ProX Piston Kit for Yamaha YZ125 and YZ125X (01.2225.A)

The PROX 01.2225.A Piston Kit is designed as an OEM replacement for select Yamaha YZ125 and YZ125X two-stroke applications. Manufactured in Japan, this piston kit provides a reliable replacement solution for rebuilding the top end while maintaining the fit and performance standards expected from a precision-engineered component.
Cast from a high-silicon-content aluminum alloy, the piston is built to meet or exceed OEM specifications for strength, durability, and thermal stability. Its material construction helps support consistent operation in demanding riding conditions, while the piston profile is engineered for compatibility with the specified Yamaha engine applications.
Each PROX piston is CNC-machined to extremely close tolerances for accurate fitment and dependable performance. The kit includes the piston, piston ring kit, wrist pin, and circlips, providing the essential components needed for installation. With its application-specific design, the PROX 01.2225.A helps simplify top-end service and supports proper component matching during engine maintenance.
Before installation, verify the application, model year, and required piston clearance according to the motorcycle manufacturer’s service specifications. Professional installation and correct measurement procedures are recommended to help ensure reliable operation and long service life.

Features:

• Manufactured in Japan for consistent quality and precision

• Designed as an OEM replacement for Yamaha YZ125 and YZ125X applications

• Cast from a high-silicon-content aluminum alloy

• Meets or exceeds OEM specifications

• CNC-machined to extremely close tolerances

• Kit includes piston, ring kit, wrist pin, and circlips

Ships from Parts Unlimited.