S&S CYCLE Piston Kit 106-0434

If you're running a Big Twin and want measurable power gains without an engine swap, displacement increase is one of the most cost-effective paths forward. The S&S CYCLE 1250cc piston kit transforms your 883cc or 1200cc engine into a potent 1250cc mill, delivering more cubic inches where it matters—in the combustion chamber. Pair this with properly ported heads, and you're looking at significant torque and horsepower increases that you'll feel on every ride.

Technical Specifications:

• Displacement increase: 1250cc
• Compression ratio: 10.3:1
• Piston design: Cast flat-top
• Piston bore: 3-9/16"
• Compatible engine platforms: 1984–'99 HD Big Twins
• Works with: Stock 1200cc heads
• Recommended: S&S CNC ported heads
• Compatible 1200cc cylinders: Stock, requires boring
• Compatible 883cc cylinders: 1986–'2003 (requires boring)
• Incompatible: 2004–'16 883cc cylinders
• Installation type: Requires professional machine work
• Material: Cast iron pistons