RELIABILITY AND PERFORMANCE WITHOUT COMPROMISE
Athena, a trusted name in the off-road motorcycle spare parts sector for over 50 years, presents its complete line of cylinder kits for Yamaha YZ 125 22/26 and YZ X 125 23/26. Three distinct solutions, developed by Athena’s Research & Development department, designed to deliver the perfect balance of reliability, fun and power to meet every rider’s needs. Each kit is rigorously tested both on the bench and on the track, demonstrating the quality and durability that set Athena apart.
Standard Bore Cylinder Kit – Ø 54 mm, 125 cc –
Compatible with Yamaha YZ 125 22/26, YZ X 125 23/26
Ideal for those seeking a direct replacement for the original part, this kit combines performance, simplicity and reliability. The cylinder is designed to ensure strength and durability, while bench and track tests have confirmed smooth and balanced delivery at all RPMs. The piston, developed with precision and attention to weight and balance, guarantees smooth operation and quick acceleration. Gaskets, designed to withstand heat and vibrations, preserve engine integrity. With the Standard Bore Kit, Athena reaffirms its commitment to combining engineering precision and practicality, making maintenance simple and safe.
Standard Bore Racing Cylinder Kit – Ø 54 mm, 125 cc –
Compatible with Yamaha YZ 125 22/26, YZ X 125 23/26
For those looking for more fun and performance without giving up the original displacement, this kit represents an evolution compared to standard and OEM parts. The racing cylinder, derived from the Standard Bore with reworked intake and exhaust ports, ensures more linear power delivery and quicker engine response. The lightweight single-ring flat-top piston with Oil Dots reduces friction and improves smoothness, enhancing reactivity. The modular head with bronze insert optimizes squish, compression, and heat dissipation, working in synergy with the piston. Racing exhaust valves, with evolved geometries, increase durability and overall performance. The kit, complete with all necessary gaskets, guarantees resistance to thermal and vibrational stress. With the Standard Bore Racing Kit, Athena offers a plug & play track-oriented solution: more performance, same displacement, as easy to install as a standard replacement.
Big Bore Cylinder Kit – Ø 58 mm, 144 cc –
Compatible with Yamaha YZ 125 22/26 and YZ X 125 23/26
The choice for riders who want maximum power. The Athena Big Bore 144 cc kit is the ideal solution for those who want to go beyond standard limits. The aluminum cylinder, a result of advanced engineering, is designed to optimize combustion and ensure durability even in the toughest riding conditions. The modular head, with aluminum shell and bronze dome, allows precise adjustment of squish and compression ratio, while also improving heat dissipation for long-lasting performance. Exhaust control valves in Ergal 7075, hard-anodized, ensure tight sealing, reliability and consistent power delivery. The piston, developed with focus on weight and balance, offers quick acceleration and smooth operation, while the Athena gasket set, tested to withstand thermal and mechanical stress, maintains engine integrity and functionality. With the Big Bore Kit, Athena provides professionals and demanding enthusiasts with a concentration of racing technology, capable of unlocking exceptional performance from the YZ 125 engine.
The cylinder kits are now available on the athena.eu online shop and are compatible with all 2026 applications. With this range, Athena reinforces its commitment to delivering complete and proven solutions, designed to meet the demands of both professionals and enthusiasts by combining reliability, performance, and innovation in every detail.
