The latest-generation Yamaha YZ 125 sets the benchmark in the 125cc segment, featuring a powerful engine, responsive chassis, and precise power management. To further enhance these characteristics, Athena introduces the new Standard Bore Racing Cylinder Kit, an advanced solution designed to optimize engine performance with race-proven components engineered for maximum power output.
High-Performance Cylinder
At the core of this kit is a high-performance aluminum cylinder, featuring precision-machined intake and exhaust ports for optimized gas flow and improved combustion efficiency. These modifications enhance power delivery, ensuring instant throttle response and increased performance across the entire RPM range. The advanced design minimizes turbulence, maximizing engine efficiency and thermal stability during high-intensity riding sessions.
Racing Head with Modular Bronze Insert
To ensure superior thermodynamic efficiency, the kit includes a racing head with a modular bronze insert, engineered for optimal heat dissipation and enhanced resistance to high temperatures. The combustion chamber geometry has been specifically designed to increase the velocity of the air-fuel mixture, resulting in smoother power delivery and improved reliability under extreme conditions.
Lightweight Single-Ring Piston with Oil Dots
The kit features a lightweight single-ring piston, designed to reduce reciprocating mass and improve engine responsiveness. The Oil Dot technology optimizes lubrication, reducing friction and extending component longevity. This results in smoother piston movement, improved mechanical efficiency, and enhanced power output with superior wear resistance.
The Athena Standard Bore Racing Cylinder Kit is the ultimate choice for riders seeking maximum performance from their Yamaha YZ 125 without compromise. Featuring cutting-edge design and high-quality materials, this kit provides a significant upgrade over stock components, ensuring smoother power delivery, increased horsepower, and enhanced durability under the most demanding conditions.
Confirm the exact year, make, model and trim before ordering. Send us SKU 227211 with your vehicle info and we can help verify fitment.
Shipping services and final delivery cost are shown at checkout. Returns are confirmed before an RMA is issued — parts generally need to be uninstalled, unused and in original packaging. Full policy.
