Description
Looking to unlock genuine displacement gains from your Big Twin? The S&S Cycle 1250cc Piston Kit delivers a straightforward path to increased cubic inches, higher compression, and measurable power improvements without requiring complete engine redesign. Whether you’re building a stock-headed cruiser or pairing these pistons with S&S performance heads, this kit gives you the displacement advantage serious riders demand.
This is a bolt-on displacement upgrade engineered for 1984–1999 HD Big Twins. The cast flat-topped pistons are precision-manufactured to exact tolerances and work seamlessly with your existing cylinder and head combination—though proper cylinder boring and head selection are critical for optimal results.
- Increases displacement to 1250cc
- 10.3:1 compression ratio
- Cast flat-topped design
- 3-9/16″ bore diameter
- Compatible with 1984–1999 Big Twins
- Works with stock 1200cc heads
- S&S CNC heads recommended
- Requires cylinder boring
- Stock 1200cc cylinders compatible
- 1986–2003 883cc cylinders compatible
- 2004–2016 883cc cylinders NOT compatible
- Complete piston kit included
