Yamaha B4X-11630-00-00 - YZ125/YZ125X Piston Kit is a service part accessory that includes a piston, ring, circlips, and wrist pin for specified Yamaha motorcycle models.

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Key Features & Benefits

• Genuine Yamaha kit — piston, ring, circlips, and wrist pin included
• High-quality forged aluminum piston construction
• Proven OEM fitment, durability, and reliability
• Restores factory compression and throttle response
• Straightforward drop-in replacement during a top-end rebuild
• Matched components eliminate bore/clearance guesswork

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Fits These Yamaha Models

Yamaha Model	Compatible Years
YZ125	2022-2023
YZ125X	2023

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Frequently Asked Questions

What is Yamaha part B4X-11630-00-00?

B4X-11630-00-00 is the Yamaha YZ125/YZ125X Piston Kit, an accessory service part that includes piston components for select Yamaha motorcycles.

Is B4X-11630-00-00 a Yamaha accessory?

Yes, it is classified as a Yamaha accessory service part designed for specific Yamaha motorcycle models.

Which Yamaha models fit B4X-11630-00-00?

This piston kit fits Yamaha YZ125 models from 2005 to 2023 and YZ125X models from 2020 to 2023. Verify 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.