Athena 54.00 mm Cylinder Kit for Kawasaki KX125 (P400250100001)

Upgrade the top end of your Kawasaki KX125 with the Athena P400250100001 Cylinder Kit, engineered for high-performance applications and dependable power delivery. This complete kit includes an aluminum cylinder with a nickel-carbide coating and larger water jackets to support efficient cooling during demanding riding. The bolt-on design simplifies installation, with no matching required except where specifically noted.
The kit includes a high-performance, hard-anodized power valve designed by Athena. This power valve is specially engineered for the kit and cannot be used with the original equipment manufacturer power valve. An aluminum cylinder head with a removable bronze dome is also included, providing support for higher compression ratios and anti-detonation performance except where noted for specific applications.
Athena includes a Cast-Lite flat-top piston kit along with a complete top-end gasket set. The gasket set contains the required seals and hardware for installation, helping provide a convenient solution for rebuilding or upgrading the engine’s top end. The 54.00 mm cylinder specification is designed for compatible Kawasaki KX125 applications; verify fitment and any application-specific requirements before installation.
Built for riders and technicians seeking a comprehensive performance replacement, the Athena P400250100001 Cylinder Kit combines the cylinder, head, piston, power valve, gaskets, seals, and hardware in one package. Follow the manufacturer’s installation instructions and confirm all noted exceptions before assembly to ensure proper operation and long-term reliability.

Features:

• Aluminum cylinder with nickel-carbide coating for durability and performance

• Larger water jackets support efficient engine cooling

• High-performance hard-anodized power valve included; not compatible with the OEM power valve

• Aluminum cylinder head with removable bronze dome

• Supports higher compression ratios and anti-detonation features where applicable

• Cast-Lite flat-top piston kit included

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

• Bolt-on installation with no matching required except where noted

• 54.00 mm cylinder specification

• Designed for compatible Kawasaki KX125 applications

Ships from Parts Unlimited.