S&S Cycle 4.250" Bore Piston Set - 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.
Unleash the potential of your 2017 and newer Harley-Davidson Milwaukee-Eight engine with this S&S Cycle Piston Set. Engineered with a 4.250-inch bore and 4.500-inch stroke, these pistons are designed as a direct replacement for stock or mildly modified M8 builds. Experience the quality construction and precise fitment that S&S Cycle is known for in the V-twin performance world.
Why riders pick this
- For 2017 and newer Milwaukee-Eight engines
- Standard 4.250-inch bore, 4.500-inch stroke
- Direct replacement for stock or mildly modified M8
- S&S Cycle quality construction for durability
- Optimizes engine compression and performance
When it's time to refresh or upgrade the heart of your Milwaukee-Eight, S&S Cycle piston sets offer the reliability and performance you expect. These pistons are crafted to exacting standards, ensuring optimal compression and durability for the demands of the road. Whether you're maintaining a factory setup or making mild performance enhancements, these S&S pistons provide a solid foundation for your M8 engine.
Precision Engineering for M8 Power
- Designed specifically for 2017 and newer Milwaukee-Eight engines
- Standard 4.250-inch bore and 4.500-inch stroke sizing
- Ideal for stock replacement or mildly modified engine configurations
- Built with S&S Cycle's renowned quality construction
Build with Confidence
Proper piston installation is crucial for engine longevity and performance. These S&S Cycle pistons are ready for installation into your Milwaukee-Eight engine, providing a dependable solution for your rebuild. Always ensure your cylinders are properly prepared and honed to spec to achieve the best piston ring seal and overall engine health.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 920-0140
- Weight: 3.22 lb
- Category: Engine Components / Piston Sets - Powersports
Common questions
Will this piston set fit my Twin Cam Harley-Davidson engine?
No, this S&S Cycle piston set is specifically designed for 2017 and newer Harley-Davidson Milwaukee-Eight engines only. Twin Cam models require a different part number.
Are these pistons intended for stock replacement or high-performance builds?
These pistons feature standard bore and stroke sizing, making them suitable for stock replacement or mildly modified Milwaukee-Eight engine builds.
Do I need to hone the cylinders when installing new pistons?
Yes, proper cylinder preparation, including honing to specification, is essential for achieving optimal piston ring seal and ensuring long engine life. It is highly recommended.
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 | T14-662030 |
| WEIGHT | 3.22 lb |
