Features: All piston skirts are coated with a hi-tech Molybdenum Disulphite coating for faster break-in time and increased piston life Cast Replica piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston Forged Replica pistons are forged from 2618 aluminum for superior strength and durability Forged High Compression pistons improve power and torque across entire rpm range Forged Big Bore pistons increase engine*s displacement, torque, and peak horsepower Forged Replica pistons are forged OE replacements All pistons are heat treated with a T-5 hardening and tempering cycle Replica pistons and all rings are OEM replacements Kits include piston, rings, wrist pin and circlips Two stroke replacement rings are sold individually (Example if your piston has two rings you will want to order two rings) Four-stroke piston rings sold as a set Designed To Fit: 2005 Yamaha YZ125 2006 Yamaha YZ125 2007 Yamaha YZ125 2008 Yamaha YZ125 2009 Yamaha YZ125 2010 Yamaha YZ125 2011 Yamaha YZ125 2012 Yamaha YZ125 2013 Yamaha YZ125 2014 Yamaha YZ125 2015 Yamaha YZ125 2016 Yamaha YZ125 2017 Yamaha YZ125 2018 Yamaha YZ125 2019 Yamaha YZ125 2020 Yamaha YZ125 2020 Yamaha YZ125X 2021 Yamaha YZ125 2021 Yamaha YZ125X 2022 Yamaha YZ125X 2023 Yamaha YZ125X 2024 Yamaha YZ125XManufacturer Part Number: 24444B