S&S Cycle 4.320" Bore Piston Ring Set (2-Pack) - 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.
Ensure peak compression and oil control in your Milwaukee-Eight engine with this S&S Cycle Piston Ring Set. Designed for 4.320 inch bore M8 engines, these rings are crucial for maintaining optimal performance during a rebuild or refresh. This 2-pack offers convenience for shops or riders undertaking multiple engine projects.
Why riders pick this
- For 4.320 inch bore Milwaukee-Eight engines
- Restores compression and oil control
- OEM-replacement specification
- Convenient 2-pack for multiple builds
A critical component in any engine rebuild, this S&S Cycle Piston Ring Set is engineered to OEM-replacement specifications for 2017 and newer Harley-Davidson Milwaukee-Eight engines. Proper ring seating is vital for maximizing horsepower and preventing oil consumption, and S&S delivers the quality you expect for your M8 powerplant. This convenient 2-pack provides value for those working on multiple engines or keeping spares on hand.
Precision Engineering for M8 Performance
- Designed for 4.320 inch bore Milwaukee-Eight engines
- Restores lost compression and improves oil control
- OEM-replacement specification for reliable performance
- Convenient 2-pack for multiple engine builds or spares
The Foundation of a Strong M8
Whether you're refreshing a high-mileage engine or completing a full performance build, new piston rings are a non-negotiable item. These S&S rings are precision-manufactured to integrate seamlessly with your 4.320 inch bore Milwaukee-Eight pistons. Always verify your piston's bore diameter matches before ordering to ensure correct fitment and optimal engine function.
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 940-0067
- Bore Size: 4.320 in.
- Quantity: 2 per pack
- Weight: 0.18 lb
- Category: Engine Components / Piston Rings
Common questions
Are these piston rings compatible with my Twin Cam engine?
No, this S&S Cycle piston ring set is specifically designed for 2017 and newer Milwaukee-Eight (M8) engines with a 4.320 inch bore. Twin Cam engines require different ring specifications.
Do I need new pistons to install these rings?
Piston rings are typically installed on existing pistons during an engine rebuild. You should verify your current piston bore diameter matches 4.320 inches to ensure proper fitment.
Why are these piston rings sold in a 2-pack?
The 2-pack quantity is ideal for professional shops or riders who are rebuilding multiple Milwaukee-Eight engines, or simply want to have a spare set on hand.
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 Rings |
| SKU | T14-662044 |
| WEIGHT | 0.18 lb |
