PISTON KIT NAMURA KX65 00-20 RM65 03-07 44.45MMPiston Kit Namura KX65 00 20 RM65 03 07 44. 45mm Features: Machined smooth piston crown to reflect combustion heat while reducing carbon buildup Hard anodized piston crown with a hardness of HRB 105 MOS2 coating to draw heat through piston walls and out the bottom Minimized piston expansion and contraction Pistons are more resistant to wear and scuffing, expand less with heat and are stronger Higher Performance piston without a higher price Carefully