S&S Cycle 131 CI Big Bore Cylinder & Piston Kit - Harley Milwaukee-Eight
About S&S Cycle
S&S Cycle has built American V-twin performance parts in Viola, Wisconsin since 1958 — flywheels, carburetors, cams, cylinder heads and complete crate engines. When a Harley owner talks about a 124, a 128 or a 131 build, they are usually talking about S&S. Few names carry more weight with engine builders in this space.
Elevate your 2017-later Harley-Davidson Milwaukee-Eight big twin to a powerful 131 cubic inches with this S&S Cycle cylinder and piston kit. Engineered for significant displacement and power gains, this kit is a serious upgrade for performance-minded riders.
Why riders pick this
- Achieves 131 CI with S&S stroker flywheels
- Forged piston design for durability
- 4.25-inch cylinders increase bore
- Powder coat matches factory finish
- Works with stock crankcases
- Retains stock engine height
The S&S Cycle 131 cubic-inch cylinder and piston kit is designed to unlock extreme power from your 2017 and newer Milwaukee-Eight engine. This kit delivers substantial displacement, providing a robust foundation for building a high-performance V-twin. While the cylinders and forged pistons are a crucial part of the upgrade, achieving the full 131 cubic inches requires pairing them with S&S stroker flywheels and a compatible crank.
Engineered for Maximum Displacement
- Designed for a full 131 cubic-inch displacement with S&S stroker flywheels
- Features durable forged pistons for high-stress applications
- 4.25-inch cylinders deliver increased bore for greater capacity
- Powder coat finish is designed to match your factory engine appearance
- Includes 0.030-inch MLS head gaskets for a reliable seal
- Retains stock engine height and original engine serial numbers
Building a Big-Inch M8
This S&S Cycle kit is a core component for riders aiming for maximum displacement and power from their Milwaukee-Eight. It allows you to retain your stock crankcases and engine height, simplifying the build while still achieving massive gains. For optimal performance and to reach the full 131 CI, ensure you integrate this kit with the recommended S&S stroker flywheels and a proper dyno tune.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 910-0762A
- Category: Engine Components / Piston Sets - Powersports
- Weight: 27.06 lb
Common questions
What displacement will this kit achieve on my Milwaukee-Eight?
This kit is designed to achieve 131 cubic inches when paired with S&S stroker flywheels and a compatible crank. With a stock stroke, the displacement will be less.
Does this require machining of my crankcases?
No, this S&S Cycle kit is engineered to work with stock crankcases, meaning no machining is required for installation.
What else do I need to reach 131 cubic inches with this kit?
To achieve the full 131 cubic-inch displacement, this kit requires S&S stroker flywheels (part numbers ssc320-0605 or ssc320-0620) and a compatible crank.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | S&S Cycle |
| TYPE | Piston Sets - Powersports |
| SKU | T14-852162 |
| WEIGHT | 27.06 lb |