Athena 54 mm Cylinder Kit for Yamaha YZ125 (P400485100029)

Upgrade the top-end performance of your Yamaha YZ125 with the Athena P400485100029 Cylinder Kit. Designed for high-performance applications, this kit combines an aluminum cylinder with a durable nickel carbide coating and an aluminum cylinder head fitted with a removable bronze dome. The construction supports consistent performance, effective heat management, and dependable durability under demanding riding conditions.
The kit includes specially designed, high-performance hard-anodized power valves engineered specifically for this Athena cylinder system. These power valves cannot be used with the original equipment manufacturer cylinder, making this kit a complete solution for replacing and upgrading the related top-end components. The included cast lightweight flat-top piston is supplied with piston rings, clips, and wrist pin for a straightforward installation.
Athena also includes a complete top-end gasket set with the required seals and hardware. This helps simplify installation and ensures the replacement components work together as intended. The 54 mm cylinder configuration is developed for the Yamaha YZ125 and is suitable for riders seeking reliable, performance-focused top-end components from a recognized powersports manufacturer. Verify model-year compatibility and installation requirements before ordering.

Features:

• Aluminum cylinder with durable nickel carbide coating

• Aluminum cylinder head with removable bronze dome

• Specially designed hard-anodized high-performance power valves

• Power valves are not compatible with the OEM cylinder

• Cast lightweight flat-top piston

• Includes piston rings, clips, and wrist pin

• Athena top-end gasket set with required seals and hardware

• 54 mm cylinder configuration for Yamaha YZ125 applications

Ships from Parts Unlimited.