ProX Piston Kit for Yamaha YZ125, 53.95 mm (01.2224.B)

The PROX 01.2224.B Piston Kit is a precision-engineered OEM replacement solution for select Yamaha YZ125 applications. Manufactured in Japan, this kit is designed to restore reliable engine performance while meeting or exceeding original equipment specifications. It is suitable for riders, technicians, and powersports professionals seeking dependable replacement components from a trusted aftermarket brand.
The piston is cast from a high-silicon-content aluminum alloy to provide strength, durability, and consistent performance under demanding two-stroke operating conditions. Each piston is CNC-machined to extremely close tolerances, supporting accurate fitment and smooth engine operation when installed according to the motorcycle manufacturer’s service procedures. The PROX engineering process helps deliver the quality and precision expected from a professional-grade replacement piston.
This complete kit includes the piston, piston ring kit, wrist pin, and circlips for a convenient engine rebuild. Replacing these related components together can help simplify installation and ensure the piston assembly is properly matched. Always verify application compatibility and consult the appropriate service information before installation to confirm that the PROX 01.2224.B kit is correct for your Yamaha YZ125.

Features:

• Brand: PROX

• Part Number: 01.2224.B

• Application: Select Yamaha YZ125 models

• Manufacturing: Made in Japan

• Construction: Cast from high-silicon-content aluminum alloy

• Fit and Finish: CNC-machined to extremely close tolerances

• OEM Replacement: Meets or exceeds OEM specifications

• Kit Contents: Piston, ring kit, wrist pin, and circlips

• Piston Size: 53.95 mm

Ships from Parts Unlimited.