+.040in. Flat Top Pistons with 9.0:1 Compression Ratio. Fits Sportster 1986-2021 with 1200cc Engine & Sportster 1986-1987 with 1100cc Engine. - Keith Black Pistons Engines and increased performance demands

and increased performance demands

* End oiling

For easy install purchase Switch Wiring extension # NMZ-NHCX-CB14 & Throttle by Wire extension # NMZ-NTBW-J04

Provides reliable power transfer and durable performance within the transmission system

* This tool must be used with the earlier JIMS wheel bearing Installer & Remover Tool # JM-1042

+.040in. Flat Top Pistons with 9.0:1 Compression Ratio. Fits Sportster 1986-2021 with 1200cc Engine & Sportster 1986-1987 with 1100cc Engine. - Keith Black Pistons Engines and increased performance demandsFeatures & Benefits: * Bore = 3. 538" * 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: * 9. 0: 1 Compression Ratio with 69cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufac turers