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

• High-performance aluminum cylinder with precision-machined intake and exhaust ports for optimized combustion efficiency

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

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

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

• Designed for seamless compatibility with OEM engine components

Specifications

• Bore Size: 54mm (Standard Bore)

• Cylinder Material: Aluminum with optimized porting

• Head Insert: Modular bronze design

• Piston Type: Lightweight, single-ring with Oil Dots

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

Cross-Reference OEM Part Numbers

• P400485100102

Vehicle Fitments

• Yamaha YZ 125 cc 2022–2025

• Yamaha YZ X 125 cc 2023–2025

• Fantic XX 2T 125 cc 2022–2025

• Fantic XE 2T 125 cc 2023–2024