Yamaha B4X-W0001-00-00 - YZ125/YZ125X Top End Gasket Kit is an accessory kit containing gaskets, seals, and O-rings needed for reassembling YZ125 or YZ125X engines.

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Key Features & Benefits

• Genuine Yamaha Top End/Bottom End Gasket Kit — designed for convenience and total savings
• Includes the necessary gaskets, seals, and O-rings needed to reassemble the engine
• One part number covers everything needed for the rebuild, instead of sourcing gaskets individually
• Reliable sealing helps prevent oil, coolant, or compression leaks after reassembly

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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-W0001-00-00?

B4X-W0001-00-00 is the Yamaha YZ125/YZ125X Top End Gasket Kit, an accessory kit containing the gaskets, seals, and O-rings needed for engine reassembly.

What is Yamaha B4X-W0001-00-00 used for?

This gasket kit is used for reassembling the top end of YZ125 and YZ125X engines, providing the necessary seals and gaskets.

Which Yamaha models fit B4X-W0001-00-00?

This kit fits Yamaha YZ125 models from 2005 through 2027 and YZ125X models from 2020 through 2027. Confirm 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.