Std Flat Top Pistons with 9.1:1 Compression Ratio. Fits Sportster 1986-2003 with Big Bore 883cc to 1200cc Conversion. - Keith Black Pistons Cylinder Heads & Components * New redesigned exclusive Kevlar

* New redesigned exclusive Kevlar air spring technology provides spring rate adjustability

Install rocker arms/shafts

Dyna 1991-2005 (Exc FXDWG)Require:

* Low profile heel shifter

Std Flat Top Pistons with 9.1:1 Compression Ratio. Fits Sportster 1986-2003 with Big Bore 883cc to 1200cc Conversion. - Keith Black Pistons Cylinder Heads & Components * New redesigned exclusive KevlarFeatures & Benefits: * Bore = 3. 498 * Stroke = 3. 812 * 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: * Piston is 0. 125 below deck to achieve 9. 1: 1 Compression. * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers