Bore: 65.97mmSizing: 0.50mm OversizeMOS2 (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 seizures. Machined 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 pistons. Hypereutectic Casting Process - Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures.This item fits the following vehicle applications:compatible with Honda ATC200 1981-1983compatible with Honda ATC200E 1982-1983compatible with Honda ATC200ES 1984compatible with Honda ATC200M 1984-1985compatible with Honda ATC200S 1984-1986compatible with Honda ATC200X 1983-1986compatible with Honda TRX200 1984compatible with Honda TRX200D FourTrax Type II 1991-1997compatible with Honda TRX200SX 1986-1988compatible with Honda XR200 1980-1984compatible with Honda XR200R 1981-2002