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Namura Oversized Piston Kit for 1988-06 Yamaha YFS200 Blaster - 67.42mm - NA-40003-6 2011 Honda Rancher 420 ES EPS 4x4 W6583 - TopEnd Gasket KitNamura 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