Description
If you’re running a 883cc or 1200cc Big Twin and want genuine displacement gains without a complete engine overhaul, this S&S piston kit delivers 1250cc of additional cubic inches at a proven 10.3:1 compression ratio. The flat-topped design maximizes chamber efficiency while the cast construction offers durability under sustained performance. This is a straightforward bolt-in upgrade that pairs well with your existing heads—or elevates performance further when combined with S&S CNC ported cylinder heads.
- 1250cc displacement upgrade
- 10.3:1 compression ratio
- Cast flat-top pistons
- 1984–1999 HD Big Twins
- Compatible stock 1200cc heads
- 3-9/16″ bore diameter
- Stock 1200cc cylinders compatible
- 1986–2003 883cc cylinders (rebore required)
- S&S CNC heads recommended
- MPN: 106-5556
