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Namura Piston Kit for 1993-25 Yamaha YZ80/YZ85 - Bored to 47.46mm -Namura-NX-40080-2C 2008 Polaris Sportsman 500 H.O. 4x4 LE EFI 2012 Polaris Sportsman 850 TouringNamura Technologies Piston Kit Namura gives you a higher performance piston without the higher price MOS2 Coated Skirts increase heat transfer and reduce friction to eliminate cold seizures. Higher silicon content reduces expansion rates and increaseswear resistance. Machined Smooth Heads Reflect combustion heat and reduces carbon buildup. Namura piston kits come with the piston, a set of OEM quality rings, a wrist pin, and circlips. Why replace your