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S&S Cycle 129" Big Bore Kit For Harley 107" Milwaukee Eight 2017-2023

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S&S Cycle Big Bore Kit for Milwaukee-Eight Overview

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$1,349^.⁹⁶

$1,544.95

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Blemished/Refurbished

This item is available as a Blem/Refurb. These are items that cannot be sold as "New" merchandise and are limited to stock on hand. See the product details for a description of the product's condition.

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S Cycle 129" Big Bore Kit For Harley 107" Milwaukee Eight 2017-2023 Resources

Instructions.pdf

S&S Cycle 129" Big Bore Kit For Harley 107" Milwaukee Eight

Turn your 107 cubic inch Milwaukee Eight into a 129 cubic inch monster. S&S Cycle has done it again with their bolt-on big bore kit featuring a 4.32” bore and 11:1 compression ratio. This cylinder and piston kit will accommodate a high lift cam and keep your Harley-Davidson M8 happy on pump gas. No case mods, no engine removal; just a massive set of jugs, designed, tested, and manufactured here in the USA.

Features:

Huge bore increase means huge power increase
Works with stock crankcases (no machine work)
Powder coat finish matches factory finish
MLS (multi-layered steel) head gaskets
4.320" Bore
Retains stock engine height
Includes cubic inch cam cover badge
Made in USA

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This product is vehicle specific. Click here to select your vehicle to ensure fitment.

Fitment Notes & Exceptions

Fits models with 107" Milwaukee Eight engines only

Harley Davidson: Electra Glide Standard FLHT 2019, 2020, 2021, 2022; Electra Glide Ultra Classic FLHTCU/I 2017, 2018, 2019; Electra Glide Ultra Limited FLHTK 2017-2023; Electra Glide Ultra Limited Low FLHTKL 2017, 2018, 2019; Revival FLH 2021; Road Glide FLTRX 2017-2023; Road Glide Limited FLTRK 2020, 2021, 2022, 2023; Road Glide Special FLTRXS 2021, 2022, 2023; Road Glide ST FLTRXST 2022, 2023; Road Glide Ultra FLTRU 2017, 2018, 2019; Road King FLHR/I 2017-2022; Softail Breakout FXBR 2018, 2019; Softail Deluxe FLDE 2018, 2019, 2020; Softail Fat Bob FXFB 2018, 2019; Softail Fat Boy FLFB 2018, 2019; Softail Heritage Classic FLHC 2018, 2019, 2020, 2021; Softail Low Rider FXLR 2018, 2019, 2020; Softail Low Rider S FXLRS 2020, 2021, 2022, 2023; Softail Low Rider ST FXLRST 2022, 2023; Softail Slim FLSL 2018, 2019, 2020, 2021; Softail Sport Glide FLSB 2018, 2019, 2020, 2021; Softail Standard FXST 2020, 2021, 2022, 2023; Softail Street Bob FXBB 2018, 2019, 2020; Street Glide FLHX/I 2017-2023; Street Glide Special FLHXS 2021, 2022, 2023; Street Glide ST FLHXST 2022, 2023

Product Style	Item #	Store SKU	Manufacturer Product #	Availability
Product Style Non-Highlighted Fins	Item # 10281738	Store SKU	Manufacturer Product # 910-0844	Availability In Stock: Ships in 1-2 business days
Product Style Highlighted Fins	Item # 10281737	Store SKU	Manufacturer Product # 910-0843	Availability In Stock: Ships in 1-2 business days