Moose Offroad Piston Kit Piston Kit - 66.35 mm - Yamaha

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Features Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life Wrist pin is nitride-coate d, providing a hardened, wear-resistant bearing surface Coated skirt ease break-in, decreasing wear and aiding in lubrication OE replacement with OE compression ratio Replacement rings are sold individually Wear-resistant piston rings Piston kit includes piston, rings, wrist pin and circlips Specs Product Name Piston Kit Style Cast Replica Piston Material Aluminum Alloy Skirt Coating Molybdenum Disulphite Piston Diameter 66.35 mm Compression Ratio Stock Cylinder Diameter 66.40 mm Displacement 250 cc Engine Type 2-Stroke Units Kit Riding Style Off-Road Fitments Position Notes 2016-2024 Yamaha YZ250X - - 1999-2024 Yamaha YZ250 - - Show more