Ignitions and Electrical› Ignition Boxes and Components
S&S Cycle
S&S Cycle 2017+ M8 Models 129in Big-Bore Kit 4.375in Stroke Highlighted Cylinders
SKU: S0GE 910-0843
Moderate — 2–4 hours
Description
Part #: 910-0843
The biggest Big Bore possible with a slip in kit! This S&S cylinder and piston kit takes your 107" M8 to 129" and the 114" to 132".
129" Wrinkle Black Kit with Highlight
Fitment
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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 910-0843 |
Videos
S&S Cycle Big Bore Kit for Milwaukee-Eight Overview
How to Install a Big Bore Kit In a Milwaukee Eight Engine | Weekend Wrenching
Build Project 1: Harley-Davidson M8 107 to 124 Part 2: Engine Assembly
S&S Big Bore Kits and Cylinder Heads for Harley Review at RevZilla.com
How to Install: S&S Cycle Winter Power Pack (Part 1) Big Bore Kit
S&S 128 High Horsepower UPGRADE KIT By Moonshine Horsepower | Shop Talk Episode 59
S&S 128 Big Bore / Harley-Davidson Lowrider S
S&S Cycle Product Spotlight - Big Bore Cylinder Kits for M8 - 124Hp!
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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