Yamaha B4X-WB033-00-D0 - YZ125/YZ125X Piston Rebuilt Kits is a Yamaha accessory kit that includes all parts needed to rebuild the top end of select YZ125 and YZ125X models.

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Key Features & Benefits

• Genuine Yamaha forged aluminum piston for strength and heat resistance
• Complete top-end rebuild kit — piston, ring, wrist pin, circlips, gaskets, seals, and O-rings in one package
• Proven OEM fitment tested to Yamaha's durability and reliability standards
• One-stop rebuild — no separate sourcing of gaskets, seals, or small hardware
• Restores compression and power output to like-new levels
• Convenience and cost savings versus buying individual top-end components separately

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Fits These Yamaha Models

Yamaha Model	Compatible Years
YZ125	2022-2027
YZ125X	2023-2027

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Frequently Asked Questions

What is Yamaha part B4X-WB033-00-D0?

B4X-WB033-00-D0 is the Yamaha YZ125/YZ125X Piston Rebuilt Kits, an accessory kit to rebuild the top end of select Yamaha motocross models.

What type of Yamaha part is B4X-WB033-00-D0?

It is an accessory kit categorized as service parts for maintenance and repair tasks.

Which Yamaha models fit B4X-WB033-00-D0?

This kit fits the YZ125 and YZ125X models covering years from 2011 and 2021 through 2027. Confirm exact model and year compatibility before ordering.

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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.