Namura Technologies NA-40015-4K Piston Kit 71.95mm 1.00mm Oversize Yamaha YFM250

The Namura Technologies NA-40015-4K is a complete top end piston kit designed for Yamaha 250cc ATV models. This oversize piston kit features advanced coating and manufacturing technologies to deliver superior performance and durability.

Complete Kit Includes:

• Piston with MOS2 coated skirts
• Piston rings
• Wrist pin and circlips
• Top end bearing
• Complete gasket kit

Advanced Features:

• MOS2 Teflon/Molybdenum Coated Skirts: Rolled-on application creates a bond 10 times stronger than spray-on coatings, increasing heat transfer, reducing friction, and eliminating cold seizures
• Machined Smooth Head: Reflects combustion heat and reduces carbon buildup while potentially increasing horsepower and fuel economy by up to 6%
• Anodized Dome: Provides 75% greater strength than non-anodized pistons with increased heat resistance and durability
• Hypereutectic Casting Process: Higher silicon content reduces expansion rates, increases wear resistance, and withstands higher cylinder temperatures

Specifications:

• Bore: 71.95mm
• Sizing: 1.00mm Oversize
• Compression Ratio: 8.7:1

This piston kit is specifically designed for rebuilding or upgrading Yamaha YFM250 Big Bear, Bruin, Bear Tracker, and YFB250 Timberwolf models that require a 1.00mm oversize piston.