COMPLETE TOP END PISTON KIT W/ GASKETS FOR 2005-2021 YAMAHA YZ125 YZ 125

Complete Top End Piston Kit for Yamaha YZ125

This complete top end piston kit with gaskets restores compression and power on 2005-2021 Yamaha YZ125 machines, giving you every gasket and piston component needed for a full top end refresh.

Overview

This complete top end piston kit for Yamaha YZ125 provides the piston, rings, wrist pin, and gasket set needed to rebuild the upper cylinder after wear or a seizure. It is built for riders and mechanics tackling a routine top end service on 2005-2021 YZ125 models. Everything in this top end piston kit is sized for a direct fit so the rebuild stays simple.

Built For Performance

• Complete kit includes piston, rings, wrist pin, and clip set
• Full gasket set covers base, head, and related seals
• Piston machined for the YZ125 bore and stroke
• Ring set sized to match the piston for proper sealing
• Components grouped for a single top end rebuild

Fits These Machines

• for Yamaha YZ125 2005
• for Yamaha YZ125 2006
• for Yamaha YZ125 2007
• for Yamaha YZ125 2008
• for Yamaha YZ125 2009
• for Yamaha YZ125 2010
• for Yamaha YZ125 2011
• for Yamaha YZ125 2012
• for Yamaha YZ125 2013
• for Yamaha YZ125 2014
• for Yamaha YZ125 2015
• for Yamaha YZ125 2016
• for Yamaha YZ125 2017
• for Yamaha YZ125 2018
• for Yamaha YZ125 2019
• for Yamaha YZ125 2020
• for Yamaha YZ125 2021

On-The-Job Use

• Routine top end service on a YZ125 motocross bike
• Rebuilding after a piston seizure or loss of compression
• Race season refresh before a rebuild interval
• Trail and track machines needing a compression restore

Specs At A Glance

Good To Know

Q: Does this kit include every gasket needed for the rebuild? A: The kit is sold as a complete top end package with the gasket set alongside the piston components. Confirm the listing contents against your machine before ordering.

Q: Do I need to check piston size before buying? A: Yes, piston size and cylinder condition must match the YZ125 bore for a proper fit. Verify your current bore size and any overbore before purchase.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.