Vertex 23403B Piston Kit for 478cc Big Bore Engines - 3.00mm Oversize (97.96mm) with 11.4:1 Compression Ratio | High Performance Upgrade for ATV, Dirt Bike & Motorcycle Engine Rebuilds

Bore: 97.96mmCompression: 11.4:1 CompressionSizing: 3.00mm OversizeAll pistons are heat treated with a T-5 hardening and tempering cycle. All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life. Cast piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston. Forged pistons are forged from 2618 aluminum for superior strength and durability. Forged High Compression pistons improve power and torque across entire rpm range. Big Bore pistons increase engines displacement, torque, and peak horsepower. Forged Replica pistons are forged OE replacements. Replica pistons and all rings are OEM replacements.This item fits the following vehicle applications:compatible with Yamaha YFZ450 2012-2013compatible with Yamaha YFZ450 2004-2009compatible with Yamaha YFZ450 Bill Balance Edition 2006-2007compatible with Yamaha YFZ450 SE 2007-2008compatible with Yamaha YFZ450R 2009-2014compatible with Yamaha YFZ450R SE 2009-2014compatible with Yamaha YFZ450X 2010-2011compatible with Yamaha YFZ450X Bill Balance 2010compatible with Yamaha YFZ450X SE 2011