Namura OEM Style Piston Kit 1.50MM NA-40004-6 fits 1991-1995 Yamaha XT600 / 2004-2007 RHINO 660 YXR660FA 4X4 / 2006 RHINO 660 YXR660FASE 4X4 Special Edition / 2006-2007 RHINO 660 YXR660FAEX 4X4 Exploring Edition

MOS2 (Teflon/Molybdenum) Coated Skirts - A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizuresMachined Smooth Heads - Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%Anodized Domes - Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistonsHypereutectic Casting Process - Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures