Std Dome Top Pistons with 10.5:1 Compression Ratio. Fits Big Twin 1984-1999 with Evo Engine. CM-2200-1 * ECE approved

* ECE approved

Sportster XL1200X 2010-2015

* Anodized Black Finish

* Aside from being one of the more functional accessories available

* Replaces OEM # 27421-99

Std Dome Top Pistons with 10.5:1 Compression Ratio. Fits Big Twin 1984-1999 with Evo Engine. CM-2200-1 * ECE approvedFeatures & Benefits: * Bore = 3. 498" * Stroke = 4. 250" * Hypereutectic Alloy is a cast 16% silicon content material. * Perfect for air cooled engines. * Low thermal expansion rate = tighter piston to cylinder clearance. * Complete kit includes: two pistons, rings, wrist pins and clips. Tech Tips: * 10. 5: 1 Compression Ratio with 80cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers