S&S Cycle 4.250" Bore, 4.625" Stroke 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.
Upgrade or refresh your 2017+ Harley-Davidson Milwaukee-Eight engine with this S&S Cycle Cylinder and Piston Kit. Featuring a 4.250-inch bore and 4.625-inch stroke in standard sizing, this kit provides a direct replacement for factory components. Restore or enhance your M8's performance with the proven quality of S&S Cycle engineering.
Why riders pick this
- Standard 4.250" bore, 4.625" stroke sizing
- For 2017 and newer Milwaukee-Eight engines
- Direct replacement for stock pistons and cylinders
- S&S Cycle engineered quality and durability
- Restores or upgrades engine performance
When it's time for a top-end overhaul or a performance boost for your Milwaukee-Eight, this S&S Cycle Cylinder and Piston Kit delivers. Designed to seamlessly replace your stock pistons and cylinders, this kit ensures a precise fit and optimal engine function. S&S Cycle's commitment to quality means you're getting components built for the rigors of V-twin riding, providing reliable power delivery and long-term durability.
Complete Top-End Refresh
- Standard 4.250-inch bore x 4.625-inch stroke sizing
- Engineered for 2017 and newer Milwaukee-Eight (M8) engines
- Direct replacement for factory pistons and cylinders
- S&S Cycle quality construction for dependable performance
Seamless Integration and Power
This kit is engineered to integrate perfectly with your existing M8 engine without requiring extensive modifications to the crankcase for standard applications. It's an ideal choice for riders looking to restore their engine's original specifications or make a solid foundation for future performance upgrades. Ensure proper break-in procedures for optimal longevity and power.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 920-0149
- Bore x Stroke: 4.250 in x 4.625 in
- Sizing: Standard
- Category: Engine Components / Piston Sets - Powersports
- Weight: 3.22 lb
Common questions
Will this kit fit my 2017+ Harley-Davidson Milwaukee-Eight engine?
Yes, this S&S Cycle cylinder and piston kit is designed for all 2017 and newer Harley-Davidson Milwaukee-Eight engines in standard bore and stroke sizing.
Is this a direct replacement for stock pistons and cylinders?
Yes, this kit is engineered to replace factory pistons and cylinders without requiring block modifications for standard Milwaukee-Eight applications.
What's included in this S&S Cycle cylinder and piston kit?
This kit includes pistons and cylinders sized to 4.250-inch bore and 4.625-inch stroke, providing a complete top-end refresh for your Milwaukee-Eight engine.
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 | T14-662032 |
| WEIGHT | 3.22 lb |
