Engines and Components› Engines, Blocks and Components
S&S Cycle
S&S Cycle 2017+ M8 Models 4.250in Bore x 4.5in Stroke 114 To 128 Big Bore Kit
SKU: S0GE 910-0684
Advanced — 4+ hours
Description
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | S&S Cycle |
| Part Number | S0GE 910-0684 |
Videos
S&S Cycle Big Bore Kit for Milwaukee-Eight Overview
Build Project 1: Harley-Davidson M8 107 to 124 Part 2: Engine Assembly
107 to 128 Harley-Davidson Engine Kit!
S&S Cycle Product Spotlight - Big Bore Cylinder Kits for M8 - 124Hp!
S&S 128 Big Bore / Harley-Davidson Lowrider S
How to Install: S&S Cycle Winter Power Pack (Part 1) Big Bore Kit
WATCH THIS BEFORE YOU UPGRADE TO A 124 OR 128 BIG BORE KIT ON YOUR M8 HARLEY DAVIDSON
S&S 128 High Horsepower UPGRADE KIT By Moonshine Horsepower | Shop Talk Episode 59
HARLEY DAVIDSON SE 128 BIG BORE KIT INSTALL IN MADMAX ROAD GLIDE #cyclefanatix #harleydavidson
2023 ST 132″ Big-Bore kit
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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