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Namura Piston Kit for 1987-06 Yamaha YFZ350 Banshee - 64.45mm - NA-40001-2 2009 Yamaha Raptor 700 2009 Arctic Cat 700 AutoNamura Technologies Piston Kit Part Number: NA 40001 2 Piston Size: 64. 45mm 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 increases wear resistance. Machined Smooth Heads Reflect combustion heat and reduces carbon buildup. Namura piston kits come with the piston, a set of OEM quality