The Athena Standard Bore Racing Cylinder Kit is engineered for high-performance applications in the Yamaha YZ 125 and compatible models. Designed to optimize engine power and thermal management, this 54mm full race kit includes a lightweight piston and modular cylinder head to elevate responsiveness and durability under competitive conditions.

Features

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  High-performance aluminium cylinder with precision-machined intake and exhaust ports for optimised combustion efficiency

  
  


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  Racing cylinder head featuring a modular bronze insert for superior heat dissipation and thermodynamic performance

  
  


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  Lightweight single-ring piston with Oil Dot technology for reduced friction and enhanced lubrication

  
  


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  Engineered for increased power output, throttle responsiveness, and mechanical reliability

  
  


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  Designed for seamless compatibility with OEM engine components

  
  

Specifications

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  Bore Size: 54mm (Standard Bore)

  
  


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  Cylinder Material: Aluminium with optimized porting

  
  


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  Head Insert: Modular bronze design

  
  


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  Piston Type: Lightweight, single-ring with Oil Dots

  
  


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  Kit Includes: Cylinder, head with insert, piston, and associated hardware

  
  

Cross-Reference OEM Part Numbers

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  P400485100102

  
  

Vehicle Fitments

• Fantic XE 2T 125cc  2023-2024


• Fantic XX 2T 125cc  2022-2025


• Yamaha YZ 125cc  2022-2026


• YAMAHA YZ X 125cc  2023-2026