Yamaha B4X-WB033-00-A0 - YZ125/YZ125X Piston Rebuilt Kits is a Yamaha accessory kit that includes all parts needed to rebuild the top end for select YZ125 and YZ125X motorcycles.

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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-A0?

B4X-WB033-00-A0 is the Yamaha YZ125/YZ125X Piston Rebuilt Kits, an accessory kit containing parts to rebuild the top end of select Yamaha motorcycles.

Is B4X-WB033-00-A0 a Yamaha accessory?

Yes, this product is classified as a Yamaha accessory designed for service and maintenance purposes.

Which Yamaha models fit B4X-WB033-00-A0?

This kit fits the YZ125 models from 2022 to 2027 and the YZ125X models from 2023 to 2027. Confirm the exact SKU and model year 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.