softail 2021
Harley Davidson Softail Fat Bob 114 Softail 2019
Harley Davidson Softail Fat Bob 114 Softail 2020
Harley Davidson Softail Fat Bob 114 Softail 2021
Harley Davidson Softail Fat Bob 114 Softail 2022
Harley Davidson Softail Fat Bob 114 Softail 2023
Harley Davidson Softail Low Rider 107 Softail 2019
Harley Davidson Softail Low Rider 107 Softail 2020
Harley Davidson Softail Low Rider S 114 Softail 2020
Harley Davidson Softail Low Rider S 114 Softail 2021
Harley Davidson Softail Low Rider S 117 Softail 2022
Harley Davidson Softail Low Rider S 117 Softail 2023
Harley Davidson Softail Low Rider S 117 Softail 2024
Harley Davidson Softail Low Rider S 117 H.O. Softail 2025
Harley Davidson Softail Low Rider ST EL Diablo 117 Softail 2022
Harley Davidson Softail Low Rider ST 117 Softail 2023
Harley Davidson Softail Low Rider ST 117 Softail 2024
Harley Davidson Softail Low Rider ST 117 H.O. Softail 2025
Harley Davidson Softail Standard Softail 2021
Harley Davidson Softail Standard Softail 2020
Harley Davidson Softail Standard Softail 2021
Harley Davidson Softail Standard Softail 2022
Harley Davidson Softail Standard Softail 2023
Harley Davidson Softail Standard Softail 2024