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Product Details

S&S 128" Big Bore Kit For Harley 114" / 117" Milwaukee Eight

Maximize your M8 motor's potential with the ultimate bore size upgrade that requires no case machining. This all-inclusive kit simplifies the pathway to significant power enhancement, ensuring a straightforward installation process.

Features:

  • Bolt-on kit, the largest cylinder bore possible for 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
Made in the USA
Product Style J&P Cycles Item # Catalog Number Store Sku MFR. Product # Availability
Product Style Black Granite w/ Highlighted Fins J&P Cycles Item #10555181 Catalog Number10555181 Store Sku MFR. Product #910-0733A AvailabilityIn Stock: Ships next business day
Product Style Black w/ Highlighted Fins J&P Cycles Item #10555183 Catalog Number10555183 Store Sku MFR. Product #910-0684A AvailabilityIn Stock: Ships next business day
Product Style Black w/ Non Highlighted Fins J&P Cycles Item #10555182 Catalog Number10555182 Store Sku MFR. Product #910-0685A AvailabilityIn Stock: Ships next business day
Please review this product's fitment notes & exceptions prior to purchase: Add to Cart
This product is vehicle specific.
Select a vehicle to ensure fitment.
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 CVO FLTRKSE 2022, 2023
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 Description
Part Numbers
Fitment
4 Customer Reviews for All Models
4 3.5/5
0 Questions & 0 Answers for All Models
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