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My Store
Open Today At 10am
3635 West Broad Street
Columbus, Ohio 43228
614-869-3115
What’s going on at Cycle Gear
Services
Experienced staff support available on site
Store Events
Meet the local riding community for Bike Nights & more
Shop the Store
Find out what’s in stock and ready to go
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Uh oh - Our system doesn't think this part will fit your 2022 Triumph Bonneville Street Twin (change vehicle selection)

S&S 128" Big Bore Kit For Harley 114" Milwaukee Eight

Upgrade your 114" M8 motor to the largest bore size possible, without required machining of your cases. This is as simple as big power gets, with everything necessary for installation included.

Features:

  • Bolt-on kit, the largest cylinder bore possible for 114" M8 motors without required machining of the crankcases
  • 4.250" bore, 4.500" stroke
  • 11:1 forged pistons with rings, pins and clips
  • All gaskets and hardware required for installation included
  • Made in the USA
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Please review this product's fitment notes & exceptions prior to purchase: Add to Cart

Uh oh - Our system doesn't think this part will fit your 2022 Triumph Bonneville Street Twin (change vehicle selection)

Fitment Notes & Exceptions
  • Fits models with 114" Milwaukee Eight motor only

This Product Fits:


Harley Davidson
Electra Glide Ultra Limited CVO/SE FLHTKSE 2017, 2018, 2019, 2020, 2021
Electra Glide Ultra Limited FLHTK 2020, 2021, 2022, 2023, 2024
Road Glide CVO/SE FLTRXSE 2018, 2019, 2020, 2021, 2022
Road Glide Limited FLTRK 2020, 2021, 2022, 2023, 2024
Road Glide Special FLTRXS 2019, 2020, 2021, 2022, 2023
Road Glide ST FLTRXST 2022, 2023
Road King Special FLHRXS 2020-2025
Softail Breakout 114 FXBRS 2018, 2019, 2020
Softail Breakout 117 FXBR 2023, 2024, 2025
Softail Fat Bob 114 FXFBS 2018-2023
Softail Fat Boy 114 FLFBS 2018-2024
Softail Fat Boy FLFB 2025
Softail FXDR 114 FXDRS 2019, 2020
Softail Heritage Classic 114 FLHCS 2018-2024
Softail Heritage Classic FLHC 2025
Softail Low Rider S FXLRS 2020-2025
Softail Low Rider ST FXLRST 2022, 2023, 2024, 2025
Street Glide CVO/SE FLHXSE 2017-2022
Street Glide Special FLHXS 2019, 2020, 2021, 2022, 2023
Street Glide ST FLHXST 2022, 2023
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Black w/ Highlighted Fins Item # 1591335 Store SKU Manufacturer Product # 910-0684 Availability Only 1 Left: Ships within 24 hours
Product Style Black w/ No Highlight Item # 1591334 Store SKU Manufacturer Product # 910-0685 Availability In Stock: Ships next business day
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