Wiseco Yamaha YZ125 05-19 ProLite 2126CS Piston Kit

The Pro-Lite series is Wiseco's staple forged 2-stroke piston, offering great value for reliable all-purpose riding. These pistons are designed for both track and trail, providing refreshed performance with every ride. Pro-Lite pistons feature optimized forging for strength and extra lightning operations for enhanced throttle response. This all-purpose piston is perfect for riders seeking a balance of performance and reliability. 54.00 mm Bore

• Dedicated forging design for strength-to-weight optimization
• Extra lightening operations for enhanced throttle response
• High-quality ring(s), wrist pin(s), and circlips included
• Engineered, forged, and machined in the USA in Mentor, OH
• Refreshed performance from the track to the trail
• Designed for all-purpose 2-stroke riding
• Great value for reliable fun factor

Refresh the performance of your Yamaha YZ125 with the Wiseco Pro-Lite forged 2-stroke piston kit, part 845M05400. Built for dependable track and trail use, this piston delivers a practical balance of strength, responsive throttle feel, and everyday durability. Its 54.00 mm bore is designed for compatible YZ125 applications and provides a reliable replacement option for riders seeking renewed engine performance.
The Wiseco Pro-Lite piston uses a dedicated forging design optimized for strength-to-weight performance. Additional lightening operations help reduce reciprocating weight and promote enhanced throttle response, making it well suited to all-purpose 2-stroke riding. This kit is engineered for riders who want reliable fun and refreshed performance without sacrificing the durability expected from a forged piston.
The kit includes high-quality piston ring(s), wrist pin(s), and circlips for a complete installation solution. Wiseco engineers, forges, and machines its pistons in the USA in Mentor, Ohio, supporting consistent manufacturing quality and dependable fitment. This product is intended for powersports applications and is not CARB approved; verify local emissions requirements before installation or use.
Compatible with 2005-2014 Yamaha YZ125 models, this Wiseco Pro-Lite piston kit is a suitable choice for maintenance, rebuild, or performance restoration. Always confirm engine specifications, service limits, and installation clearances against the vehicle service manual before assembly.

Features:

• 54.00 mm bore for compatible Yamaha YZ125 applications

• Dedicated forging design optimized for strength-to-weight performance

• Additional lightening operations for enhanced throttle response

• High-quality piston ring(s), wrist pin(s), and circlips included

• Engineered, forged, and machined in the USA in Mentor, Ohio

• Designed for dependable all-purpose 2-stroke riding

• Suitable for refreshed performance from the track to the trail

• Fits 2005-2014 Yamaha YZ125 models

Fitment:
Yamaha YZ125 Base 2005
Yamaha YZ125 Base 2006
Yamaha YZ125 Base 2007
Yamaha YZ125 Base 2008
Yamaha YZ125 Base 2009
Yamaha YZ125 Base 2010
Yamaha YZ125 Base 2011
Yamaha YZ125 Base 2012
Yamaha YZ125 Base 2013
Yamaha YZ125 Base 2014
Yamaha YZ125 Base 2015
Yamaha YZ125 Base 2016
Yamaha YZ125 Base 2017
Yamaha YZ125 Base 2018
Yamaha YZ125 Base 2019
Yamaha YZ125 Base 2020
Yamaha YZ125 Base 2021
Yamaha YZ125X Base 2020
Yamaha YZ125X Base 2021
Yamaha YZ125X Base 2022