Piston Kit Namura Z50R 79-99 XR50 XR50F 00-03 CRF50 04-17 1.5mm Oversize 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 developed for the highest level of quality Unsurpassed in functionality and reliability Ready to serve reliably for years to come Includes: Pistons Rings Circlips Honda CRF50F 2004-2009, 2011-2016 XR50 2000-2003 Z50 1979-1989, 1991-1999 Z50R 1990