S&S Cycle 4.250-inch Bore Front 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.
This S&S Cycle front cylinder and piston kit is engineered for 2017 and newer Harley-Davidson Milwaukee-Eight (M8) engines, providing a significant performance upgrade. Featuring a 4.250-inch bore and a perfectly matched piston, this kit is built to OEM-quality standards, ensuring reliable power delivery for your modern V-twin platform.
Why riders pick this
- 4.250-inch bore front cylinder for increased displacement
- Includes a matched piston for seamless integration
- Designed specifically for 2017+ Milwaukee-Eight engines
- OEM-quality engineering from S&S Cycle
When you're ready to uncork more power from your Milwaukee-Eight, this S&S Cycle front cylinder and piston kit provides a direct path to increased displacement. The 4.250-inch bore cylinder, paired with its specifically designed piston, ensures optimal combustion and improved engine efficiency. It's a crucial component for any M8 owner looking to elevate their ride's performance without compromising on quality or fitment.
Engineered for Milwaukee-Eight Performance
- Features a 4.250-inch bore front cylinder for enhanced displacement
- Includes a precisely matched piston for optimal performance and fit
- Specifically designed for 2017 and newer Milwaukee-Eight (M8) engines
- Built with S&S Cycle's renowned OEM-quality engineering for reliability
A Foundation for Your M8 Power Upgrade
This front cylinder and piston kit is more than just replacement parts; it's a performance upgrade. By increasing the bore, you're laying the groundwork for greater horsepower and torque output. It's an ideal choice for riders who want to improve their M8's capabilities, whether as part of a larger stage kit or as a standalone enhancement. Ensure you pair it with the correct rear cylinder kit for a complete top-end overhaul.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 910-0734
- Bore Size: 4.250 inch
- Position: Front cylinder
- Application: 2017+ Milwaukee-Eight (M8)
- Weight: 1 lb
- Category: Engine Components / Piston Sets
Common questions
Will this fit my Twin Cam Harley-Davidson?
No, this S&S Cycle kit is engineered specifically for 2017 and newer Milwaukee-Eight (M8) engines. Twin Cam owners will need a different S&S Cycle bore kit designed for their platform.
What is included in this kit?
This kit includes the front cylinder assembly and a matched piston, both designed for optimal performance on the Milwaukee-Eight platform.
Do I need a rear cylinder kit too?
This product is a front cylinder and piston kit only. You will need to order the matching rear cylinder and piston separately if you intend to upgrade both cylinders for a complete top-end.
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 | T14-662018 |
| WEIGHT | 1.0 lb |