KB Performance Piston Kit – KB272.005 For Harley Sportster 1986-2022

Description

Manufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and longer piston and ring lifeDiamond-machined pistons are held to plus or minus one gram weight and less than one-half-thousandth-inch (.0005″) tolerances from piston to pistonEach kit contains two pistons, pins, spiral-lock pin clips and Hastings moly ringsReplacement piston rings sold separatelyKB pistons can be installed tighter than other pistons. This results in less piston rock and better ring seal. Please read instructions included with piston for correct piston clearance.Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap. Please read instructions furnished with piston for correct ring installation.SpecsBore Oversize+0.005″Product NamePiston KitPiston Head ShapeReversePiston MaterialHypereutectic AlloyCompression Ratio10.0:1Riding StyleStreetBore Size3.498″UnitsKitPart Notes’08-’18 models require using 1200cc cylinders