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: 2002 Yamaha YZ85 2003 Yamaha YZ85 2004 Yamaha YZ85 2005 Yamaha YZ85 2006 Yamaha YZ85 2007 Yamaha YZ85 2008 Yamaha YZ85 2009 Yamaha YZ85 2010 Yamaha YZ85 2011 Yamaha YZ85 2012 Yamaha YZ85 2013 Yamaha YZ85 2014 Yamaha YZ85 2015 Yamaha YZ85 2016 Yamaha YZ85 2017 Yamaha YZ85 2018 Yamaha YZ85 2019 Yamaha YZ85 2020 Yamaha YZ85 2021 Yamaha YZ85 2022 Yamaha YZ85 2023 Yamaha YZ85 2024 Yamaha YZ85Manufacturer Part Number: 24370B