Description
If you’re running an 883cc or 1200cc Big Twin and want measurable power gains without a complete engine rebuild, this S&S piston kit delivers a straightforward path to 1250cc displacement and a meaningful bump in output. The 10.3:1 compression ratio strikes a balance between performance and reliability on pump fuel, while the cast flat-top design provides proven durability across thousands of miles. Pair these pistons with S&S CNC ported heads for optimal results, or run them with stock 1200cc heads if your budget doesn’t allow it.
- Displaces 1250cc
- 10.3:1 compression ratio
- Cast flat-top design
- 3-9/16″ bore diameter
- Fits 1984–1999 HD Big Twins
- Compatible with stock or S&S heads
- Works with stock 1200cc cylinders
- Works with 1986–2003 883cc cylinders
- Requires boring for fitment
- Not compatible with 2004–2016 883cc cylinders
- Bolt-on installation (boring required)
- S&S CNC ported heads recommended
- MPN: 106-4414
