Description
If you’re running an 883cc or 1200cc Big Twin and want measurable gains in displacement and power without a complete engine rebuild, the S&S CYCLE Piston Kit 106-5554 delivers a straightforward path to 1250cc performance. This cast flat-topped design increases compression to 10.3:1, extracting more power from each combustion cycle while maintaining reliability on both stock and performance cylinder heads. Whether you’re tuning a vintage 1984-’99 Harley or upgrading an existing 1200cc platform, this kit offers bolt-on displacement gains with proven durability.
- Displacement increase: 1250cc
- Compression ratio: 10.3:1
- Piston design: Cast flat-topped
- Bore diameter: 3-9/16″
- Compatible years: 1984–’99 HD Big Twins
- Works with: Stock or S&S performance heads
- 1200cc cylinders: Bores to 1250cc
- 1986–’03 883cc cylinders: Bores to 1250cc
- 2004–’16 883cc cylinders: Not compatible
- Installation: Cylinder boring required
- S&S CNC ported heads: Recommended upgrade
- MPN: 106-5554
